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Old 07-01-2012, 10:40 AM   #1
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Vaulted Ceiling - vents


In a small cottage there is a 2x6 t&g vaulted ceiling (about 4/12 pitch) Should it have roof vents? If so, what is recommended? Also, person wants to insulate, what is recommended here, styrofome on top between shingles and roof or inside? Thanks

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Old 07-03-2012, 04:51 AM   #2
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Vaulted Ceiling - vents


Insulating from the outside is your only chance to get enough insulation on that roof. Venting requirements depend on the structure of the roof assembly. Most likely you will want to have foam or densed packed cellulose on the inside and foam board on the outside. This assembly will not need venting.

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Old 07-03-2012, 05:39 AM   #3
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Vaulted Ceiling - vents


+1

In Canada, you are going to need a whole lot more R-Value in that assembly and much warmer roof rafters than can be provided by even if you have 2x12 framing.

The issue with even dense packing the rafter space (besides being a pain in the rear and near impossible to do properly with most roofs) is that it still does not address the thermal bridging of the framing.

This is where a nice large layer of rigid foam to the exterior has especially important application for cold areas of the world like Canada.
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Old 07-03-2012, 07:39 AM   #4
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Vaulted Ceiling - vents


I assume the interior side of the roof deck is exposed and finished? Around here we have laid down ice and water shield, 4" of XPS insulation, strapping from eave to ridge (for a ventilation space), plywood deck, tar paper, and then shingles. Ventilation is required as per building code. I've also seen similar systems without ventilation fail prematurely, and we've replaced them with the above setup.
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Old 07-03-2012, 07:41 AM   #5
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Vaulted Ceiling - vents


Quote:
Originally Posted by shazapple View Post
I assume the interior side of the roof deck is exposed and finished? Around here we have laid down ice and water shield, 4" of XPS insulation, strapping from eave to ridge (for a ventilation space), plywood deck, tar paper, and then shingles. Ventilation is required as per building code. I've also seen similar systems without ventilation fail prematurely, and we've replaced them with the above setup.
This is a great methodology right here.

I love above deck venting in cold climates.

Little bit more work but certainly makes for a cold roof and a nice moisture exit pathway.
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Old 07-03-2012, 09:08 AM   #6
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Vaulted Ceiling - vents


Thanks to all, great advice. Mark

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