Doors and Windows - Insulating newly installed window

I just installed a new Andersen Casement Window, on the inside can I insulate w/ Low Expansion Great Stuff, or should I also use Fiberglass Insulation? My objective is for weather insulation...

DAP window and door. Latex based, easy cleanup. Normally with the paint products, not in building materials. Blue can

I agree. I like to use the DAP foam if the gap is less than 1/2" wide... but the Great Stuff Door and Window foam if the gap is greater than 1/2".

The DAP is more user friendly if you get it on yourself or the window. The Great Stuff is bad news if it gets on anything. DAP foam works best when the can is fairly warm.

So Great Stuff can be used instead of Fiberglass Insulation? It is the weather side of the house...


Joe

You say the weather side, you mean its normally gets the wind and rain? Thats all taken care of by the window nailing flange, flashing tape (you did use tape right?), and exterior trim/siding/dripcap etc.

The spray foam, whatever type, will give better insulation than fiberglass since it seals to both the window frame and the house framing, if done correctly. It's not designed to prevent water penetration, its designed to insulate and prevent air infiltration.

Poking insulation in the crack tends to compress the insulation and reduces its effectiveness at insulating, so the Dap foam is a good agent for providing insulation.

Yes, I did caulk the nailing flange, I used flashing tape, and now for the interior finishing touch I want to be sure. It sounds like the foam is the right stuff. Thanks for all the input....


Joe