how to re-roof?

Old 05-26-05, 03:32 PM
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how to re-roof?

I have an old out-building with one layer of 3 tab asphalt shingles. The shingles are very old and brittle and have a lot of fungus stuff on them. What's the best method to re-roof? Should I strip off the shingles, shingle over the existing or lay down plywood and put the new shingles over the plywood? Thanks.
Old 05-26-05, 04:26 PM
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If the old shingles are laying flat, you can apply another layer over the top. But if the edges are curled up at all, I'd recommend tearing them off. Any irregularities will be telegraphed to the surface of the new shingles, and may prevent them from sealing down properly. Once you tearoff, you will be able to assess the decking, and see if there are any rotton spots, but it's likely that if you currently have 3 tabs, you don't need another layer of plywood. Once you have the roof torn off, apply new felt paper. It's also a good time to replace the roof edging (gutter apron at the bottom, drip edge along the rakes.)

have fun!
Old 05-26-05, 04:40 PM
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tear off and reroof if it was my house, extra work but worth it.
Old 06-13-05, 01:52 PM
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Being it's just an Old Out House,just take off the old roofing materials and
lay down new plywood.Some old cedar looking shakes would look nice,or even ternplate?Try using the newer cementious cedar shake looking materials?

Last edited by twelvepole; 06-19-05 at 02:23 PM. Reason: Signature Edited; No Advertising or Contact Information Allowed in Forums

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