Abstract
The design of a thermal envelope for low-energy buildings is dealt with from the point of view of heat and moisture transfer. The report is based on experience gained in Danish low-energy house projects, primarily the Hjortekaer projects. Insulation materials and methods of avoiding thermal bridges and other weak points in the envelope are discussed. 300 - 400 mm insulation in the roof is recommended in relation to 200-300 mm wall insulation. Through-going cracks should be avoided by using more layers if batts are used. Special, efficiently insulated frames and non-metallic spacers for windows, and shutters insulated by a thickness of 30mm, can significantly reduce heat loss. Tips for achieving an airtight building envelope, especially with regard to lead-in of cables, pipes and ducts, are given. Painted concrete surfaces, puttered and painted lightweight concrete or rendered and painted brickwork contribute to airtightness. Joints between precast panels need sealing and cables etc. should be lead through slightly oversize holes (one for each) and a sealing mastic should then be applied. Framework constructions (often wooden) need and airtight barrier, preferably 0.2 mm of polyethylene. All joints should be of the squeezed-lap type. The polyethylene can be protected by being placed 40 -
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Citation Formats
Saxhof, B.
Low-energy constructions. Implementation of experience gained; Lavenergikonstruktioner; Implementering af erfaringer.
Denmark: N. p.,
1993.
Web.
Saxhof, B.
Low-energy constructions. Implementation of experience gained; Lavenergikonstruktioner; Implementering af erfaringer.
Denmark.
Saxhof, B.
1993.
"Low-energy constructions. Implementation of experience gained; Lavenergikonstruktioner; Implementering af erfaringer."
Denmark.
@misc{etde_10141239,
title = {Low-energy constructions. Implementation of experience gained; Lavenergikonstruktioner; Implementering af erfaringer}
author = {Saxhof, B}
abstractNote = {The design of a thermal envelope for low-energy buildings is dealt with from the point of view of heat and moisture transfer. The report is based on experience gained in Danish low-energy house projects, primarily the Hjortekaer projects. Insulation materials and methods of avoiding thermal bridges and other weak points in the envelope are discussed. 300 - 400 mm insulation in the roof is recommended in relation to 200-300 mm wall insulation. Through-going cracks should be avoided by using more layers if batts are used. Special, efficiently insulated frames and non-metallic spacers for windows, and shutters insulated by a thickness of 30mm, can significantly reduce heat loss. Tips for achieving an airtight building envelope, especially with regard to lead-in of cables, pipes and ducts, are given. Painted concrete surfaces, puttered and painted lightweight concrete or rendered and painted brickwork contribute to airtightness. Joints between precast panels need sealing and cables etc. should be lead through slightly oversize holes (one for each) and a sealing mastic should then be applied. Framework constructions (often wooden) need and airtight barrier, preferably 0.2 mm of polyethylene. All joints should be of the squeezed-lap type. The polyethylene can be protected by being placed 40 - 50 mm behind the wall surface and covered by a layer of insulation provided that other layers of at least twice the thickness are placed on the cold side of the barrier. Lead-ins should have a backstop. At designated areas an extra board of plywood or gypsum is screwed to the other so that the plastic sheet is squeezed in between. After lead-in the sealing mastic can be applied. (AB) (124 refs.)}
place = {Denmark}
year = {1993}
month = {Dec}
}
title = {Low-energy constructions. Implementation of experience gained; Lavenergikonstruktioner; Implementering af erfaringer}
author = {Saxhof, B}
abstractNote = {The design of a thermal envelope for low-energy buildings is dealt with from the point of view of heat and moisture transfer. The report is based on experience gained in Danish low-energy house projects, primarily the Hjortekaer projects. Insulation materials and methods of avoiding thermal bridges and other weak points in the envelope are discussed. 300 - 400 mm insulation in the roof is recommended in relation to 200-300 mm wall insulation. Through-going cracks should be avoided by using more layers if batts are used. Special, efficiently insulated frames and non-metallic spacers for windows, and shutters insulated by a thickness of 30mm, can significantly reduce heat loss. Tips for achieving an airtight building envelope, especially with regard to lead-in of cables, pipes and ducts, are given. Painted concrete surfaces, puttered and painted lightweight concrete or rendered and painted brickwork contribute to airtightness. Joints between precast panels need sealing and cables etc. should be lead through slightly oversize holes (one for each) and a sealing mastic should then be applied. Framework constructions (often wooden) need and airtight barrier, preferably 0.2 mm of polyethylene. All joints should be of the squeezed-lap type. The polyethylene can be protected by being placed 40 - 50 mm behind the wall surface and covered by a layer of insulation provided that other layers of at least twice the thickness are placed on the cold side of the barrier. Lead-ins should have a backstop. At designated areas an extra board of plywood or gypsum is screwed to the other so that the plastic sheet is squeezed in between. After lead-in the sealing mastic can be applied. (AB) (124 refs.)}
place = {Denmark}
year = {1993}
month = {Dec}
}