CA1279459C - Exterior insulating sheathing - Google Patents
Exterior insulating sheathingInfo
- Publication number
- CA1279459C CA1279459C CA 534090 CA534090A CA1279459C CA 1279459 C CA1279459 C CA 1279459C CA 534090 CA534090 CA 534090 CA 534090 A CA534090 A CA 534090A CA 1279459 C CA1279459 C CA 1279459C
- Authority
- CA
- Canada
- Prior art keywords
- ply
- sheathing
- polystyrene
- lbs
- fiberboard
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 239000004793 Polystyrene Substances 0.000 claims abstract description 23
- 239000011094 fiberboard Substances 0.000 claims abstract description 21
- 229920002223 polystyrene Polymers 0.000 claims abstract description 20
- 239000006260 foam Substances 0.000 claims abstract description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 12
- 230000005540 biological transmission Effects 0.000 claims abstract description 7
- 239000003292 glue Substances 0.000 claims description 11
- 239000010426 asphalt Substances 0.000 claims description 8
- 239000011248 coating agent Substances 0.000 claims description 2
- 238000000576 coating method Methods 0.000 claims description 2
- 229920006327 polystyrene foam Polymers 0.000 description 8
- 239000003365 glass fiber Substances 0.000 description 6
- 239000002131 composite material Substances 0.000 description 4
- 239000004794 expanded polystyrene Substances 0.000 description 4
- 239000002023 wood Substances 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N phenol group Chemical group C1(=CC=CC=C1)O ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 235000014466 Douglas bleu Nutrition 0.000 description 1
- 241000218657 Picea Species 0.000 description 1
- 235000005018 Pinus echinata Nutrition 0.000 description 1
- 241001236219 Pinus echinata Species 0.000 description 1
- 235000017339 Pinus palustris Nutrition 0.000 description 1
- 241000218683 Pseudotsuga Species 0.000 description 1
- 235000005386 Pseudotsuga menziesii var menziesii Nutrition 0.000 description 1
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000001143 conditioned effect Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000010440 gypsum Substances 0.000 description 1
- 229910052602 gypsum Inorganic materials 0.000 description 1
- 239000012943 hotmelt Substances 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 229920000582 polyisocyanurate Polymers 0.000 description 1
- 239000011495 polyisocyanurate Substances 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000007655 standard test method Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
- B32B5/18—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by features of a layer of foamed material
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/62—Insulation or other protection; Elements or use of specified material therefor
- E04B1/74—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls
- E04B1/76—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls specifically with respect to heat only
- E04B1/762—Exterior insulation of exterior walls
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Acoustics & Sound (AREA)
- Electromagnetism (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Laminated Bodies (AREA)
Abstract
EXTERIOR INSULATING SHEATHING
ABSTRACT
An exterior insulating sheathing which comprises a foam polystyrene ply and a second ply glued to said polystyrene ply throughout. The second ply is preferably a fiberboard but may also be a waferboard. The sheathing is nailable, has a racking load of about 1900 to 3700 lbs, and has at least the exposed side of the second ply water resistant.
This sheathing has a minimum tensile strength of 65 ? 14 kPa, a linear expansion at 97% RH and 23°C, of less than 0.40% ? .02, a water vapour transmission of at least 96ng.Pa.s.m2, and a modulus of rupture of 0.5 to 17.2 megaPascal.
ABSTRACT
An exterior insulating sheathing which comprises a foam polystyrene ply and a second ply glued to said polystyrene ply throughout. The second ply is preferably a fiberboard but may also be a waferboard. The sheathing is nailable, has a racking load of about 1900 to 3700 lbs, and has at least the exposed side of the second ply water resistant.
This sheathing has a minimum tensile strength of 65 ? 14 kPa, a linear expansion at 97% RH and 23°C, of less than 0.40% ? .02, a water vapour transmission of at least 96ng.Pa.s.m2, and a modulus of rupture of 0.5 to 17.2 megaPascal.
Description
~794S9 This invention relates to an exterior insulating sheathing and more particularly to a composite product having improved structural strength, and other improved properties o~er the present existing insulating sheathings as will be discussed hereinafter.
BACKGROUND OF THE INVENTIGN
There are several kinds of exterior insulating sheath-ings existing: Polystyrene, polyurethane, polyisocyanurate, glass fiber, and phenolic sheathings are known and used.
These are normally 4 feet wide by 8 feet long or 4 x 9, and occasionally 2 feet by 8 feet. However, these do not possess the rigidity one would wish them to have. --In house construction, generally walls are built on the floor: The beams are laid down and khe sheathing fixed to them, after which the wall is lifted to an upright position: In Canada, walls that are constructed on the floor and then upxaised, is termed platform construction.
~he insulating sheathings are normally 4 feet by 8 ~eet. In order to fix the insulating sheathing one has to walk on the 2" x 6" or 2" x 4" beams, or beams having other size, sometimes walking on the sheathing itself. Such walking on the sheathing often results in its perforation due to its weakness. Another problem associated with some sheathings is their tendency to warp, yielding a surface which is not flat, in particular the glass fiber one. In such cases, new sheathing must replace the old one. Because sheathings of glass fiber and foam have low strength, braces have also to be put; this is an additional expense and adds to costs.
