When my house settles, will the foam crack and separate from the studs leaving an air void?
Any product that is misapplied will not perform as stated on the technical data sheets. This includes open celled foams which have the tendency to separate from surfaces in cold climates and form large air-pockets if off-ratio or if the surface is wet. With closed cell foams in all types of construction, both residential and commercial, elongation and tensile strength numbers are greater than that of sheet rock and actually helps reduce the impact (nail popping and drywall separation in truss uplift) in both cooling and heating environments. In both the NAHB and CCMC studies, the substrate actually separated from the studs while the foam remained intact retaining an air-tightness seal.
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