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We’ve fielded a lot of questions from builders who use housewrap air barriers, but wonder how these new mate-ials compare with felt paper when it comes to keeping water out of the walls. An expert in wood technology draws on his own research to explain how the properties of housewraps and felt...
Q: I am reroofing a flat roof framed with 2x10s on a house in Tucson. The foil-faced batt insulation was installed more than 25 years ago and seems very spotty, so I’d like to replace it while the roof is stripped. Winters are mild here, but the summer heat is brutal. I use both a/c and evaporative...
Q: Is it necessary to put housewrap behind vinyl siding on new construction?
Q: I’ve been using wood I-joists for my floor framing. The designs have called for 1x4 crush blocking inserted between the top and the bottom 2x2 flanges and nailed directly to the OSB web. I’ve also heard of using 2x4s nailed to the face of the 2x2s, instead of being inserted between them. Which...
Q: Since 1983, we have been using unvented crawlspaces under many of our energy-efficient housing projects. Our county has recently hired a new building inspector who is unfamiliar with this building practice and can find no provisions for it in the BOCA code. He would like us to provide evidence...
Selecting and sizing engineered-lumber beams
Calculating uniform loads on beams and headers
Are these two products really equivalent, as manufacturers and grading agencies claim? A wood technologist puts to rest questions about OSB’s suitability as an economical substitute for plywood.
While good-quality finish lumber has grown more scarce and expensive, the lumber industry has been developing wood-based engineered alternatives. Here’s an overview of the best options on the market today.
Q: I am having a problem that’s not uncommon in my area (north-central Florida). I recently built a nice custom deck for a customer who wouldn’t accept pressure-treated wood because of its appearance. I used kiln-dried southern pine 5/4x6. We primed all sides of the boards with oil-based primer...
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