Also, there is no composite materials having exterior insulating sheathing that exist. The composite materials .
.
: , :
~ 79~
that are known, are generally spot glued.
THE INVENTION
Applicant is now providing a sheathing which overcomes part of, or all of the above mentioned drawbac~s. Broadly stated, the invention is directed to an exterior insulating sheathing comprising a foam polystyrene ply and a second ply which is preferably a fiberboard ply or may also be a wafer board, said second ply being glued to said polystyrene ply throughout with a continuous layer of glue, so that said continuous layer of glue is sandwiched between said foam polystyrene ply and said second ply has to continuously fasten said polystyrene ply to said second ply, to form a unitary product defining a sheathing, said sheathing having the exposed side of said second ply board water resistant, said sheathing being nailable and having a racking minimum load according to the ASTM E~72 of 1900 to 3700 lbs, a minimum tensile strength of 65 + 14 kPa, a linear expansion at 97~ relative humidity (RH) and 23C, of less than 0.40%
+ .02, and a minimum water vapour transmission of 96 at least nonagram per second per meter s~uare (ng/Pa.s.m2) and a modulus of rupture of 0.5 to 17.2 megaPascal (mPa).
BRIEF DESCRIPTION OF THE DRAWINGS
Further features, objects and advantages will be evident following detailed description of the preferred embodiments of the present invention taken in conjunction with the accompanying drawings, in which:
Figure l is an exploded view illustrating one form of a sheathing as obtained in a particular embodiment of the present invention and position in a wall for better under-30 standing.
.
` ~ Z~9~5~3 Figure 2 is a top view along line 2-2 of Figure 1.
Figure 3 is a segmented view illustrating another embodiment of the invention.
DESCRIPTION OF THE PREFERRED EMBODIMENT
As shown in Figures 1 and 2, the sheating 10, comprises a ply of polystyrene foam 12, and a ply of fibre board 14, glued throughout onto said polystyrene foam 12. Preferably, the polystyrene foam 12 i5 good quality of expanded and extruded polystyrene (such expanded polystyrene for instance is obtained by steam expansion of polystyrene marbles). ~or example, such a polystyrene may have a density of: 0.6 to 1.5 lb/ft3, and has a thickness of normally 1.5 inch although it may vary within a thickness of 1.5 ~ 1 inch, with the foam density according to the intended use.
The fiberboard ply 14 is normally in the order of about half an inch or 7/16 of an inch, it is generally a fiberboard which is asphalt coated on one side, as shown at 14a, said coated side to be the exterior side of the sheathing 10. If desired, in order to obtain water resistance of the exposed side of the second ply of the sheathing, instead of a fiberboard which is asphalt coated, an asphalt impregnated flberboard may be used.
The fiberboard ply 14 and the polystyrene foam ply 12 -~
have a continuous layer of glue 16 sandwiched in between, to form a good unitary product. Although the layer 16 may be hot melt glue, it is preferable to use a glue such as vinyl acetate glue or other like glue compatible with the foam layer 12 and the fiberboard layer 14. The glue 16 has to be spread throughout the common surface adjacent the poly-styrene foam ply 12 and the fiberboard ply 14. It is . : , ' ' ~ . ' ' ~ .
1 ~79~59 preferable to lay the fiberboard ply 14 in stagger relationship on the polystyrene ply 12 as to obtain a ship lap and thereby preventing a thermal bridge as shown at 18 and 20.
In accordance with my invention, it is also preferable to produce these sheathing 10 in size 2" x 4' x 9'. In mak-ing a wall, for instance, the exterior insulating sheathing 10 is nailed to the beams with polystyrene ply 12 facing the beams (such as 2" x 6" or 2" x 4") which are laid on a floor. During this operation, a person of normal weight can walk over the sheathing 10 without occurance of breaking the polystyrene ply 12: the fiberboard 14 enabling a greater weight distribution over the polystyrene layer 12. Also, generally it has been found that the present insulating sheathing 10 when affixed to the beams eliminates need for bracing, said sheathing 10 having sufficient structural stren~th to hold the beams. Yet sheathing 10 is very easily cuttable, and it was found to have excellent dimensional stability aside from having good insulating characteristics. Once fixed on the 2" x 6" or 2" x 4", the wall is put on its upward position, the exterior o~ the sheathing 10 which is the fiberboard ply 14 coated with asphalt 14a is able to receive on it a finish 30, for instance clad boards such as vinyl or aluminum type which may be nailed through the sheathing 10 onto the beams.
From the interior in succession are added, for instance, the glass fibre 40 in between the spacing created by the beams 42, a air/vapor barrier 44 held in place by strapping 46, and then the gypsum wall panel as shown in Figures 1 and 2 next to strapping 46.
.
