Esko Sistonen

Jukka Piironen, Esko Sistonen, Seppo Huovinen Life Cycle of Repair Works of Rock Based Facades Date: 30/06/2003 Pages: 97 p.+ app. 39 p. Helsinki University of Technology Laboratory of Structural Engineering and Building Physics Rakentajanaukio 4, 02150 Espoo ESPOO ISBN 951-22-6654-7 ISSN 1456-4297 The aim of this study was to make a life cycle analysis of the repair methods of the rock based facades and to specify the main factors and their risks affecting on the length of the service life of the repair. The second aim was to study how the repair methods can be developed to make certain to reach the desired length of the service life. The problems of the facade repair methods were clarified by the life cycle analyse. The structures studied were cladding systems with the light gauge steel sheets and panels, cementitious panels, external wall insulation faced with plastering and concrete coatings. The life cycle costs compared with the length of the service life of the repair was studied. The service life of the cladding system with the light gauge steel sheets and panels, cementitious panels and external wall insulation faced with plastering will be determined by the aesthetic symptoms. Basing on the field research of the repaired facades proposals for actions to extend the service life of the repair methods were presented. Theoretical estimations of the service life was illustrated by stochastic methods. Examples of the method is presented in appendixes. The graphs of these examples may be used as a instrument to make the life cycle analysis and planning. Reliability of the estimations of the service life is governed by the quality of the deterministic equation and the selected distribution model and by the defectiveness of statistical data. The problem with the simplified equations is that they do not take into account several simultaneous deterioration defects and their interaction. A life cycle analysis for a residential building located in Espoo was made. Cost of repair for seven alternate repair methods was calculated. The repair methods of the calculation examples were the suggest ones in the condition survey made for the building. The changes in affordability ranking of the repair methods caused by the changes in length of the maintenance periods was studied in the sensibility examinations. The effects of the additional wall insulation on the heating energy consumption was studied in three real estates. The systematic of the condition survey for facades with the external wall insulation faced with plastering and cladding systems should be improved. Condition surveys made for the facades repaired by these methods will help to clarify the most dominating deterioration defects and to make service life models. This will furthermore guide to make more reliable life cycle analyses.

This guide on the renovation and repair of buildings with moisture and microbial damage explores the various stages of a renovation project, renovation design and the legislation on the topic. In addition to the available renovation and repair methods and the factors influencing the selection of the appropriate method, the guide presents more detailed principles of renovation and repair with the help of various solutions in principle. The guide also reviews quality assurance methods and the tools and practices in place for monitoring the success of renovation and repair work. Renovation and repair projects connected to moisture and microbial damage can also improve a building’s energy efficiency. In this case, it is important to be sure that after the work is complete, the renovated structure, which may now have additional insulation, is still functional from the perspective of building physics. The solutions presented in the guide are solutions in principle. Based on the informatio...

In this work, three carbonation depth predicting models using decision tree approach are developed. Carbonation, in urban areas is often a reason for reinforcement steel corrosion that causes premature degradation, loss of serviceability and safety of reinforced concrete structures. The adopted decision trees are regression tree, bagged ensemble and reduced bagged ensemble regression tree. The evaluation of the predictions performance of the developed models reveals that all the three models perform reasonably well. Among them, reduced bagged ensemble regression tree showed the highest prediction and generalization capability.

Moisture is one of the major factors in the physical deterioration processes of building facades. Physical deteriorations are typically caused by restrained moisture movements and freezing or are connected to chemical or biological attacks. Changes in moisture and temperature lead to the swelling and shrinking of building materials. Freezing of water in pores and cracks leads to an increase in volumes and causes scaling and spalling of materials. The continuous monitoring of temperature and relative humidity provides significant information about the long-term performance of buildings. Documenting the performance of repaired facades through this monitoring can enhance our understanding of the long term deterioration of materials and the changes in the structural behaviour due to aging. One objective of the research was to test the new possibilities offered by ICT (Information and Communication Technology) in the real estate and construction sector. For that purpose, a new relative h...

In this study vertical temperature gradient was measured and ventilation need was analyzed in two hall buildings with room height close to 10 m. One building was industrial assembly hall (without process) and another heated and ventilated warehouse. Both buildings had high ventilation rate of about 2 l/(s m) and well insulated building fabric according to the Finnish building code values. One objective was to measure differences in the temperature distribution as one building had air heating and another one radiant ceiling panel heating. This was quantified by vertical temperature gradient measurements in winter. Another objective was to assess minimum ventilation need in such halls. For that purpose available literature on indoor sources and ventilation needs was reviewed. The results showed about 0.2 K/m vertical temperature gradients in both halls which is by factor 5 smaller for air heating than the guidebook value likely because of ventilated and well insulated building. Temper...

Kosteusja homevaurioituneen rakennuksen korjausoppaan päivitys julkaistaan syksyllä 2019 ympäristöministeriön toimesta. Opas on täysin uudistettu ohje kosteusja sisäilmatekniseen ja muihin kuntotutkimuksiin perustuvan korjaussuunnittelun ja -työn avuksi. Päivityksessä on otettu huomioon korjausrakentamisen toimintaympäristön voimakas muuttuminen 2000-luvulla, joten oppaan sisältö poikkeaa oleellisesti edellisestä, vuonna 1997 kirjoitetusta oppaasta. Kosteusja mikrobivaurioista, niiden vaikutuksesta rakennuksen sisäilmaan ja käyttäjiin, erilaisista tutkimusja korjausmenetelmistä sekä korjausten onnistumisen seurannasta on viime vuosina tehty paljon sekä tieteellistä tutkimusta että toteutuksen kehitystyötä. Näiden sekä käytännön kohteissa saadun kokemuksen perusteella oppaassa tarkastellaan rakennusosien eritasoisia korjausmenetelmiä ja niiden soveltuvuutta sekä eroavaisuuksia. Tarkastelussa painotetaan aiempaa enemmän julkisille palvelurakennuksille ominaisia rakenneratkaisuja. Korj...

The objective of the research is to improve the use of the ICT (Information and Communication Technology) in the real estate and construction sector. For that purpose a new thermal and moisture RHTmonitoring network system was developed. The thermal and moisture RHT-monitoring network system is useful for assessing the repaired sandwich-type building facades performance and giving knowledge about the physical functioning of building envelopes.