Can You Get Foam Board Wet

Because of its resistance to moisture, foam board insulation is a great choice whenever and wherever there is a chance it could get wet, such as: an exterior foundation, inside a basement against the foundation, and on the outside of a house beneath a house wrap.

How long can foam board be exposed to weather?

If FOAMULAR® insulation is not covered immediately, it is recommended that it be covered within 60 days. When exposed for up to 60 days, gradual color fading and/or dusting of the surface may occur.

How do you protect styrofoam from rain?

The only way to be used as a vapor barrier is by preventing waterlogging. This is done by waterproofing the styrofoam using spray-on coating or plastic sheeting, but more on that later.