Ecohome: Overview Of Weather Barriers
Ecohome describes features, benefits and considerations for weather barriers (or more accurately water-resistive barriers) that keep bulk water away from vulnerable building components and allow walls to dry at the same time.
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GBA: Spray-On Water-Resistive Barriers
Green Building Advisor describes spray-on water-resistive barriers that protect wall sheathing with a waterproof, airtight coating that still allows a wall to dry to the exterior.
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IRC: Vapor & Air Permeances Of Building Membranes
Canadian Institute for Research in Construction paper describes water vapor permeance, air permeance, and water absorption coefficient for 18 building membranes found in North American markets. (PDF)
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BC Housing: Defining Performance Of Water Resistive Barriers
BC Housing research paper on Defining Performance of Water Resistive Barriers examines various aspects of sheathing membrane performance including measuring drainage and moisture retention capability, permeance of weathered materials, and long term performance in context of chemical leaching from stucco or wood-based products. (PDF)
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Building Science: Stuck On You, Leaks Through Building Paper & Wraps
Building Science says one of the dirty little secrets that never gets talked about is that water leaks through building papers, building wraps and housewraps and runs down between them and the sheathings that they cover. The good news is that the nail holes and staple holes don't leak too much and we know how to handle the incidental leakage.
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Construction Specifier: Durability Of Liquid Applied Water-Resistive Barriers
Construction Specifier describes results of a study that evaluated performance of 17 fluid applied weather resistive barriers (new and old) that were tested in various common construction details, along with accessory products (flashings, tapes, and sealants). This long-term study is ongoing, but has already yielded important observations.
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GBA: Housewrap Tape Problems
Green Building Advisor says when used to tape horizontal seams, housewrap tape can contribute to water entry problems.
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RCI: Fasteners & Self-Sealability Of Weather-Resistive Barriers
RCI technical advisory Fasteners & Self-Sealability Of Weather-Resistive Barriers says while lab tests demonstrate the ability of properly installed fasteners to seal to some extent where they penetrate air barriers, penetrations can become sources of water intrusion, depending on many variables. Use air barriers that are fully and independently qualified as water-resistive barriers to diminish the risk of water penetration through fasteners. (PDF)
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