Second layer of shingles question

harold14370July 23, 2009

I want to put a second layer of shingles on my garage roof. Can someone explain the proper technique? In particular, I think it will be best to align the top of each shingle in the second layer with the bottom of the tab of a shingle in the first layer. This will allow them to lay as flat as possible. However the first course will be less than a tab height - maybe 4 inches high instead of 5 inches - because of the way the shingles overlap. Is that the way it is supposed to be done?

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The new shingles need to be installed as indicated by the manufacturer's instructions and without regard to how the shingles below have been already applied.

    Bookmark   July 25, 2009 at 8:05AM
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Okay. Thanks.

    Bookmark   July 25, 2009 at 5:21PM
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Better off stripping it now. Way bigger pain later with 2 layers.

    Bookmark   July 27, 2009 at 1:36PM
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I agree with rjoh
Stripping down to decking installing ice sheild (if required) and new tar paper with single layer will last longer.
Not only is the overall roof lighter, imagine if the first layer buckles and ruins your new roof?

    Bookmark   July 27, 2009 at 9:00PM
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