~- ~
79~5~3 Since the wall panels are generally 4' x 8', the 4' x 9' sheathing panels allow an overhand beyond the wall to cover the floor spacing 50-52. Also, as is easily seen the present invention allows for a gain 54 in the floor surface area over the prior art that requires the insulating shea-thing 10 to rest on the floor instead in accordance with present invention said sheathing 10 is secured on beam 42.
As seen in Figure 3, the polystyrene foam ply 12 is fastened by glue 16 to a waferboard 14b which is generally self-1~ containing a wax coating as is illustrated by means of 14a.
Such a sheathing has generally a minimum tensile strength of about 65 ~ 14 kPa, a linear expansion at 97% RH
and 23C of less than 0.40% + .02, and a minumum ~ater vapour transmission of 96 nonagrams per second per meter s~uare (ng/Pa.S.m2) a modulus of rupture of 0.5 to 17.2 megaPascal tmPa). When fiberboard is used, the minimum rac~ing load is of the order of 2100 ~ 200 lbs and the modulus of rupture is of the order of 0.6 + .1 megaPascal.
When a wafer board is used, the minimum racking load is more of the order of 2300 + 300 lbs for a ply having a thickness of 3/8" to 1/4" and 3500 ~ 200 for a ply of o.5 inch in thickness and the modulus of rupture is 16.2 + 1 megaPascal.
The following will serve onl~ to illustrate particular embodiments of the invention and to compare some of these embodiments over the prior art.
An insulating sheathing was made using a 0.5 inch fiber-board asphalt coated on one side, glued to a polystyrene foam having a density of 1 lb/ft3 and a thickness of 1.5":
the R value was determined and found to be 6.85. This was 3. ~794S9 compared against the following existing insulating sheathing where R is shown:
Applicant's product - 1.5" 6.7 EscladTM Phenolic foam - 1.1" 6.0 GlascladTM glass fibre 1" 4.4 GlascladT~ glass fibre 1~" 6.7 Six insulating sheathing panels were made as in Example 1. The sheathing panels were a composite board of fiber-board 7/16'i thick and expanded polystyrene 1-7/16" thick, measuring nominally 4' x 9'. A racking load evaluation of the six (6) sheathing panels was made.
Three standard wood frames were built in accordance to ASTM Standard ~-72, Section 14, each frame accomodating 2 sheathing panels. Stud grade spruce wood was used instead o~ the southern pine or douglas fir required by the Standard.
Sheathin~ panels were fastened with 3" spiral wood nails having a square plastic "washer" measuring lxl". The nails were located at 6" intervals along the perimeter of the frame assembly and at 4 of the intermediate studs.
Inside corner studs were not used to fasten the panels.
The mix-stud where the sheathing panels butt joint with approximately 1/2" fiberboard overlap on the polystyrene, nails were placed on both sheathing panels at varying angles between 15 to 30 degrees from ~he vertical at 6" intervals.
A hydraulic ~ack with a nominal capacity of lO,OO0 lb was used to apply the load. A Moog 5ervo controller and load cell feedback system controlled the applied load which was read in a Daytronic Model 9005 Strain Gage Transducer 1 ~7945~3 :
Conditioner/Indicator with a resolution of 5 lb.
Racking loads were applied at intervals varying between 50 and 250 lbs. Readings were taken immediately after reaching each load level. Dial Gages #1 and #2 were removed when damage was possible. The test results are shown in Tables 1, 2 and 3.
Frame Nool Dial Gage Readiny Load, lbs.
Inches #1 #2 #3 O O O O
.115 0 .20 50 .310 .002 .67 100 .420 .047 1.10 150 1.53 400 1.77 500 2.05 600 2.16 700 2.68 850 3.07 1000 5.27 1800 (Maximum racking load recorded)2220 Frame No:2 Dial Gage Reading Load, Lbs Inches #1 #2 #3 O O O O
.468 .028 .67 260 30.476 .038 1.10 500 .632 .051 2.36 860 .688 .058 3.03 1000 4.57 1500 6.14 1800 7.12 1940 (Maximum racking loard) 2100 1 ~7945~
g Frame No:3 Dial Gage ReadingLoad, Lbs Inches #1 #2 #3 S O O o o .130 .015 .27 100 .235 .058 .55 200 .360 .228 1.26 400 .408 .243 1.61 500 10.445 .253 2.00 600 .492 .263 2.44 700 .525 .268 2.71 800 .555 .273 3.11 900 .585 .277 3.38 1000 15.610 .279 3.70 1100 .631 .281 3.97 1200 .660 .284 4.33 1300 5.00 1550 5.31 1600 5.75 1700 6.22 1800 (Maximum racking load) 2000 .
