I went to replace all of the pipe for a pellet stove insert and discovered that the installer did a poor job of following any of the manufacturer’s guidelines for rise on the pipe or the appropriate thimble usage. I now have a 14” x 14” hole that accommodated a gas stove thimble and is lower than necessary.
I need to raise the opening ~4” and reduce the size to a 7x7 roughed in opening for the appropriate thimble.
I was going to pull some siding from above to place on the lower portion of the wall and raise the rest of the siding up incrementally, and retain the outside appearance of the same size opening (yet framed in smaller behind with a sheet of aluminum with a cutout for the thimble, but the sheets don’t line up to accommodate that.
The roughed in framing and moving the opening up isn’t an issue for me. Trying to determine how to finish the outside without looking dumb and provide a water/airtight finish.
No availability for the type of siding that was used (no extra and no longer made).