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High-performance wood-based panels substitute breathable membranes on external wall sheathings

Marquardt, H. and Mainka, G. W.
2001
Proceedings for Performance of Exterior Envelopes of Whole Buildings VIII: Integration of Building Envelopes, December 2-7, Clearwater Beach, Florida


Marquardt, H. and Mainka, G. W., (2001), "High-performance wood-based panels substitute breathable membranes on external wall sheathings", Proceedings for Performance of Exterior Envelopes of Whole Buildings VIII: Integration of Building Envelopes, December 2-7, Clearwater Beach, Florida.
Abstract:

External walls of timber-framed buildings get weather protection by a masonry veneer, a siding, or a rendering. In all cases, the external sheathing of the wall is usually covered by a breathable (i.e., airtight and liquid tight, but vapor open) membrane to protect the timber construction from wind-driven rain. Such a covering is also necessary to reduce the moisture in the wall due to high vapor transmission. Sheathings made of ? PUR/PDMI-bonded high-performance wood-based panels, such as oriented strand boards (OSB) or medium-density fiber-boards (MDF), or ? hydraulic-bonded low-density (800 kg/m3) calcium silicate boards (CSB) stop airflow through the wall°™they are water repellent and allow vapor transportation to escape from the interior. In these cases, the robustness of the design does not need a breathable membrane covering the whole sheathing but depends on good planning of all details as well as on good workmanship.


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Author Information and Other Publications Notes
Marquardt, H.
Helmut Marquardt is a professor in the Department of Civil Engineering, University of Applied Sciences, Buxtehude, Germany.
     
Mainka, G. W.
Institute for Building Construction and Building Physics, University of Rostock, Wismar, Germany.
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