EX~MPLE 3 1. INTRODUCTION
A sample sheathing panel was made as in Example 1. The panel had a first ~12 mm (1/2") bitumen coated fibre board ply and a ~37 mm (1-1/2") expanded polystyrene insulation board, and nominal dimensions of 1220 x 2743 x 50 mm (48" x 108" x 2"). The following tests were made:
1) Weight per unit area 2) Tensile strength (ASTM D1623) - perpendicular 3) Racking load (ASTM) E73 Sect. 14) 4) ~inear expan~ion (ASTM D1037) 5) Water vapour transmission (ASTM E96) 6) Water absorption (ASTM D2842) - after 2 and 24 hrs under 50 mm of H2O
BACKGROUND OF THE INVENTIGN
There are several kinds of exterior insulating sheath-ings existing: Polystyrene, polyurethane, polyisocyanurate, glass fiber, and phenolic sheathings are known and used.
These are normally 4 feet wide by 8 feet long or 4 x 9, and occasionally 2 feet by 8 feet. However, these do not possess the rigidity one would wish them to have. --In house construction, generally walls are built on the floor: The beams are laid down and khe sheathing fixed to them, after which the wall is lifted to an upright position: In Canada, walls that are constructed on the floor and then upxaised, is termed platform construction.
~he insulating sheathings are normally 4 feet by 8 ~eet. In order to fix the insulating sheathing one has to walk on the 2" x 6" or 2" x 4" beams, or beams having other size, sometimes walking on the sheathing itself. Such walking on the sheathing often results in its perforation due to its weakness. Another problem associated with some sheathings is their tendency to warp, yielding a surface which is not flat, in particular the glass fiber one. In such cases, new sheathing must replace the old one. Because sheathings of glass fiber and foam have low strength, braces have also to be put; this is an additional expense and adds to costs.
Also, there is no composite materials having exterior insulating sheathing that exist. The composite materials .
.
: , :
~ 79~
that are known, are generally spot glued.
THE INVENTION
Applicant is now providing a sheathing which overcomes part of, or all of the above mentioned drawbac~s. Broadly stated, the invention is directed to an exterior insulating sheathing comprising a foam polystyrene ply and a second ply which is preferably a fiberboard ply or may also be a wafer board, said second ply being glued to said polystyrene ply throughout with a continuous layer of glue, so that said continuous layer of glue is sandwiched between said foam polystyrene ply and said second ply has to continuously fasten said polystyrene ply to said second ply, to form a unitary product defining a sheathing, said sheathing having the exposed side of said second ply board water resistant, said sheathing being nailable and having a racking minimum load according to the ASTM E~72 of 1900 to 3700 lbs, a minimum tensile strength of 65 + 14 kPa, a linear expansion at 97~ relative humidity (RH) and 23C, of less than 0.40%
+ .02, and a minimum water vapour transmission of 96 at least nonagram per second per meter s~uare (ng/Pa.s.m2) and a modulus of rupture of 0.5 to 17.2 megaPascal (mPa).
BRIEF DESCRIPTION OF THE DRAWINGS
Further features, objects and advantages will be evident following detailed description of the preferred embodiments of the present invention taken in conjunction with the accompanying drawings, in which:
Figure l is an exploded view illustrating one form of a sheathing as obtained in a particular embodiment of the present invention and position in a wall for better under-30 standing.
.
` ~ Z~9~5~3 Figure 2 is a top view along line 2-2 of Figure 1.
Figure 3 is a segmented view illustrating another embodiment of the invention.
DESCRIPTION OF THE PREFERRED EMBODIMENT
As shown in Figures 1 and 2, the sheating 10, comprises a ply of polystyrene foam 12, and a ply of fibre board 14, glued throughout onto said polystyrene foam 12. Preferably, the polystyrene foam 12 i5 good quality of expanded and extruded polystyrene (such expanded polystyrene for instance is obtained by steam expansion of polystyrene marbles). ~or example, such a polystyrene may have a density of: 0.6 to 1.5 lb/ft3, and has a thickness of normally 1.5 inch although it may vary within a thickness of 1.5 ~ 1 inch, with the foam density according to the intended use.
The fiberboard ply 14 is normally in the order of about half an inch or 7/16 of an inch, it is generally a fiberboard which is asphalt coated on one side, as shown at 14a, said coated side to be the exterior side of the sheathing 10. If desired, in order to obtain water resistance of the exposed side of the second ply of the sheathing, instead of a fiberboard which is asphalt coated, an asphalt impregnated flberboard may be used.
The fiberboard ply 14 and the polystyrene foam ply 12 -~
have a continuous layer of glue 16 sandwiched in between, to form a good unitary product. Although the layer 16 may be hot melt glue, it is preferable to use a glue such as vinyl acetate glue or other like glue compatible with the foam layer 12 and the fiberboard layer 14. The glue 16 has to be spread throughout the common surface adjacent the poly-styrene foam ply 12 and the fiberboard ply 14. It is . : , ' ' ~ . ' ' ~ .
1 ~79~59 preferable to lay the fiberboard ply 14 in stagger relationship on the polystyrene ply 12 as to obtain a ship lap and thereby preventing a thermal bridge as shown at 18 and 20.
