Framing Rafters Into Existing Roof For A Covered Porch

Sheathing 1 2 inch plywood or osb is nailed to the rafters.

Framing rafters into existing roof for a covered porch.

The ledger should be attached before the foundation is built for a deck patio roof posts and other structure. To keep the porch roof framing as simple as possible we installed a structural ridge supported by posts at each end with the common rafters landing on top of the ridge. Above the top of the trusses. After installing the rafters we still had to extend the porch roof back over the shed roof creating a valley on either side.

Blind valleys simplify framing. Draw the plan of you porch roof and make calculations. Locating and mounting the ledger is normally a fairly easy process. When building a porch roof asphalt shingles or other roofing material are then attached over the roofing paper and drip edge.

The framing should be exactly 3 4 in. The porch roof may match the pitch of your home or have a more shallow roof pitch. In the case of a lean to roof over an addition the existing rafters will have to be cut away to accommodate the addition and the shed roof will require support where it ties into the framing of. Use screws to secure the rafter to the sill plate.

Make a cutting on one of the sides of the horizontal roof beam on an angle. Screw the roof plates through the roof boards into the rafters below. Position the rafters on top of the sill plate. Trim the angle to fit and screw the ridge rafter to the first truss and roof plates.

The new ridge will tie into the existing roof as a hip and valley offshoot. The ledger typically a 2 by 6 is usually designed to hold one end of the patio roof rafters. In this case the homeowners wanted a covered porch added to the rear of their house. Complete the tie in by installing a pair of rafters.

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You have to do it thoroughly so that the rafters sit flush on it. Shown is the new rafter system of the porch. After that to make it flush with the roof of the existing house cut the two outer rafters. Then attach drip edge over the roofing paper.

Attach the horizontal beam by using a nail gun. Accurate and detailed plan and is crucial to building a durable and good looking porch roof. Next measure for the ridge estimate the angle and cut it a little long.