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For crying out loud just lay the shingles and leave it on as it has nothing --absolutly nothing to do with sticking, other than for shipping. If it is older shingles the tar strip is on top of the shingle so look where the tape ends up--has nothing to do with sticking down.. However if it should accidently stick to the top of the tar strip--yes it can on a rare occasion--then it MUST be removed.. Some newer shingles has the tar strip on the bottom of the shingles--thus it allows for a little more crooked runs, Then of course it would have to be removed from the bottom, and not the top. The tar on the bottom has just been introduced in the last year or so in our area. You did mention old shingles therefore a assumption is the tar strip is on top. We shingled a church a number of years ago and some one came with the idea they had to be stripped off, one heck of a argument, I ended up being the tie breaker and after showing them Everyone agreed that it would be imposible for it to have any ill effect. If you are not convinced call ANY shingle company or ANY lumber yard and they will put you straight. Second have you EVER seen any shingling crew take them off or EVER seen instructions on the package saying to take them off. Once in a blue moon a small chunk of the plastic will let loose in the wind and the other end may stick out the left or right side of the shingle, yea --- then tear it off. Another thing that does happen especialy if using old shingles or shingles that were stored in hot areas, is that part of the actual package -- especialy if wraped in paper will stick to the TOP of the tar strip--Again it HAS to come off. If you hired a crew to tear them off I can't imagine the cost factor involved. Once you get the package up on the roof drop the package over your knee or the peak of the roof (unless it is a cathederal ceiling--you will crack the plaster) to make the tar strips shift side ways to break them loose from each other, don't be gentle. I should mention to drop them face up so you do not scuff up the shingle in the package. If you use the LIFT OFF method you will many times tear the shingle, then it is pretty much shot or wasted. Leave them as a solid chunk for handling them till on the roof as it makes it much simpler to handle.
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