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How to patch a hole in a roof left over from a chimney removal.

How to patch a hole in a roof left over from a chimney removal.

Old 02-27-18, 10:43 AM
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How to patch a hole in a roof left over from a chimney removal.

Good afternoon,

I have been doing some research for a couple days and watching a bunch of videos on how to patch up a hole in a roof that is left over from a chimney removal. I got some help on removing the chimney and sheetrock from another thread I posted here.

Link to the previous post: Need advice/confirmation on cutting a plasterboard wall and bulk head out.

So now I am left over with patching up the 18" by 18" hole in the roof. Here is the workflow I came up with. Please chime in with any thoughts.

1. Remove the flashing that was previously on the chimney.
2. Remove the surrounding shingles that were cut to butt up against the chimney. Somewhere in the amount of two to three sheets if I want the sheets to evenly line back up. I might have to cut the replacement shingles to make them work.
3. Use some deck screws to install four 2x4's of pine stud from Lowe's to the existing wood around the inside of the hole. These supports will be used to hold the piece of plywood or OSB that will be around 18" x 18". I have been reading a lot about plywood vs OSB, I think plywood is the way to go.
4. Nail down the plywood to the supports. I don't think I need to put any caulk around the small gap between the roof plywood and the existing plywood. I am thinking it can't hurt. I bought some NPC solar seal #900 to put in that crack. Not sure if that is the best idea or not.
5. Apply the ice/water shield. The supply store wanted $61 for an entire roll, so I was going to try and find a couple pieces somewhere around town. I have not been able to find too much information about this. I am assuming that I should put this on top of the existing ice/water shield, but I am not sure if I need to put some tape or or solar seal #900 around the edge of the new piece to keep it from having a gap between the old an new pieces. I would assume a tape of some sorts is needed, but I haven't been able to confirm that. Maybe you just staple it down. I could use some advice here.
6. Nail down the new shingle sheets with the same pattern that is there now.
7. This shingles are self sealing, so I think you just pull the protective tape off of the sticky side and wait for a hot day to melt them together.
8. Done.

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