Air and Weather-Resistive Barriers

What’s New with Water-Resistive Barriers

Posted on January 31,2015 by AlexWilson in 475

I remember years ago — I hate to remember how many; it must have been around 1982 or 1983 — writing for New England Builder (now the Journal of Light Construction) about Tyvek housewrap. It was then a fairly new product — and really a new idea: a material that would wrap over the outside of a house to provide an air barrier and improve energy performance.

Green Basics Air Barriers

Where Does the Housewrap Go?

Posted on January 31,2015 by user-756436 in drainage plane

Let’s say you’re building a house with plywood or OSB sheathing. You plan to install 2 or 4 inches of rigid foam on the exterior of the wall sheathing, followed by vertical rainscreen strapping and siding. Where does the housewrap go? Depending on who you talk to, you get two different answers:

  • It goes between the rigid foam and the vertical strapping, or
  • It goes between the sheathing and the rigid foam.

Deep Energy Retrofit: Apply the Energy Efficiency Pyramid

Posted on January 31,2015 by ChrisBriley in deep energy retrofit

This is the last installment in the Green Architects' Lounge trilogy on deep energy retrofits. In this episode, Phil and I discuss the importance of sizing your new HVAC system to the heat load of your newly renovated house. (This is where that energy audit information, which we mentioned in previous episodes, is going to come in handy.)

Architects Talking About Air Barriers

Posted on January 31,2015 by ChrisBriley in air barrier

With cocktails in their hands, architects Chris Briley and Phil Kaplan discuss green building and design issues in a casual, pithy format Join the guys for a drink as Chris and Phil look at air barriers — one of “The Big Three” topics (along with insulation and windows) of green construction. Sit back, relax, and be “edutained” — while you work, drive, exercise or do whatever you do while you podcatch.

Keep Slabs Dry

Posted on January 31,2015 by Peterbilt in Foundation

**Provide a capillary break between the slab and the soil.**

Ground moisture entering a building not only corrodes metal, but also causes fungi and bacteria growth. Groundwater and vapor pass through a concrete slab in several ways: a rising water table, capillary action, diffusion of water vapor through concrete, and as moisture-laden air through gaps or air ducts located beneath the slab. (For this reason, do not locate ducts beneath slabs.)

Install a drainage plane behind the exterior cladding

Posted on January 31,2015 by Peterbilt in Balconies

**A drainage plane, or water-resistive barrier (WRB), is a continuous, water-repellent layer behind the cladding that intercepts bulk water and drains it away from the assembly.** Install a drainage plane with an air space behind siding, brick, stucco, or stone. Make the drainage plane continuous by either lapping the material shingle-style or by taping the seams.

Environment Building News New Standard Puts Air Barriers to the Test
Environment Building News Delta-Dry Takes New Approach to Housewrap
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