![]() ![]() While more expensive than wood blocks, the slight additional cost of XtremeBlocks easily offsets the labor required to create a water-sealed, airtight penetration and provide a finished, professional look In addition, the installation of specialty mounting block can be done after mechanicals are installed, which solves trade sequencing problems.įor more on moisture intrusion prevention, go to. These molded plastic mounting blocks come in a variety of configurations with built in flanges, flashing and slope to protect against moisture and encourage proper water runoff. Best for Nail Holes DAP 12142, 32.0 Fl Oz, White SEE IT Photo: The strongest walls in a home will inevitably take a beating over the years, leaving pinholes, gashes, and rough. For best results, flash all penetrations first, and then install specially designed mounting blocks, such as Tamlyn XtremeBlocks. For all openings: Housewrap should only be slit so the opening can be flashed and the housewrap folded down over the flashing to avoid reverse shingling. ![]() Using drainable wraps in combination with flashing adds even more insurance against water damage.ģ. That means following ASTM E2112, which offers a guide for how to wrap window openings and install flashing. For square or rectangular holes: These holes should be wrapped and flashed the same way windows are handled for optimal moisture prevention. But the best practice is to use a liquid-applied sealant that comes in either a tube or brush-on application that will seal out water and air in one application.Ģ. A better way is to use a flexible flashing that can stretch around the pipe for a tighter seal. Install a second half-moon of flexible tape above the pipe, lapping the ends over the half-moon below and tape the seams. Next, install flexible flashing tape in a half moon below the pipe, overlapping the housewrap. ![]() When using this method, first cut a flap in the housewrap above the pipe and fold it up out of the way. The good approach is to use a flexible flashing tape. There’s a good, better, best approach for these penetrations. For circular penetrations: Circular holes for HVAC and other hose or pipe penetrations require a different approach to wrapping and flashing because of their shape. Here are three best practices for properly sealing wall penetrations - and preventing mold:ġ. ![]()
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