Common Installation Issues
When it comes to call-backs about leaks, contractors are generally most worried about potential product defects. Instead, you should be much more concerned about installation issues, as forensic analysis finds that improper installation practices are the leading cause of leaks. According to water intrusion expert Gene Summy, president of TLS Labs, contractors can avoid “80-90% of litigation out there” by using the correct installation methods. These are some of the most common installation errors that lead to call-backs. 1. Improper Application of WRB Properly shingled house wrap is key to keeping the water out, but we often see WRBs installed with reverse laps. Instead of forming a continuous plane down the wall, reverse laps create a gap that allows water to flow under the WRB and onto the wall. To avoid this outcome, make sure that you always install WRBs from the bottom first, with each successive course lapping on top of the lower course. 2. Not Using Sealants AAMA window installation best practices specify the use of a sealant with self-adhesive flashings, but we still see failures from installers that don’t heed this advice. Sealant can fill small voids in OSB and other substrates, and improve the flashing’s bond to the surface, both of which will greatly reduce the risk of leaks. 3. Mixing and Matching Products As you learned in the previous chapter, adhesives and sealants from different manufacturers can have different chemical properties that are incompatible for use together. Sometimes this incompatibility can cause chemical reactions that lead to catastrophic product failure. We can’t say this enough…If you mix and match products from different manufacturers, it’s imperative to test their compatibility before installation.
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