Ok To End A Roof Into An Existing Wall

The exterior of a house presents plenty of opportunity for leaks.

Ok to end a roof into an existing wall.

Tying in to an existing gable roof tie into the end of an existing gable roof by removing existing facing boards wall siding and any other obstructions back to the first truss of the old roof. Remove existing siding and shingles at roof wall intersection. Tear roof sheathing from supporting framing see figure 7 4 and rip roof framing from supporting walls. The up slope end of a simple shed roof that rests near the eaves of an existing roof can usually be supported by the rafters of the old roof.

That s a simple low cost solution that can tie in well with the main house. 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. Remove and repair any damaged siding and sheathing next to or beneath the roof wall intersection. Then mount new trusses on the new addition walls.

Butt the first new truss against the old one. Pick roofing materials that match your existing roof. As long as you use a roofing design that matches your existing roof you can use the same materials. Cut two rafters with a circular saw to the pitch of the addition roof and nail them across the rafters on the old roof.

You ll need to remove the existing shingles and cut. Install liquid water proofing or peel and stick membrane on walls next to and beneath the end of the roof wall intersection. They form an upside down v with the point at the top of the addition roof. The flat roofing material must go up the wall a minimum of 12 or up the wall and over the top of the wall if the wall is less than 12 high.

A common problem area is the point where a gutter dies into an adjoining wall as the photo below illustrates. Yes even flat roof to wall intersections are not being properly done. Unless you re careful step flashing can allow water from the roof to slip behind the gutter and get behind the siding and even the housewrap. Install step and kick out flashing at roof wall intersections.