Joists and collar ties.
Porch hip roof framing details.
When building a porch roof with trusses on this type porch the corner and subsequent trusses are built a little differently due to the slope of the roof.
Attach 4 6 centering rafters and lift the ridge beam into place.
All construction shall comply with international residential code 2.
It s because all the sides of the roof will slope downward to your house walls.
Now draw the centerlines for all rectangles that are formed inside.
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.
Rafters act more like the top chord of a roof truss than as a roof joist.
Hip and valley roof framing is no so complex as compared to hip roof framing procedures.
Outside top plate edge to ridge top edge common 10 11 3 4.
With a square roof the ridge becomes a square center piece kingpost with side lengths equal to common rafter thickness.
Next soffit framing is installed along the roofs edge.
Details for conventional wood frame construction.
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.
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.
In a rafter roof all of these components are required to provide a stable roof.
And the line length measurement from the roof peak to the building wall is the hypotenuse.
First of all you need to design the layout of building.
The function of each component is.
The run or half the building span is the base of the triangle.
All wood to be 2 douglas fir or better.
The framing of a basic gable roof is based on a right angle triangle and the various roof framing components fit the triangle.
American forest paper association wood construction data 1.
There are also no gables plus the slope of it is normally relatively gentle and also gives a lower appearance.
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.
The first approach to achieving a strong durable struc.
12ft 2 sq x 1 d 4x8 10ft 2x8 24 o c.
Hip backing angle 15 4.
As you can see the truss angles are constructed to maintain the same slope.
Hip rafters are the diagonal rafters that span from the ridge at the top down to the corners of the roof.
The rise or height of the roof at its peak is the altitude of the triangle.
Hip porch roof framing this style that can be used for framing your porch is a little complex or more difficult to make.
Now outline the biggest rectangle inside the building layout.
Here roofs are constructed with an angle of 90 degrees.