Spray foam insulation between rafters

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Author Message   Admin (Admin) New member Username: Admin Post Number: 1 Registered: 07-2006 Posted on Saturday, January 09, 2010 - 03:33 pm:        Put a styrofoam baffle under the roof deck before spraying the foam. This will prevent one side of the deck boards from being smothered and potentially cupping the boards. Wood shrinks and swells with the seasons, which is why both sides should have access to air. Joseph Jenkins, Inc.   Kc314 (Kc314) New member Username: Kc314 Post Number: 3 Registered: 01-2010 Posted on Friday, January 08, 2010 - 05:06 pm:        Absolutely, thanks.   Old_school (Old_school) Senior Member Username: Old_school Post Number: 372 Registered: 01-2009 Posted on Friday, January 08, 2010 - 03:36 pm:        It really shouldn't make any difference. Make sure and use wood decking and not OSB OR plywood for the nailing surface though   Kc314 (Kc314) New member Username: Kc314 Post Number: 2 Registered: 01-2010 Posted on Friday, January 08, 2010 - 01:49 pm:        Is there any reason not to use spray foam insulation beneath a slate roof? This is new construction, with the whole house using closed-cell foam insulation, and the attic will be a finished room. (Message edited by Kc314 on January 08, 2010)