I’m building a new attached screen porch, and its roof will meet the house’s roof at the drip edge. Due to a very low pitch, the porch roof will have to be rubber membrane, which should go under the house’s shingles about 3’ to prevent leaks. There will be over 30’ to deal with. House pitch is 4/12.
The problem is, the house shingles are no longer made (Harbor Blue 3-tab), so I see three choices: Re-roof that slope of the house with Harbor Blue architectural (most expensive option); Re-roof as above but only the bottom 3’ (might look strange); or carefully remove the 3-tabs and re-use (risky). BTW, the shingles on this slope were all double-nailed due to bad wind exposure.
I’ve done the re-use option for small areas, but for this I’d like to have an easier method of popping the nails to reduce the chance of damaging the shingles, because I only have about 3 spare shingles left over.
I’ve thought of two improvements over the standard Wonder Bar approach. One is to use a small pneumatic grinder to grind the centers of the heads off (being careful not to grind the shingles) and lift the shingles off the nail shanks. Another is to take an old carpenter’s framing saw, grind off the teeth, and weld a hacksaw blade onto that edge. Then I could work the saw underneath the shingles and cut off the nails underneath.
Any thoughts on these ideas, or any better ideas? Thanks in advance!