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Asphalt shingle replacement, stop those roof leaks!

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Step 6: Install new tarpaper

Picture of Install new tarpaper
This photo shows me sliding  new 30# tarpaper under the existing tarpaper. You want to install new tarpaper as far up the roof as possible, under the area where the new shingles will be placed. The 30# stuff is stiff enough to do this, 15# may not work.