Ok To End A Roof Into An Existing Wall

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.

Ok to end a roof into an existing wall.

As long as you use a roofing design that matches your existing roof you can use the same materials. That s a simple low cost solution that can tie in well with the main house. Remove existing siding and shingles at roof wall intersection. 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. Install liquid water proofing or peel and stick membrane on walls next to and beneath the end of the roof wall intersection. Cut two rafters with a circular saw to the pitch of the addition roof and nail them across the rafters on the old roof. Tear roof sheathing from supporting framing see figure 7 4 and rip roof framing from supporting walls.

Install step and kick out flashing at roof wall intersections. However if you build a porch roof with a peak larger than your existing roof check to make sure the that material can stand up to the pitch of your porch roof. 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. The exterior of a house presents plenty of opportunity for leaks.

Remove and repair any damaged siding and sheathing next to or beneath the roof wall intersection. You ll need to remove the existing shingles and cut. 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. They form an upside down v with the point at the top of the addition roof.

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. Pick roofing materials that match your existing roof. Then mount new trusses on the new addition walls. Butt the first new truss against the old one.