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cathedral ceiling Post New Topic | Post Reply
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thomas malloy
Posted: May 09, 2008 02:28 PM
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cathedral ceiling
what is the best product to use open cell or closed cell and should i be concerned with venting, also there will be a 2'air space from the insulation to the gyprock does this matter.if anyone has experience with this type of application would love to hear fron you. PS i live in nova scotia.don't know if that matters or not
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mason
Posted: May 10, 2008 09:32 AM
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The SPF industry recommends nonvented attics and cathedral ceilings when using SPF to the underside of roof decks. The small space between the drywall and the foam should not condense so long as there is sufficient thickness of foam to separate the inside and outside temperature. It does matter that you are in Nova Scotia. In colder climates, open cell foam will require a vapor retarder element to reduce the amount of moisture into the foam. Check with your supplier for their recommendations and ask for a hygrothermal modeling study performed for your region on the proposed design. |
