EP2707555A1

EP2707555A1 - Device for supporting an over-roof, and method for manufacturing an over-roof support without drilling

Info

Publication number: EP2707555A1
Application number: EP12723254.4A
Authority: EP
Inventors: Alain Blotiere
Original assignee: Icopal SAS
Current assignee: Icopal SAS
Priority date: 2011-05-10
Filing date: 2012-05-03
Publication date: 2014-03-19
Also published as: FR2975113A3; FR2975113B3; WO2012153246A1

Abstract

The invention relates to a device for supporting an over-roof for new constructions or repairs, which is capable of being positioned on a roof-supporting element, and which includes a linking element consisting of a linear profile section (1) comprising a planar sub-surface provided by means of the permanent assembly to a system of hooks (2) capable of being applied by simple manual pressure on a sheet of velvet (3) also arranged by permanent assembly onto the covering of a bituminous sealing membrane (4), said sheet of velvet being vertically in line with the mechanical fasteners of said membrane.

Description

SUPPORT DEVICE FOR A SURFACE AND METHOD FOR MAKING A SURFACE SUPPORT WITHOUT DRILLING.

The invention relates to a connection system for securing to the carrier member of a roof with a sealing coating an outer structure of roofing with the aid of an almost linear profile attached to the surface of a membrane single-layer waterproofing to the right mechanical fasteners of said membrane, this being done by self-gripping textile system without drilling, which has the effect of deferring to the carrier member the wind uplift efforts and downward loads without stress of the flexural membrane in a simple and reliable way.

The invention also relates to the methods for implementing such elements.

In many cases of roofing, it is necessary to fix above the plane of the roof (at a distance of a few cm to a few tens of cm) constructive or decorative elements or other. The charges thus reported are secured to the supporting element (steel tank, concrete slab, wood panels) through sealing by posts, emergences, legs of various kinds. The expression "through the seal" shows the risk that the seal is perforated, thus making it unfit for its primary and primary use. A second element must be taken into consideration which touches very precisely the loads transmitted by the support legs. Thus, when the overcrowding, in addition to its own weight (a few tens of kg per m ² ) receives heavy snow loads (up to 200 kg per m ² depending on the climatic region), large masses are expected to descend on the carrier element, no longer uniformly distributed as it was the case in the absence of over-roofing, but only via the singular points of support of the over-roof. The charges then become punctually very important and can cause local failures of the carrier element, steel or wood.

The object of this invention is therefore to circumvent the risks of leakage and the risk of local overload, while ensuring an extremely fast implementation and simple because traditional. To circumvent the risk of leakage, a number of devices are known that, for the sake of clarity, we will fall into two categories:

1. The legs can be installed on the supporting element before the insulation / sealing system is put in place. It is then necessary that the sealing works are done by bypassing the posts, legs, massive and then by carrying out measurements of sealing which connect the tightness of the current part to the bases of the posts / bases and by relating systems of protection in head of these statements.

This technique is well mastered but has a number of disadvantages:

at. It is necessary to have a precise knowledge of the structures to bring back above the plan of the waterproof roofing from the design phase of the works, so as to be able to prepare a preliminary layout of the bases.

b. Execution of the waterproofing surveys is a laborious task and yet essential for the proper functioning of the system as a whole, because it is well known that most of these leaks are caused by leaks.

vs. The protection at the top of the readings is all the more laborious as the base is small.

The multiplication of the bases / legs then becomes an essential source of failures of the operation of the system.

2. The legs may be installed at the same time as the waterproofing layer (ie above the layer of thermally insulating material) provided that:

at. they are positioned in the covering of the sealing layer. This strict restriction leads to the fact that it can be difficult to obtain a perfect alignment of the posts / legs, since it is well known that the flexible sealing sheets have peelings of rectitude (also called banana effect) according to which, on long distances, it is extremely difficult to maintain the alignment.

b. that their base has a particular shape that makes the fasteners solidarisant the base to the carrier element, are sufficiently protected by the covering of the seal. A device of this type is described in patent FR 2 713 687 B1 of December 15, 1993. vs. that cutting work of the sealing sheet is carried out to the right of the bases to allow them to be inserted into the cover without surplus material. Knowing that these cuts are left to the good care of the worker, it happens that they are not carried out strictly in the recommended manner, the risk becomes even higher than the number of legs to put in place is high.