In accordance with my invention, it is also preferable to produce these sheathing 10 in size 2" x 4' x 9'. In mak-ing a wall, for instance, the exterior insulating sheathing 10 is nailed to the beams with polystyrene ply 12 facing the beams (such as 2" x 6" or 2" x 4") which are laid on a floor. During this operation, a person of normal weight can walk over the sheathing 10 without occurance of breaking the polystyrene ply 12: the fiberboard 14 enabling a greater weight distribution over the polystyrene layer 12. Also, generally it has been found that the present insulating sheathing 10 when affixed to the beams eliminates need for bracing, said sheathing 10 having sufficient structural stren~th to hold the beams. Yet sheathing 10 is very easily cuttable, and it was found to have excellent dimensional stability aside from having good insulating characteristics. Once fixed on the 2" x 6" or 2" x 4", the wall is put on its upward position, the exterior o~ the sheathing 10 which is the fiberboard ply 14 coated with asphalt 14a is able to receive on it a finish 30, for instance clad boards such as vinyl or aluminum type which may be nailed through the sheathing 10 onto the beams.
From the interior in succession are added, for instance, the glass fibre 40 in between the spacing created by the beams 42, a air/vapor barrier 44 held in place by strapping 46, and then the gypsum wall panel as shown in Figures 1 and 2 next to strapping 46.
.
~- ~
79~5~3 Since the wall panels are generally 4' x 8', the 4' x 9' sheathing panels allow an overhand beyond the wall to cover the floor spacing 50-52. Also, as is easily seen the present invention allows for a gain 54 in the floor surface area over the prior art that requires the insulating shea-thing 10 to rest on the floor instead in accordance with present invention said sheathing 10 is secured on beam 42.
As seen in Figure 3, the polystyrene foam ply 12 is fastened by glue 16 to a waferboard 14b which is generally self-1~ containing a wax coating as is illustrated by means of 14a.
Such a sheathing has generally a minimum tensile strength of about 65 ~ 14 kPa, a linear expansion at 97% RH
and 23C of less than 0.40% + .02, and a minumum ~ater vapour transmission of 96 nonagrams per second per meter s~uare (ng/Pa.S.m2) a modulus of rupture of 0.5 to 17.2 megaPascal tmPa). When fiberboard is used, the minimum rac~ing load is of the order of 2100 ~ 200 lbs and the modulus of rupture is of the order of 0.6 + .1 megaPascal.
When a wafer board is used, the minimum racking load is more of the order of 2300 + 300 lbs for a ply having a thickness of 3/8" to 1/4" and 3500 ~ 200 for a ply of o.5 inch in thickness and the modulus of rupture is 16.2 + 1 megaPascal.
The following will serve onl~ to illustrate particular embodiments of the invention and to compare some of these embodiments over the prior art.
An insulating sheathing was made using a 0.5 inch fiber-board asphalt coated on one side, glued to a polystyrene foam having a density of 1 lb/ft3 and a thickness of 1.5":
the R value was determined and found to be 6.85. This was 3. ~794S9 compared against the following existing insulating sheathing where R is shown:
Applicant's product - 1.5" 6.7 EscladTM Phenolic foam - 1.1" 6.0 GlascladTM glass fibre 1" 4.4 GlascladT~ glass fibre 1~" 6.7 Six insulating sheathing panels were made as in Example 1. The sheathing panels were a composite board of fiber-board 7/16'i thick and expanded polystyrene 1-7/16" thick, measuring nominally 4' x 9'. A racking load evaluation of the six (6) sheathing panels was made.
Three standard wood frames were built in accordance to ASTM Standard ~-72, Section 14, each frame accomodating 2 sheathing panels. Stud grade spruce wood was used instead o~ the southern pine or douglas fir required by the Standard.
Sheathin~ panels were fastened with 3" spiral wood nails having a square plastic "washer" measuring lxl". The nails were located at 6" intervals along the perimeter of the frame assembly and at 4 of the intermediate studs.
Inside corner studs were not used to fasten the panels.
The mix-stud where the sheathing panels butt joint with approximately 1/2" fiberboard overlap on the polystyrene, nails were placed on both sheathing panels at varying angles between 15 to 30 degrees from ~he vertical at 6" intervals.
A hydraulic ~ack with a nominal capacity of lO,OO0 lb was used to apply the load. A Moog 5ervo controller and load cell feedback system controlled the applied load which was read in a Daytronic Model 9005 Strain Gage Transducer 1 ~7945~3 :
Conditioner/Indicator with a resolution of 5 lb.
Racking loads were applied at intervals varying between 50 and 250 lbs. Readings were taken immediately after reaching each load level. Dial Gages #1 and #2 were removed when damage was possible. The test results are shown in Tables 1, 2 and 3.
Frame Nool Dial Gage Readiny Load, lbs.
