My goal for a new roof is to put as light a load as I can on the roof while using the good looking architectural shingles. I have three layers on the roof now and have problems in the house which could be caused by having such a heavy roof. I had a structural engineer evaluate the situation and recommended a new roof and I totally agree. The previous owner of the home put the third layer on.
I'm seeing how heavy some of the architectural shingles can be. For example 'GAF-Elk Timberline Prestique Lifetime' weigh in at 337 lbs per square and 'Tamko Heritage Vintage' are 390 lbs per square. There are lighter architectural shingles but are they as considered as good a bet in terms of durability as the heavier ones? Two of these lighter laminated/architectural shingles are IKO Cambridge 30 AR and Atlas Pinnacle which weigh in at 236 and 223 lbs per square respectively.
If we go 20 or so years into the future when whatever shingles I have installed wear out then would it ever be acceptable to put another layer on top of an existing layer of worn out architectural shingles? As a percentage of total cost how much more expensive is a roof job when it's a tear down vs. putting on a second layer?
Thank you for your comments.
I'm seeing how heavy some of the architectural shingles can be. For example 'GAF-Elk Timberline Prestique Lifetime' weigh in at 337 lbs per square and 'Tamko Heritage Vintage' are 390 lbs per square. There are lighter architectural shingles but are they as considered as good a bet in terms of durability as the heavier ones? Two of these lighter laminated/architectural shingles are IKO Cambridge 30 AR and Atlas Pinnacle which weigh in at 236 and 223 lbs per square respectively.
If we go 20 or so years into the future when whatever shingles I have installed wear out then would it ever be acceptable to put another layer on top of an existing layer of worn out architectural shingles? As a percentage of total cost how much more expensive is a roof job when it's a tear down vs. putting on a second layer?
Thank you for your comments.