The object of the present invention is to solve the problems related to the achievement of the seal while allowing the forces to be distributed optimally on the carrier element, regardless of the configuration of the frame. In particular, the assembly of the profiles without piercing or welding operation guarantees a tightness of the optimal structure because totally equivalent to a traditional structure. According to the invention, a device for supporting an overprint for new or refurbishing work, capable of being put in place on a roof-carrying element, is characterized in that it comprises a connecting element constituted by a linear section comprising a flat underside equipped with perennial assembly (crosslinked bonding for example) a system of "hooks" to be placed by simple manual pressure on a "velvet" disposed perennial assembly also on the cover of a membrane of bituminous waterproofing, this velvet being in line with the mechanical fastenings of the said membrane. The terms velvet and hooks are to be understood in a very general sense and denote all flexible hook-and-loop fastening systems, equivalent and all their extensions, in particular non-woven fabrics, woven fabrics, hooks, mushrooms. The hook system preferably has the same width as the underside of the profile, and the pile also has the same width. Advantageously, a strip carries the system of hooks, and velvet is also a strip. Continuous velvet is subjected to the surface of the bituminous waterproofing membrane, on the opposite side to its weld seam, said membrane being mechanically fastened in its lateral weld seam by point mechanical fasteners secured to the carrier element through layers possible of old waterproofing coating, thermal insulation and vapor barrier membranes, this having the effect of superimposing the axis of the profiles with the line of mechanical fasteners. The profile material has a low coefficient of expansion of the order of 10 ^{~ 5} K ^{~ 1} . The material of the profiles is advantageously chosen from a group of materials comprising: metal, acrylic styrene acrylonitrile resin ASA, reinforced polyester. The profiles may have been obtained by extrusion or pultrusion. The shape of the profile section is designed to allow easy fixing without drilling.

Generally, the length of the linear section is of the order of 2 meters. Preferably the linear section is made of a material having a low coefficient of thermal expansion (of the order of 12 × 10 ^-6 K ^-1 ) so that it has low movements on the roof. amplitude of expansion movements by decreasing the length of the profiles The invention also relates to a method of producing an overlay support using a device as defined above, in which an underlying layer structure is produced on the carrier element of the roof by successively laying several layers that may comprise a vapor barrier, one or more thermal insulation beds according to the desired thermal performance, a single-layer bituminous waterproofing coating consisting of a sheet mechanically fixed in the carrier element by point mechanical fastenings in the lateral covering, characterized in that: Waterproofing is equipped with a velvet band on the surface of the cover opposite to the weld seam,

- A linear section having a flat underside equipped with perennial assembly of a hook system is applied by simple manual pressure on the velvet band, above the mechanical fasteners of said membrane. When the bituminous sheet is not pre-equipped at the factory with its velvet band, it is adhered by any glue suitable for this purpose, depending on the nature of the sealing sheet and the nature of the velvet. The bituminous sheet may comprise the removal at the factory of the "velvet" strip on the hot bitumen, on the side opposite to the overlapping strip, at the time of removal of the protective granules from the upper face of said sheet.

Final assembly on site is done according to the following steps:

conventional application of the monolayer sealing liner mechanically fixed in its welded lap joint,

- application of the profiles on the "velvet" of the sheet by manual pressure

The velvet being disposed on the opposite side of the weld seam, it will automatically find itself in line with the fixing line after welding the strip.

The interests of such a particular provision are that:

- the forces of lifting by the wind are of identical nature and applied in a place identical to those of the same bare membrane, diminished of the value of the own weight of the under-roofing and all its elements of assembly, including profiles: the solution is therefore very secure vis-à-vis this solicitation and it is not necessary to resort to different fasteners of the usual fasteners for this type of assembly;

- There is no risk of lifting since the assembly is carried out in the right mechanical fasteners themselves fixed in the resistant load-bearing element, which guarantees the shape stability of the over-roofing and the absence of efforts of flexion: it will be possible to have over-roofing in "fragile" elements, glass elements for example;

the vertical downward forces due to the snow are known and perfectly distributed over the line of fastenings, which allows an easy calculation;

- The profiles can not be placed in other places than those equipped with "velvet" which prevents any malfunction;

- The distances between profile lines being usually 0.88m, this allows not to use a secondary mesh of profiles to support the over-roof, thus reducing the weight and cost of the structure.

