A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Reconstruction and Supplementary Thermal Insulation of Flat Roofs
The report describes an experimental and theoretical investigation of a new method involving exterior insulation and closed ventilation gap. In this way both thermal insulation and moisture conditions are improved. The aim of the investigation was to study how exterior supplementary insulation should be performed (methods of production, detailed solutions etc.) and how the roof construction has functioned from building physics point of view. Special interest was given to how the moisture conditions in the original roof construction were influenced by exterior insulation and closed ventilation gap. Important conclusions: - Exterior supplementary insulation and closed ventilation gap improves the thermal insulation ability and decreases by that the heating requirements. - The supplementary insulation to a temperature increase in the original construction resulting in decreased relative humidity. This results in a drying of the construction, i.e. the moisture ratio is decreased. - The ventilation gap should be closed at a moisture ratio less than 15% to achieve full effect of the supplementary insulation. - The method offers a simple production technology with good availability and economy. - The risk of fire propagation in built-up areas is decreased. The closed ventilation gaps results in a hampered fire propagation between attic rooms via the eaves. The supplementary insulation results in a slower burning of the original tightening layer, which also makes fire propagation difficult. - With bevelled supplementary insulation it is possible to improve the pitch towards the drains. This also involves decreasing heat resistance against valleys and roof sinks, which creates more favourable chances for melted snow to run off the roof. (With 42 refs.).
Reconstruction and Supplementary Thermal Insulation of Flat Roofs
The report describes an experimental and theoretical investigation of a new method involving exterior insulation and closed ventilation gap. In this way both thermal insulation and moisture conditions are improved. The aim of the investigation was to study how exterior supplementary insulation should be performed (methods of production, detailed solutions etc.) and how the roof construction has functioned from building physics point of view. Special interest was given to how the moisture conditions in the original roof construction were influenced by exterior insulation and closed ventilation gap. Important conclusions: - Exterior supplementary insulation and closed ventilation gap improves the thermal insulation ability and decreases by that the heating requirements. - The supplementary insulation to a temperature increase in the original construction resulting in decreased relative humidity. This results in a drying of the construction, i.e. the moisture ratio is decreased. - The ventilation gap should be closed at a moisture ratio less than 15% to achieve full effect of the supplementary insulation. - The method offers a simple production technology with good availability and economy. - The risk of fire propagation in built-up areas is decreased. The closed ventilation gaps results in a hampered fire propagation between attic rooms via the eaves. The supplementary insulation results in a slower burning of the original tightening layer, which also makes fire propagation difficult. - With bevelled supplementary insulation it is possible to improve the pitch towards the drains. This also involves decreasing heat resistance against valleys and roof sinks, which creates more favourable chances for melted snow to run off the roof. (With 42 refs.).
Reconstruction and Supplementary Thermal Insulation of Flat Roofs
P. Andersson (author)
1987
183 pages
Report
No indication
English
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