Is there a pros and cons to installing new shingles over the old layer of shingles?
The biggest drawback to installing new shingles over old ones is that it will most likely void your warranty. That not withstanding, the old shingles will eventually show through the new ones (especially when you get some warm weather). If there are unusual shapes (curling, etc.) this could effect the performance of your new shingles Another disadvantage to installing new shingles over old ones is that you deprive yourself of the opportunity to inspect your sheeting.
This could prove to be a time and money saving endeavour because you could potentially catch a small problem before it becomes a big one The advantage is, of course, that you don't have to remove and dispose of old shingles. But as far as I can see, that advantage isn't worth it.
Dear Angie: We need a new roof. A builder suggested overlaying over the existing layer of shingles. Is it wise to do this?
My concern is how would we know about any underlying damage? I would appreciate any input about the pros and cons of this method. Dear Kim: In general, it is not good practice to overlay a traditional asphalt shingle roof versus a complete tear off and replacement for the very reason you stated: you can’t examine the decking to determine if there is any damage that needs repaired.
If you don’t take your roof down to the sheathing, you will never know if you have proper underlayment, or are experiencing sheathing rot, or ice or water damage. The best-case scenario for an overlay is sound decking; no previous or existing leaks; and a roof with no sidewalls where flashing is needed to tie in the roofing material to the exterior walls of the home.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.
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