This system can receive any over roof, for example solar thermal or photovoltaic collectors. Mechanical fastening systems are possible on any load-bearing element with suitable mechanical fasteners, as shown in the usual reference documents (DTU, DTA, etc. standards) but are of course particularly suitable for metal bearing elements (steel sheets ribbed).

According to the invention, it is possible to leave a sufficient distance between profiles placed end to end to allow the flow of rainwater when these are perpendicular to the direction of flow of water.

The profiles will advantageously be chosen from a material that is particularly resistant to temperature and corrosion and that has a low coefficient of expansion if possible, such as, for example, polyester reinforced with glass fibers or acrylic acrylonitrile styrene ASA resin. They are also characterized by a total insensitivity to corrosion, a very high ohmic resistivity and, of course, a total resistance to water (neither recovery nor swelling). Their excellent electrical performance make them particularly suitable for supporting photovoltaic panels, these elements are not the only ones that the structure can accommodate.

The profiles are obtained by an extrusion or pultrusion process using dies. The constituent materials of the profiles are worked with extreme ease, through the implementation of portable tools typically used for carpentry. This makes sense when we recall that we are here in the context of roofing work, on new buildings, with little electric power available.

Other features and advantages of the invention will appear in the following description of a preferred embodiment with reference to the accompanying drawings but which has no limiting character. On these drawings:

Fig. 1 is a sectional view of the section equipped with its hook textile according to the invention.

Fig. 2 is a sectional view of the sealing membrane equipped with its velvet.

Fig. 3 is a perspective view of the assembly of a roof according to the invention. A device according to the invention implements a set of linear elements whose installation occurs at particular and different times, during the implementation of the seal. Finally, the materiality of these profiles is not at the origin of an excessive additional heat load which would modify the fire behavior of the roofing system (measured according to the so-called standards of fire resistance coming from the outside, in particular the European test procedure prCEN / TS 1 187).

The invention consists of a set of a membrane 4 and a specific section 1 delivered separately on the site. The linear profile 1 comprises a flat underside equipped with perennial assembly of a hook system 2 clean to be placed by simple manual pressure on a velvet 3 disposed perennial assembly also on the cover of the bituminous waterproofing membrane 4, this velvet being in line with the mechanical fastenings of said membrane. The system of hooks 2 has the same width as the underside of the profile, and the pile 3 has the same width.

The continuous velvet 3 is subjected to the surface of the bituminous waterproofing membrane 4, on the opposite side to its weld 5, said membrane being mechanically fixed in its lateral weld seam by point mechanical fasteners 6 secured to the element carrier through the possible layers of old waterproofing coating, thermal insulation and vapor barrier membranes, this having the effect of superimposing the axis of the profiles with the line of mechanical fasteners.

As regards the implementation, it is carried out according to the following sequences.

On the supporting element of the roof (steel tank, concrete slab, wooden decking) we successively put:

- a vapor barrier if necessary,

one or more thermal insulation beds according to the thermal performance sought,

- the monolayer waterproofing membrane 4, laid freely (or welded in full or partially), mechanically fastened at the edge in the weld seam by mechanical fasteners with distribution plates 6, seals welded, so as to meet both the needs of the mechanics (profiled perpendicular to the waves of the steel tray if it is the carrier element) and / or the aesthetic wishes (on concrete support is the desired layout for the over-roofing which will be determining), according to the conventional technique of mechanically fixed sealing liners in the lap joint;

- Then the finished elements of the profiles 1 are aligned and applied by simple manual pressure on the "velvet" band of the waterproofing membrane. The ends of the profiles 1 are brought about 10 mm from each other, or more if it is desired to provide a space for the flow of water. The total length of the alignment is one of the lengths of the field on which the overlay will rest.

