Think of a flattened hip roof.
Roof framing plan weird angle.
Part of a framing plan for a hip roof is shown in figure 18 3.
On a hip roof framing plan the lines that indicate the hip rafters ec ac kg and ig in figure 18 3 form 45 angles with the edges of the building.
4 12 through 9 12 are the most common pitches.
Keep the framing square in the same position and use your pencil to trace the tongue short side along the surface of the rafter.
As you can see the initial plan for framing your roof needs to take into account several key variables such as the shape of the roof and any relevant community building codes.
3 inch rise per 12 run is a 3 12 pitch roof.
You will then have to choose between two very different types of roof framing stick framing vs.
A flat roof has a slope of 1 8 per foot to 2 12.
It is not ideal for snow or heavy rain but modern materials and proper drainage have helped.
Set aside at least a four day chunk of time for the basic framing because once the roof s open you ve got to keep at it until the dormer is weathertight.
Roof framing terms are related to the parts of a triangle.
Cover some of the more common roof and rafter terms you ll need.
If you build a flat roof try to have it slope in multiple directions to drains or gutters.
The stair gauges will hold the framing square at the proper angle this will mark the tail cut.
Conclusions on roof framing.
Framing a roof is the last step in framing new construction.
The polygon roof miter angle is the tangent of the polygon central angle divided by two.
The tangent of 22 5 41421 laying out an octagon using a framing square we would take 12 on the blade and the number to be taken on the tongue is 12 41421 which is 4 97.
Span is the horizontal distance between the outside.
With the saw bevel angle set to 45 cutting hips and creepers at the plumb cut angle will produce correct side angles.
One half of 45 is 22 5.
Vertical rise over horizontal run.
The very end of your rafter with the 6 inches 15 cm overhang built in and the birdsmouth cut neatly marked.
The central angle for an octagon roof is 45.
Then you can relax a little as you finish the exterior siding and trim.
While most home builders will outsource the construction of roofing trusses the rafter supports of the roof itself learning to frame a roof yourself is one of the true arts of carpentry and a basic primer is covered below.
If using a circular saw or compound miter saw set saw bevel angle to 45 to obtain creeper and hip side angles.
Roof pitch the roof pitch is the numerical measure of how steep or shallow a roof is.
Roof features associated with basic roof framing terms are shown in figure 2 2.
Hip roof framing rafter cut angle template diagram.
Refer to the figure as you study the terms discussed in the next paragraphs.
In the u s it is defined by the rise in inches to a 12 run.
