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Green Building Techniques

  • Question & Answers

    Why isn’t porcelain cladding common ?

    Most porcelain, from wood-look planks to large format stone-look tiles, are impervious to moisture and are insect proof, rot proof, frost proof, fireproof, and highly UV fade resistant.  All these…

  • Question & Answers

    Cuts in Foundation Drainage Board

    My contractors installed drain board over the foundation membrane before doing the below grade penetrations.  So now they are cutting flaps in the drain board to seal the penetrations before…

  • Question & Answers

    Alternatives to Rigid Insulation on Exterior on Existing Walls

    I work on a lot of renovation projects (in Montana, Climate Zone 6B) where we need to add insulation to exterior walls and I typically spec 2-3" of rigid mineral…

  • Question & Answers

    Leveling an Existing Slab Foundation

    I will be installing some rigid foam and two layers of plywood over an existing concrete slab to create a wood floor. I know this subject has been covered at…

  • Question & Answers

    Insulating a roof, FH issue 299

    As I read Josh Salinger's article in the July issue I'm questioning the installation of the WRB on top of the roof rafters to create a 1.5" air gap for…

  • Question & Answers

    How to Locate Windows for Optimal Shading

    When we design new homes, we do shading studies of every window. This tells us the lowest point on any given wall that we will allow the bottom of a…

  • Question & Answers

    Adding Exterior Polyiso Foam Insulation to Zip Sheathing

    Hello all, I am currently building a home employing some techniques I've learned here. For insulation, I put R20 closed cell under basement slab and garage slab, R20 continues up…

  • Question & Answers

    Insulation at Attic Floor vs. Roof Line

    My 15x30 cabin has R15 (3 inches of foam) on the exterior. This continues up to the attic. I put in raised heels to allow for venting without constricting the…

  • Question & Answers

    Fixing Wrong Window Buck Depth

    In the flurry of issues this spring with sourcing our Rockwool and answering questions for our carpenters, I sized the depth of our window bucks at the face of our…

  • Question & Answers

    Poly Sheeting for Air Barrier

    The attic in the house I'm building is vented and entirely out of the conditioned space. As such, I need to be very careful about the ceiling and how well…