Replies

1. 
   Stuart Fearn | Jan 22, 2011 10:02am | #1

   Usually spray foam insulation is not used directly up against windows, either open or closed cell. Exceptions would be a fixed, not moving parts window, where the gap between the rough opening framing and the window frame is large.
   A specific foam to seal around doors and windows is a single component foam designed to be low expansion and easily dispensed from a can. I use Hilti door and window foam. Other brands are Dap, Great Stuff, and many others.

2. 
   Riversong | Jan 22, 2011 05:37pm | #2

   the pros and cons of using open cell insulation and closed cell spray foam insulation

   Open cell is a form of polyurethane spray foam insulation that is installed at a typical density of 0.5 pcf, and closed cell is another form of polyurethane spray foam insulation that is installed at a typical density of 2.0 pcf. Open cell has a typical R-value of 3.4/inch while closed cell is typically 6.5/inch. Open cell is somewhat vapor open while closed cell is a vapor barrier.

   They are used only for insulating large volume areas, not window openings.