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DIY Home Repair Forum: Roofing and Siding 11-29-2007, 03:29 PM
Replies: 30
Views: 39,050
Posted By pgriz
Busyflyin, you will then have an under-insulated...

Busyflyin, you will then have an under-insulated and non-ventilated cathedral ceiling roof. Snow on top of the roof will melt due to the heat loss from the roof, run to the eaves and freeze, forming...
DIY Home Repair Forum: Roofing and Siding 11-28-2007, 07:11 PM
Replies: 30
Views: 39,050
Posted By pgriz
Busyflyin, we're not talking the same thing. ...

Busyflyin, we're not talking the same thing. First of all, a SIP panel does not give you anywhere near the R38-R40 of insulation you need in your roof system. So if you install a SIP panel over...
DIY Home Repair Forum: Roofing and Siding 11-27-2007, 05:18 PM
Replies: 30
Views: 39,050
Posted By pgriz
The code for minimum air channel is 2 inches. So...

The code for minimum air channel is 2 inches. So by putting 2 inch vertical battens, you satisfy that requirement. However, don't forget that the purpose of ventilation is 1) to dissipate residual...
DIY Home Repair Forum: Roofing and Siding 11-27-2007, 07:38 AM
Replies: 30
Views: 39,050
Posted By pgriz
Busyflyin, you have a beautiful cottage. If that...

Busyflyin, you have a beautiful cottage. If that was my place, I'd fill in the space between the rafters with blue styrofoam (5 1/2" should give you about R25-R30), install a vapour barrier across...
DIY Home Repair Forum: Roofing and Siding 11-22-2007, 05:26 PM
Replies: 30
Views: 39,050
Posted By pgriz
glennjanie, the reason I didn't mention the...

glennjanie, the reason I didn't mention the method is because it wouldn't actually deal with the issues that I brought up in my post.

Yes it can be done, but it won't provide adequate insulation,...
DIY Home Repair Forum: Roofing and Siding 11-22-2007, 08:17 AM
Replies: 30
Views: 39,050
Posted By pgriz
You probably need R38 or R40 for your...

You probably need R38 or R40 for your ceiling/roof. Depending on what kind of foam insulation you install, you get anywhere from R2 to R6 per inch. Fiberglas bats are usually around R3-R4. So your...
DIY Home Repair Forum: Roofing and Siding 11-19-2007, 02:24 PM
Replies: 3
Views: 2,114
Posted By pgriz
Ken, rent some scaffolding, and get yourself a...

Ken, rent some scaffolding, and get yourself a helper. Moving plywood by yourself on one ladder is suicide. Gravity can be so unforgiving. With a properly installed scaffold, you have a safe...
DIY Home Repair Forum: Roofing and Siding 11-17-2007, 04:54 PM
Replies: 19
Views: 19,359
Posted By pgriz
If there's an opening cut through the roof (vent,...

If there's an opening cut through the roof (vent, pipe stack, etc.), the cut is usually square, and it's possible to measure the thickness of an exposed edge.

Saw your photo, and the decking is...
DIY Home Repair Forum: Roofing and Siding 11-16-2007, 06:45 PM
Replies: 19
Views: 19,359
Posted By pgriz
It's probably getting late in the season, and...

It's probably getting late in the season, and don't know if you have already commited yourself, but...

It's not clear to me what kind of sheathing you have on your roof. Is it OSB or plywood, or...
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