Are you a subscriber but don’t have an online account?

Register for full online access.

 
 
 
 

More stories about Q%26A

  • Q&A: Fogging for Mold?

    Q: I've come across a product that was created to combat the anthrax spore and was later found to be effective against mold as well. It's fogged throughout the job for 24 hours, with no access allowed. The product is said to eradicate mold, not just put it in a dormant state. Does this work?

  • Sealer Failure on Saltillo Tiles

    A past customer purchased Mexican Saltillo tile from a distributor and had it installed by a tile installer I referred her to. The tile came presealed and was installed - per instructions on the shipping boxes - using thinset mortar. Within a day or two, the sealer began to fail, appearing as a...

  • Can Fiberglass Batts Perform Well in Tightly Sealed Houses?

    I understand that fiberglass batt insulation can allow air to move through it and that this air movement degrades the insulation's R-value. Two causes I've heard about are wind-washing at the eaves and convective loops that can start in a wall cavity on really cold days and wick warmth from inside...

  • Wood-Steel Composite Beam?

    We're considering through-bolting LVL lumber to both sides of a steel I-beam. We'd install the resulting composite beam flush at midspan in an existing floor system, with the LVL providing convenient nailing for joist hangers. Can we assume that the combined load-bearing values for LVL and steel...

  • Wrong-Side Housewrap

    While preparing for an extensive remodeling project, we discovered that the housewrap was installed underneath the exterior 7/16-inch plywood rather than on top. According to the scope of work, we are supposed to install 1/2-inch foam board with taped seams over the entire exterior. Will the...

  • Best Mix for Pumped Concrete

    Plans for an infill project call for a poured stem-wall foundation, but the urban site has limited access for a regular concrete truck. A pumper truck would be ideal, but I'm concerned that the pumped mix won't provide the required 4,000-psi concrete. Is this a legitimate concern?

  • Unvented Roofs and Shingle Warranties

    While the IRC has approved the use of certain "hot" unvented attics, it seems that asphalt-shingle manufacturers still recommend that their shingles be installed over vented roof assemblies. Does this mean that shingle manufacturers will void their warranties if the roof deck is insulated with...

  • Metal Connectors and Galvanized Coatings

    Can standard galvanized Simpson STHD strap-tie hold-downs be used in contact with ACQ plates and framing? We've been schooled by our local building officials to avoid placing anything but stainless steel or heavy-duty hot-dipped galvanized metal connectors in contact with ACQ lumber, but these...

  • Trowel-Applied Membranes

    Are the new trowel-applied membranes used for waterproofing showers as good as sheet membranes? Are some better than others?

  • Back-Priming Fiber-Cement Siding

    Q: We ordered preprimed HardiePlank lap siding to finish a project, but when it was delivered, we discovered that the backs were left unprimed. Normally, we back-prime wood clapboards, but I'm not sure this step is needed with fiber-cement siding, and the manufacturer's Web site is mute on the...