Cons: Foam board insulation can be harder to install snugly in unusually shaped spaces, leaving gaps for air to flow. To create an effective air and moisture seal, you need to tape all seams ...

When cured, the waterproof sealant is mold and mildew ... As the name suggests, the adhesive is safe to use on extruded-foam insulation board. Tips for how to glue dissimilar materials are listed ...