The overlay is then mechanically fastened to the profiles by conventional fastening means (screws, rivets etc.), either directly if its elements are intended to be parallel to the plane of the waterproofing membrane, or on a secondary framework that can be sloping, for example using triangles supports attached to the profiles, if one wishes to orient these elements out of said plane.

The shape of the profile section 1 is provided to allow easy fastenings without drilling. According to FIGS. 1 and 3, the section of the section 1 has a trapezoidal shape, preferably isosceles, whose large base is provided with the system of hooks 2. The small base comprises a central slot defining a groove for receiving fasteners . The interior of the trapezium is stiffened by an inverted A profile, the tip of the A being on the inside of the large base.

Depending on the type of roofing, the configuration of the structure, the nature of the loads to be resumed, it may be sufficient to put a line of sections every two or three meters; in this case the membrane mechanically fixed to use at these locations will simply be the same membrane not equipped with "velvet", to ensure an aesthetic rendering and cost optimized.

The waterproof roof thus produced may have a slope ranging from flat to vertical, as far as the structure allows otherwise. Whatever the slope and arrangement of the emergents in relation to the slope, there is no barrier to the flow of water since, in the worst case, windows (formed by adjacent abutment areas ) are arranged in the profile lines. In order to avoid making flatness adjustments, it will simply avoid having the profiles to the right of the cover ends of the sealing sheets. The velvet can be applied by gluing on the membrane (on site or at the factory), or in the factory at the time of manufacture.

Velvet and hooks are made of a rot-proof material that is resistant to aging, heat and water.

Claims

1. Device for supporting an overlay, for new or refurbishing work, capable of being put in place on a roof-carrying element, characterized in that it comprises a connecting element constituted by a linear section (1) comprising a sub-section flat surface equipped by perennial assembly of a system of hooks (2) adapted to be placed by simple manual pressure on a velvet (3) disposed perennially also on the covering of a bituminous waterproofing membrane (4), this velvet being in line with the mechanical fastenings of said membrane.

2. Device according to claim 1, characterized in that the system of hooks (2) has the same width as the underside of the profile, and the pile (3) has the same width.

3. Device according to claim 1 or 2, characterized in that the continuous pile (3) is secured to the surface of the bituminous waterproofing membrane (4), the side opposite to its weld line (5), said membrane being fixed mechanically in its lateral weld seam by point mechanical fasteners (6) secured to the carrier element through the layers of old waterproofing, thermal insulation and vapor barrier membranes, this having the effect superimpose the axis of the profiles with the line of the mechanical fasteners.

4. Device according to any one of the preceding claims, characterized in that the profile material has a low coefficient of expansion of the order of 10 ^{~ 5} K ^"1 .

5. Device according to any one of the preceding claims, characterized in that the material of the profiles is selected from the group of materials comprising: metal, acrylic styrene acrylonitrile resin ASA, reinforced polyester.

6. Device according to any one of the preceding claims, characterized in that the profiles were obtained by extrusion or pultrusion.

7. Device according to any one of the preceding claims, characterized in that the shape of the profiles is provided to allow easy fastenings without drilling.

8. A method of producing a super-roofing support using a device according to any one of the preceding claims, wherein an underlying layer structure is produced on the roof-carrying element by successively laying a plurality of layers which can comprising a vapor barrier, one or more thermal insulation beds according to the desired thermal performance, a single-layer bituminous waterproofing coating consisting of a sheet mechanically fixed in the carrier element by point mechanical fastenings in the lateral covering, characterized in that: - the sheet of the sealing liner is equipped with a velvet band on the surface of the liner opposite to the weld seam,

- A linear section (1) comprising a flat underside equipped by perennial assembly of a system of hooks (2) is applied by simple manual pressure on the velvet band (3), in line with the mechanical fasteners of said membrane.

9. A method according to claim 8, characterized in that, since the bituminous sheet is not pre-equipped in the factory with its velvet band, it will be glued by any adhesive suitable for this purpose, depending on the nature of the sheet sealing and the nature of velvet.

10. A method according to claim 8, characterized in that the bituminous sheet comprises the removal from the factory of the "velvet" strip on the hot bitumen, the side opposite the overlapping strip, at the time of removal of the protective granules of the upper face of said sheet.