Compromised insulation means that the home will not be properly heated or cooled and the shingle warranty after spray foam attic insulation will be voided. This is a common mistake made by inexperienced installers: missing the air leakage site can compromise the integrity of the insulation. Spray foam installers missed some of the air leakage sites But without the knowledge and experience that’s required of an experienced spray foam installer, you will inevitably compromise insulation. However, open cell foam should fill the entire framing cavity, therefore making it easier to determine whether the installer has sprayed enough.ĭepending on the type of spray foam you get, you may be able to determine how thick, or thin, to apply the spray foam. It doesn’t fill the cavity, though, so spot checks may be required to check you don’t get shorted.
#Drip guard verses insulation in pole barn roofs code#
Closed cell foam has a higher R-value per inch, and installers generally spray 2″ in walls and 3″ in roof lines to meet the energy code requirements of R-13 and R-19, respectively. As noted above, there are two types of spray foam, and each has a different insulation value. This requires a bit of a technical explanation. Spray foam can contract and pull away from framing. Spray foam installers didn’t understand the building envelope and either sprayed too little or too much. Spray foam installers missed several of the air leakage sites. If CertainTeed is going to give warranty so is Owens Corning, up to a point.īut even though spray foam has a huge number of benefits - and is, in fact, the preferred insulation of today’s modern contractors - there are a few pitfalls that are common with spray foam insulation, including: Owens Corning, on the other hand, is a big boy and must be competitive in all situations. Atlas does not produce any attic foam insulation and has no reason other than CertainTeed and Owens Corning warranties to contend with. What about Atlas? Atlas is one of the smaller players in a big game and they do not have a so-called dog in the hunt. CertainTeed makes a foam attic insulation so they would have a hard time voiding a warranty on their roofing shingles due to another product that they sell. Why do some shingle companies extend the warranty and others do not? Simple, it’s all about the money.
Owens Corning has limitations on their shingle warranty and CertainTeed pretty much warrants all their shingles after spray foam insulation. The last bulletin I read from Atlas Roofing Corporation is that any improperly vented attic will void any warranty from Atlas. You can now see a few reasons that some roofing shingle manufacturers void your warranty if you add spray foam attic insulation.
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