How Is Flashig Attached Behind Siding

Q last year i added a room to the back of our house and ever since have had trouble with roof leaks from where the flat roof on the new extension meets the existing wall of the house.

How is flashig attached behind siding.

Inside corner w flashing. Above a lower roof where it abuts the wall. Under the eaves of a roof with little overhang and no gutters. If the shingle already has flashing on it the kickout flashing has to slip beneath it and you ll have to loosen or remove siding to do this.

The old siding does not overlap the foundation like normal. But unlike fiber cement siding wood is almost sure to rot. In all cases make sure to detail the flashing membrane so that it sheds water. Currently there is no flashing b w the siding foundation but my concern is that flashing should be there to direct water away from the sill plate.

Slip the back flashing under the siding at least 3 at the top and the sides. That should pop the nail head out far enough so you can pry it out. The recommended width of step flashings will vary depending on the agency entity being referenced. A common problem with cement board siding products and some other types of horizontal lap siding is that older installation guidelines called for caulking the joint instead of flashing the joint.

If the sidewall is stucco or solid wood like ours and you can t open it to get flashing behind it continue the step flashing to the peak of the roof then cover the step flashing with cap flashing photo 2. Instead the outside edge recessed about 1 2 from the edge of the foundation. If nails are in the way pull them out. It should tuck under the sheathing wrap above and over the flashing below.

This has proven problematic over time as caulking the joint results in unsightly surface appearances due to the different textures as well as resulted in failure of the caulk joint and associated. I m afraid that with time that rain is going to find its way between the roof and the wall and. Where an attached backyard deck meets the house. You may need to pry out siding first.

When it comes to flashing siding corners many builders simply use a 1x wood corner. Pry the siding out near a nail then push the pry bar against the nail as you partially tap the siding back in. This results in a 2 inch minimum head lap. The recommended length of step flashing is typically a minimum of 2 inches longer than the exposure of the roofing material.

However i question what to do at the bottom. The part of the house that it is attached to is wood lap siding.