13 May '13, 5pm

Can exterior exterior foam be combined with interior spray foam? #green

If I have walls and/or an unvented cathedral ceiling that are insulated with closed-cell spray foam from the inside, can I also have rigid foam on the outside of the sheathing to limit bridging? Just wondering if it's somehow a bad idea to have the sheathing sandwiched between two layers of foam. Thanks, Chris. (This is for Ottawa, Canada, equivalent to zone 6A.)

Full article: http://www.greenbuildingadvisor.com/community/forum/green...

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