Porch Hip Roof Framing Details

American forest paper association wood construction data 1.

Porch hip roof framing details.

The rise or height of the roof at its peak is the altitude of the triangle. As you can see the truss angles are constructed to maintain the same slope. Place the 4 6 common rafters in their designated positions along the 2 longest walls and nail them firmly to the wall with a nail gun. If the wall plates are all square of equal lengths then the hipped rafters would form a pyramid shape like the picture above normally a roof is rectangle and there are more yellow common rafters.

With a square roof the ridge becomes a square center piece kingpost with side lengths equal to common rafter thickness. 12ft 2 sq x 1 d 4x8 10ft 2x8 24 o c. The rafters carry the applied loads to the exterior walls. It s because all the sides of the roof will slope downward to your house walls.

Details for conventional wood frame construction. Joists and collar ties. Next soffit framing is installed along the roofs edge. Now outline the biggest rectangle inside the building layout.

And the line length measurement from the roof peak to the building wall is the hypotenuse. All wood to be 2 douglas fir or better. There are also no gables plus the slope of it is normally relatively gentle and also gives a lower appearance. Rafters act more like the top chord of a roof truss than as a roof joist.

The run or half the building span is the base of the triangle. Hip backing angle 15 4. Hip rafters are the diagonal rafters that span from the ridge at the top down to the corners of the roof. The function of each component is.

The first step in the process of erecting the hip roof is to get the ridge beam into place at the top of the roof. 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 framing of a basic gable roof is based on a right angle triangle and the various roof framing components fit the triangle. Not shown are the hip and valley rafters needed to tie the roof together where the rafters are framed at an angle to each other.

All construction shall comply with international residential code 2. In a rafter roof all of these components are required to provide a stable roof. Outside top plate edge to ridge top edge common 10 11 3 4. Attach 4 6 centering rafters and lift the ridge beam into place.

First of all you need to design the layout of building. Now draw the centerlines for all rectangles that are formed inside. The first approach to achieving a strong durable struc. Here roofs are constructed with an angle of 90 degrees.

Hip roof framing center join diagram with options for square roof 1.