Roof Leak Where Siding Wall Meets Roof Line

As each row of shingles is laid a step flashing is installed over the shingle next to the wall.

Roof leak where siding wall meets roof line.

See siding fiber cement gaps. Part of the flashing turns up on the wall and the other portion gets covered by the next row of shingles. You should only be able to see a tiny bit of the flashings if they were installed correctly. Some roof leaks happen at step flashings.

Part of the flashing turns up on the wall and the other portion gets covered by the next row of shingles. The intersection between a roof and a sidewall can be a rot problem waiting to happen. Roof leaks can ruin insulation become a breeding ground for black mold damage interior ceilings and walls and rot the wooden framing. Installation gaps in siding of any type if not back flashed invite leaks into the wall above left.

Some roof leaks happen at step flashings. When each row of shingles was installed a step flashing was put next to the wall over the shingle and then covered by the next shingle row. It is then running between the sheathing and siding until it gets to the top of the window. Even if the roof has been properly flashed against the sidewall this one hasn t water can still run down the side of the house and behind the siding causing rot.

At the point where a roof meets a vertical wall you will see step flashings. Improper installation of flashing where roofing shingles meet vinyl siding. Someone at the build site used sealant on an area where the roof meets the side of the house in an attempt to fix the issue. Improper installation of flashing where roofing shingles meet vinyl siding.

I made this video this morning and i hope it help explain the flashing wall detail where the siding meets the roof. Problem 2 water is entering the top of the window then running down the interior right side of the window frame. As each row of shingles is laid a step flashing is installed over the shingle next to the wall. And in our experience when a single piece of flashing extends only a few inches under the shingles especially on a long roof slope and worse on a roof that happens to slope slightly towards rather than away from the abutting vertical building wall the accumulated roof drainage water near the bottom end of the roof wall intersection will overwhelm the width of the flashing and because it is not directed back out on top of successive shingle courses it leaks into the building or building.

You find these flashings where a roof climbs alongside a vertical wall. The wall water has to be getting behind the siding along where the garage meets the house.