Roof type chart 1.
Traditional roof framing.
The best roof shape for a high wind area would be a hip roof but it s more expensive to construct than a traditional gable roof a common roof for sheds.
The traditional roof framing geometry used by the french and germans carpenters of the past represents the timber in three dimensional visualizations stereotomy.
Position the square at the end of the rafter board with the tongue on your left and facing away from you.
Locate a centerline at the middle section.
However you should be very careful while doing this as one wrong cut can compromise the strength of the truss.
Measure form the top of this line down the board to determine the line length or length of the rafter less the ridge.
Add the length of the overhang beyond this mark and.
The bonnet roof is identified with the extending ledge around the base of the roof.
Weather you re building a shed roof or adding a dormer to your second story it is important to choose the proper size rafter.
Depending on the roof design and the roof rafter spacing.
Figure 2 2 roof framing terms.
Line length is the hyptenuse of the triangle whose.
The other part of the.
With this type of roof truss it is possible to add as many webs as you want to the centre of the truss.
The butterfly roof is an.
Draw a ridge line between the intersection points of the hip rafters.
This sizing guide for roof rafters will help determine what you need for your small project.
Start with a layout of a rectangular shape building.
It s steep pointed roof which extends all the way to the ground.
In terms of roof covering standing seam metal roof would be the best option in terms of strength and durability but you could also go with architectural shingles light color roof.
Now draw a 45 degree line from each corner toward the centerline that can help to establish location specifications for.
Joints on a traditional roof truss frame are mostly held together by metal plates or solid wood pegs.
Rafters are the traditional method for supporting a roof.
The a frame is very easy to identify.
This allows the carpenter to layout complex cuts from 2 dimensional plans that represent the true shape of the rafter or timber framing joint.
There are several variables to consider when determining the proper rafter size.
Building codes such as the icc s 2012 international building code section 2308 10 roof and ceiling framing typically specify that where rafter ties are used they are required at intervals ranging from 12 to 24 o c.
If the unit of rise in inches is 3 then the cut is the unit of rise and the unit of run 12 inches or 3 12.
