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Old 03-01-2008, 02:05 PM   #1
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Adding Insulation with Re-roof

I have a modular home with a 3-1/2 -12 roof pitch in northern Indiana. Straight 28X44 gabled roof with 18 year old original asphalt shingles. When I need to reroof I would like to add insulation over the existing roof. I have cathedral ceilings and scissor truss construction, so this is my only option to add insulation. Can anyone reccomend the best way to do this? I already have R-20 , but want more
Should I use Rigid foam? With furring strips or just long screws all the way through to the old roof?
Or the foil and bubble wrap type insulation?
Would I be better off to go over the insulation with plywood and shingles or metal roofing? What about venting? is it necessary if I go over existing roofing?
I don't have a preference except I want to do it myself and get the best bang for my buck$$$ ANY IDEAS ARE WELCOME


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Old 03-01-2008, 09:58 PM   #2
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Read through the following thread topic and see how much help that gives you first, please.

Then, come back and ask some more questions. The other situation is different from yours, but the same answers may apply.

Which is better? (Non-vented roof construction with indoor pool)



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Old 03-02-2008, 10:25 PM   #3
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you should vent the upper roof system,the original roof work work as a separator ,if you like,I feel you would be fine with insulating over the top with R-38 or better(or if you can afford it seal with closed cell insulation/super R-values),just be sure to leave room for proper venting channels,as well as venting,bathroom +dryer vents up to vent thru the upper roof so as not to create condensation problems----(ed call me)
"If it`s worth doing,It`s worth doing right!!"
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