It will take 8-24 hours for the spray foam to dry, depending on the type of spray foam, the temperature, and the relative humidity. There are many things that can come into play here. For example, I was doing some spray foam work about a year ago. It was in December and the relative humidity was around 25%. The average time it took for the spray foam to dry was around 15 hours.

Silky Terrier Dog Breed Playing Aro... Silky Terrier Dog Breed Playing Around

As always, you should follow the manufacturer’s recommendations when using any products.

Different types of spray foam have different cellular structures and as a result, they tend to dry at different rates. In other words, not all spray foams are created equal.

Most closed cell spray foam will take about 15-18 hours for the first layer to dry before you should apply the next layer.

8-10 hours is a general time frame for open cell foam to dry. Of course, this varies depending on temperature and relative humidity so again, always follow the manufacturer’s recommendations when using any products.

How long it takes for the spray foam to dry depends on many factors like temperature, humidity, and how thick the application is (single or double layer).

It can vary from 24 hours up to several days if there’s too much moisture in the air or if the temperature isn’t high enough.

Another determinant is the application method – foam gun vs. standard can.

Temperature and humidity levels should be at normal levels (not too cool or humid) to avoid condensation or frosting on the surface of the product while it is curing.

Spray Foam insulation systems typically require a 1/4″ thickness for proper application; exceeding this could result in long dry times, especially if done with a low-pressure spray system. 3) Always follow the manufacturer’s recommendations and never exceed 40 PSI when spraying foam insulation products. We have been able to achieve complete cure in as little as four hours with properly set up equipment under ideal conditions, but this may vary according to temperature, humidity, etc.