Inches #1 #2 #3 O O O O
.115 0 .20 50 .310 .002 .67 100 .420 .047 1.10 150 1.53 400 1.77 500 2.05 600 2.16 700 2.68 850 3.07 1000 5.27 1800 (Maximum racking load recorded)2220 Frame No:2 Dial Gage Reading Load, Lbs Inches #1 #2 #3 O O O O
.468 .028 .67 260 30.476 .038 1.10 500 .632 .051 2.36 860 .688 .058 3.03 1000 4.57 1500 6.14 1800 7.12 1940 (Maximum racking loard) 2100 1 ~7945~
g Frame No:3 Dial Gage ReadingLoad, Lbs Inches #1 #2 #3 S O O o o .130 .015 .27 100 .235 .058 .55 200 .360 .228 1.26 400 .408 .243 1.61 500 10.445 .253 2.00 600 .492 .263 2.44 700 .525 .268 2.71 800 .555 .273 3.11 900 .585 .277 3.38 1000 15.610 .279 3.70 1100 .631 .281 3.97 1200 .660 .284 4.33 1300 5.00 1550 5.31 1600 5.75 1700 6.22 1800 (Maximum racking load) 2000 .
EX~MPLE 3 1. INTRODUCTION
A sample sheathing panel was made as in Example 1. The panel had a first ~12 mm (1/2") bitumen coated fibre board ply and a ~37 mm (1-1/2") expanded polystyrene insulation board, and nominal dimensions of 1220 x 2743 x 50 mm (48" x 108" x 2"). The following tests were made:
1) Weight per unit area 2) Tensile strength (ASTM D1623) - perpendicular 3) Racking load (ASTM) E73 Sect. 14) 4) ~inear expan~ion (ASTM D1037) 5) Water vapour transmission (ASTM E96) 6) Water absorption (ASTM D2842) - after 2 and 24 hrs under 50 mm of H2O
7) Flexural strength (ASTM c2~3) - at 250, 406 and 610 mm spans ~ .. ' ' :
: , 79~S~3 The results as shown in Tables 4, 5 and 6.
(1) t2)* (3) (4) Tensile Racking Linear Weig~t Strength Load Expansion(%) Specimen (kg/m-l (kPa) tlbs)max 97%RH. 23C
1 3.77 75.12,220 0.39 2 3.81 45.02,100 0.39 3 3.80 65.82,000 0.41 ~ 3.80 74.2 0.42 0.41 6 0.38 Average 3.80 65.02,107 0.40 SD (n-l) 0.02 14.0110 0.02 (2)* Cohesive failure of the fiberboard Water vapour transmission Water absorption Specimen (q/s.m2L (n /Pa.s.m2) (2 hrs) (24 hrs) 1 1.33x10-4 96.0 1.45 9.42 2 1.47x10-4 106.0 1.46 7.51 3 1.39x10-4 100.6 1.38 7.46 4 1.42 8.12 Average 1.40x10-4 100.9 1.43 8.13 25 SD (n-l) 7.0xlO 6 5.0 0-04 0.91 .
.
. " ~ . ~ '' .
-Flexural Strength*
Specimen Modulus of Modulus of Elasticity (MPA) Rupture (kPa) 1 17.8 26.7 28.1 584 542 572 2 16.8 27.8 29.8 613 601 567 3 17.0 27.6 29.6 591 535 587 4 17.6 24.5 29.4 610 543 529 10 5 18.1 27.4 30.3 562 594 598 Average 17.5 26.8 29.4 592 563 571 SD(n-l) 0.5 1.4 0.8 21 32 26 *With expanded polystyrene in tension EXAMPLES 4 to 6 Four pieces of polystyrene foam composi~,e boards with each board measuring approximately 1200 x 1200 x 48 mm (48"
x 48" x 1-7/8") were made with 38 mm thick polystyrene foam and bonded with 10 mm thick compr~ssed wood fiberboard.
These insulation products were analyzed ~or thermal conductivity and thermal resistance determination as follows:
1) Equipment The Dynatech R-Matic heat-flow meter having a test accuracy of about + 2% was used to perform all tests. This instrument has the established capabili~y of measuring test sample with thickness up to 200 mm and it conforms to ASTM
C-518, Standard Test Method for Steady-State Transmission Properties by Means of the Heat-Flow Meter.
2) Sample Preparation Three boards were randomly selected for sample preparation. (Examples 4 to 6). A test specimen measuring : ~ " , '.
, . . . . .
610 x 610 mm (24" x 24") was prepared from the central portion of each board. The thickness of the test specimens was measured accurately with a dial gauge in 12 points and an average thickness value was determined. The total mass of each specimen was weighed to an accuracy of + 0.01 kg.
The mass and thickness of the test specimens are given in Table 7.
The prepared test specimens were conditioned at 25C
and 50% R.H. humidity for 48 hours prior to the test.
3) Test Procedure Each of the test specimen was first placed in the test chamber of the instrument and the chamber plate separation was set at the exact thickness of the sample. The instrument was then activated and equilibrated until a steady-state condition was reached. For each test, the test specimen has been kept in the instrument for a period totalling about 4.5 hours to monitor the steady-state equi-librium condition by a computer controlled data acquisition system. The test was conducted at atmospheric pressure and ambient room conditions, with room temperature in the range of 22-24C and humidity in the range of 45-50% R.H. The mean temperature of each test sample was about 24.5 +
0.1C and the temperature differential across the test specimen was about 22.1 + 0.1C.
