News — sfww

Spray Foam Substrate Moisture and RH Testing

Posted by Randy Isaac on

Spray Foam Substrate Moisture and RH Testing

Substrate Preparation SPF can be sprayed on wood, concrete, metal, asphalt, foam sheathing, and other substrates. But the substrate needs to be clean and dry — “paintable” is a reasonable benchmark — for the foam to adhere well. SPF shouldn’t be installed when temperature and humidity levels fall outside the range recommended by the SPF manufacturer. Moisture. When a surface is wet or damp, the moisture acts as a blowing agent that reacts with the “A” side of the SPF system, resulting in off-ratio foam with poor physical properties and poor adhesion. When the foam is sprayed on wet framing...

Read more →