I’ve got a 1950’s era Cape Cod in Maryland … roof was stripped to the planks about 3 years ago and the owner put 3-tab Tamkos on… 15 or 20 year I believe.
I’m just finishing up an addition and I want to do the whole house in 30 year architectural shingles. Its about a 30 square job… about 15 of it is in the existing roof.
Strip ’em… or go over top? Pros and cons?
Replies
My roofer has explained to me that if you go over the top the extra heat buildup wears out the new shingles 30% faster.
Not sure if that is a snooker job or not.
Wood is Good
Adam Greisz
I just had an almost identical conversation with my roofer. He will no longer put new comp over old.
There is really no good reason to overlay a new roof over whats there.
You'll only save a small amount now and sacrifice life expectancy on your new shingles if you do go over.
You can make sure that the old part has Ice and water protection to meet your desires when you remove the old roof.
Are there valleys where the addition meets the main house?
Hey Slateman...thanks for the help. I was afraid you'd say tear it off! I think that is what I need to hear though. Are there any valley's formed?... no, there are no valleys formed where the addition hits the house... but I did post a strange scenario to the "Construction Techniques" section titled "Vented wall flashing ... or regular wall flashing". It has some pics to explain. I'd love to have your thoughts on how to handle that too if you don't mind.
Tx-Ryan
Hi there. I'm new to the board. You may also want to check if the new shingles warranty will apply if they are used in a roof-over application. Up here in Ontario some shingle companies will not warrant a roof-over.
Dan