Does anyone have a good procedure for installing a roof vent through a asphalt shingle roof? I'm going to a 2" vent with a metal/rubber vent flashing. It's cutting the hole that I'm concerned about getting it in the right spot relative to the shingles.
I would think the best way would be to drill a small hole from the underside that just goes through the wood only; tricky I know. Then poke something in the hole to push up the shingles. Then you can see where that hole is and adjust so that a 2" hole would just under the edge of a row of shingles. Now where to cut from for the two++ inch hole??? Try and remove some shingles and get down to the felt and cut it from the top?? It will top out here in MN at 48 today so the shingles won't be that soft and only colder and rainy/sleety(so I must get it right the first time) for the near future.
I would think the best way would be to drill a small hole from the underside that just goes through the wood only; tricky I know. Then poke something in the hole to push up the shingles. Then you can see where that hole is and adjust so that a 2" hole would just under the edge of a row of shingles. Now where to cut from for the two++ inch hole??? Try and remove some shingles and get down to the felt and cut it from the top?? It will top out here in MN at 48 today so the shingles won't be that soft and only colder and rainy/sleety(so I must get it right the first time) for the near future.