RESULTS
The thermal conductivity, K-factor, and thermal resis-tance, R-value, of the test samples have been determined and are given in the-following Table 7, in both metric SI units and imperial units.
~. .
. ' .
~79afS9 Thickness, Foam Mass and Foam Density of Test Samples Test Specimen Average Thickness Foam Mass Foam ~ensity Example (mm) (inch) (kq~(lbs) (Kg/m~)(lbs/ft3~
#4 48.60 1.91 1.41 3.10 77.79 4.08 #5 48.58 1.91 1.44 3.17 79.35 4.96 #6 48.58 1.91 1.39 3.06 76.40 4.79 10Average 48.59 1.91 1.41 3.11 77.94 4.61 Thermal Conductivity, Thermal Resistance and K-Factor R/unit thickness Imperial Imperial Metric SI Unit Metric SI Unit Un2it (ft ,hr Unit (Btu/ft2 (m C/M) F/Btu) Example (W/mC) hr,F/inL /m _ /in #4 0.0425 0.2947 23.529 3.393 #5 0.0428 0.2970 23.364 3.367 #6 0.0414 0.2874 24.154 3.479 20Average 0.0422 0.2930 23.682 3.413 Thermal Resistance, R-Value, per Test Sample Thickness Met~ic SI Unit Imp2erial Unit Example _~ C/W) (ft ,h,F/Btu) #4 1.143 6.493 25#5 1.134 6.438 #6 1.172 6.656 Average 1.149 6.529 Mod~fications may be made without departing from the spirit of the invention as defined in the appended claims.
; '' ,'~
.
: , 79~S~3 The results as shown in Tables 4, 5 and 6.
(1) t2)* (3) (4) Tensile Racking Linear Weig~t Strength Load Expansion(%) Specimen (kg/m-l (kPa) tlbs)max 97%RH. 23C
1 3.77 75.12,220 0.39 2 3.81 45.02,100 0.39 3 3.80 65.82,000 0.41 ~ 3.80 74.2 0.42 0.41 6 0.38 Average 3.80 65.02,107 0.40 SD (n-l) 0.02 14.0110 0.02 (2)* Cohesive failure of the fiberboard Water vapour transmission Water absorption Specimen (q/s.m2L (n /Pa.s.m2) (2 hrs) (24 hrs) 1 1.33x10-4 96.0 1.45 9.42 2 1.47x10-4 106.0 1.46 7.51 3 1.39x10-4 100.6 1.38 7.46 4 1.42 8.12 Average 1.40x10-4 100.9 1.43 8.13 25 SD (n-l) 7.0xlO 6 5.0 0-04 0.91 .
.
. " ~ . ~ '' .
-Flexural Strength*
Specimen Modulus of Modulus of Elasticity (MPA) Rupture (kPa) 1 17.8 26.7 28.1 584 542 572 2 16.8 27.8 29.8 613 601 567 3 17.0 27.6 29.6 591 535 587 4 17.6 24.5 29.4 610 543 529 10 5 18.1 27.4 30.3 562 594 598 Average 17.5 26.8 29.4 592 563 571 SD(n-l) 0.5 1.4 0.8 21 32 26 *With expanded polystyrene in tension EXAMPLES 4 to 6 Four pieces of polystyrene foam composi~,e boards with each board measuring approximately 1200 x 1200 x 48 mm (48"
x 48" x 1-7/8") were made with 38 mm thick polystyrene foam and bonded with 10 mm thick compr~ssed wood fiberboard.
These insulation products were analyzed ~or thermal conductivity and thermal resistance determination as follows:
1) Equipment The Dynatech R-Matic heat-flow meter having a test accuracy of about + 2% was used to perform all tests. This instrument has the established capabili~y of measuring test sample with thickness up to 200 mm and it conforms to ASTM
C-518, Standard Test Method for Steady-State Transmission Properties by Means of the Heat-Flow Meter.
2) Sample Preparation Three boards were randomly selected for sample preparation. (Examples 4 to 6). A test specimen measuring : ~ " , '.
, . . . . .
610 x 610 mm (24" x 24") was prepared from the central portion of each board. The thickness of the test specimens was measured accurately with a dial gauge in 12 points and an average thickness value was determined. The total mass of each specimen was weighed to an accuracy of + 0.01 kg.
The mass and thickness of the test specimens are given in Table 7.
The prepared test specimens were conditioned at 25C
and 50% R.H. humidity for 48 hours prior to the test.
