In Reply to: Bracing: expansion foam posted by Harald on October 22, 2001 at 13:00:20:
When filling an unused chamber with expansion foam, one must be careful to avoid overfilling. The foam expands and can easily crack or even burst a panel. You can build up the chambers while they are open and can ensure that the foam is acting as expected during its curing process. Or you can drill holes and inject the foam into them, plugging the holes when you're done. The open method has the advantage of allowing you easy access, so you know when you're close to being done. The filler hole method is "blind", but you don't have to mount a panel over foam that has already started to set up.
Follow Ups: