On 13 Jul 2005 13:50:37 -0700, in alt.home.repair Why remove only
one layer of shingles. wrote:

I need to have new shingles on my roof. There are two layers of three
tab shingles on there now. The roofer indicates that he will remove
one layer and then reshingle. Don't I need both layers removed. The
cost can't be that much more to remove the second layer. I have a
simple 1200 sq ft ranch 40 years old. What are the thoughts?

Very bad idea.

Remove everything down to the decking. You need to do that in order to
inspect the condition of the decking, and provide a good underlayment
for the new shingles. I would also install 30# felt under the new
shingles unless the mfg instructions preclude it.

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