3) Test Procedure Each of the test specimen was first placed in the test chamber of the instrument and the chamber plate separation was set at the exact thickness of the sample. The instrument was then activated and equilibrated until a steady-state condition was reached. For each test, the test specimen has been kept in the instrument for a period totalling about 4.5 hours to monitor the steady-state equi-librium condition by a computer controlled data acquisition system. The test was conducted at atmospheric pressure and ambient room conditions, with room temperature in the range of 22-24C and humidity in the range of 45-50% R.H. The mean temperature of each test sample was about 24.5 +
0.1C and the temperature differential across the test specimen was about 22.1 + 0.1C.
RESULTS
The thermal conductivity, K-factor, and thermal resis-tance, R-value, of the test samples have been determined and are given in the-following Table 7, in both metric SI units and imperial units.
~. .
. ' .
~79afS9 Thickness, Foam Mass and Foam Density of Test Samples Test Specimen Average Thickness Foam Mass Foam ~ensity Example (mm) (inch) (kq~(lbs) (Kg/m~)(lbs/ft3~
#4 48.60 1.91 1.41 3.10 77.79 4.08 #5 48.58 1.91 1.44 3.17 79.35 4.96 #6 48.58 1.91 1.39 3.06 76.40 4.79 10Average 48.59 1.91 1.41 3.11 77.94 4.61 Thermal Conductivity, Thermal Resistance and K-Factor R/unit thickness Imperial Imperial Metric SI Unit Metric SI Unit Un2it (ft ,hr Unit (Btu/ft2 (m C/M) F/Btu) Example (W/mC) hr,F/inL /m _ /in #4 0.0425 0.2947 23.529 3.393 #5 0.0428 0.2970 23.364 3.367 #6 0.0414 0.2874 24.154 3.479 20Average 0.0422 0.2930 23.682 3.413 Thermal Resistance, R-Value, per Test Sample Thickness Met~ic SI Unit Imp2erial Unit Example _~ C/W) (ft ,h,F/Btu) #4 1.143 6.493 25#5 1.134 6.438 #6 1.172 6.656 Average 1.149 6.529 Mod~fications may be made without departing from the spirit of the invention as defined in the appended claims.
; '' ,'~
.
Claims (9)
1. An exterior insulating sheathing comprising a foam poly-styrene ply and a second ply selected from the group consisting of fiberboard ply and waferboard ply, said second ply being glued to said polystyrene ply throughout with a continuous layer of glue, so that said continuous layer of glue is sandwiched between said foam polystyrene ply and said second ply has to continuously fasten said polystyrene ply to said second ply, to form a unitary product defining a sheathing, said sheathing having the exposed side of said second ply water resistant, said sheathing being nailable and having a racking load according to ASTM E-72 of about 1900 to 3700 lbs, a minimum tensile strength of 65 ? 14 kiloPascal, a linear expansion at 97% relative humidity and 23°C, of less than 0.40% ? .02, a water vapour trans-mission of at least 96 nonagram per second per meter square (ng/Pa.s.m2), and a modulus of rupture of 0.5-17.2 mega-Pascal (mPa).
2. The sheathing as defined in claim 1 wherein said poly-styrene ply has a density of about 0.6 lb/cu ft to 1.5 lbs/ft3 and wherein the thickness of said polystyrene is 1.5 ? 1 inch.
3. The sheathing as defined in claim 2 wherein said second ply is a fiberboard, and for said sheathing the racking maximum load is about 2100?200 lbs and the modulus of rupture is about 0.6 + 0.1 megaPascal.
4. The sheathing as defined in claim 3 wherein said fiber-board ply is about half an inch, said polystyrene ply about an inch and a half, and has a density value fo 1?1 lb/ft3, and the sheathing has a R value is 6.5?0.3 Imperial unit (ft2,hr, oF/Btu) as per ASTM C518.
5. The sheathing as defined in claim 2 wherein said second ply is a waferboard ply and the sheathing has a racking maximum load of about 3500 lbs ? 200 and a modulus of rupture of 16.2 ? 1 megaPascal.
6. The sheathing as defined in claim 1 wherein the exposed side of said second ply is asphalt coated.
7. The sheathing as defined in claim 1 wherein the second ply is a fiberboard ply being asphalt impregnated.
8. The sheathing as defined in claim 1 wherein the second ply is a waferboard self-containing a wax coating which renders said exposed side water resistant.
9. The sheating as defined 1 claim having at least one ship lap.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 534090 CA1279459C (en) | 1987-04-07 | 1987-04-07 | Exterior insulating sheathing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 534090 CA1279459C (en) | 1987-04-07 | 1987-04-07 | Exterior insulating sheathing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1279459C true CA1279459C (en) | 1991-01-29 |
Family
ID=4135386
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 534090 Expired - Fee Related CA1279459C (en) | 1987-04-07 | 1987-04-07 | Exterior insulating sheathing |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1279459C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10316515B2 (en) | 2016-01-29 | 2019-06-11 | Owens Corning Intellectual Capital, Llc | Structural insulated sheathing |
-
1987
- 1987-04-07 CA CA 534090 patent/CA1279459C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10316515B2 (en) | 2016-01-29 | 2019-06-11 | Owens Corning Intellectual Capital, Llc | Structural insulated sheathing |
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