Wood Porch Roof Framing Details

And the line length measurement from the roof peak to the building wall is the hypotenuse.

Wood porch roof framing details.

Flat roofs are more susceptible to leaking than pitched roofs. Building a porch roof requires basic carpentry and porch roof framing knowledge. Measure down the thickness of the decking plus the width of the joists and support beams. Mark the width of the deck on the house as well to help you position the frame later.

This notes the top of the posts. The rise or height of the roof at its peak is the altitude of the triangle. Per foot this is called a 5 12 slope and extended 18 in. The house roof sloped 5 in.

We show you how both a typical rafter style porch and truss roof area constructed. Within limitations which include among others building size roof. If you are tying the roof directly to a house wall you can install a ledger board with flashing and install rafter ties to attach the rafters at the appropriate angles or use engineered trusses. This is known as prescriptive framing.

These illustrations above show the plans for the screened in porch deck framing gable framing ledger truss block side walls and the end wall. The roof deck surface should sloped away from the house a minimum 1 8 inch per foot so the water will. Details for conventional wood frame construction the first approach to achieving a strong durable struc ture involving economical use of materials is to follow a. Conventional light frame wood structures may be built without the need for engineering analysis of each component.

Porch depth footing size beam size max beam span rafter size post size 10ft 18 sq x 1 d 4x8 10ft 2x6 24 o c. The provisions for prescriptive roof construction are found in chapter 8 of the irc and in section 2308 of the ibc. Careful detailing of membrane roofs at corners doorways and penetrations is critical for long term performance. Photo by dave holbrook.

The deck should be below the door threshold to keep water out of the house. 12ft 2 sq x 1 d 4x8 10ft 2x8 24 o c. All wood to be 2 douglas fir or better. Epdm is the best choice for most rooftop decks.

The run or half the building span is the base of the triangle. The details were adapted from figures in the apa publication the advanced framing construction guide form m400 which highlights construction. Shed roofs project as a single plane roof pitched away from the house. The framing of a basic gable roof is based on a right angle triangle and the various roof framing components fit the triangle.

Some key details for a leakproof rooftop deck are. Your roof may vary from this and the details of how the porch ties in will vary as well.