29 Feb '12, 7pm

Cathedral ceiling rigid foam vents? #green

New construction -- having the attic trusses built with 18" top chord for insulation and baffles. Not totally sold on spray foam. The question is: doesn't building vents with foam or using plastic vents that are sealed to the truss create an area of condensation (it shouldn't condensate with that much insulation)? Or at least, in the event it did get wet, doesn't give it the ability to dry to the outside? The drywall inside will be sealed and there is only one roof penetration design for plumbing vent. Should I build vents that let the insulation breathe to the vent system?

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

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