Let s consider a basic gable wood roof framing design.
Framin roof layout 2 foot on center.
A 2 x 4 should be 1 1 2 inch thick but often the actual thickness may be 1 3 8 or 1 9 16 inches.
The run or half the building span is the base of the triangle.
If you use on center spacing it doesn t matter if the material thickness varies a bit.
Floor beam span tables of residential structural design we will now look at roof rafter and beam design.
Studs wall framing members are placed on either 16 inch or 24 inch centers.
This will the first point of the rafter measurement line using the results of your rafter length calculation measure from this point along the rafter measurement.
Industry standard increments typically either 12 16 or 24 inches apart.
From one end of the rafter material using a speed square or framing square mark an x in 12 angle on the rafter and cut it measure down y height from the long point of the rafter cut and make a mark.
How to layout your framing to 16 on center.
Again we ll use a stud wall as an example here but this can be applied to anything else such as floor joists.
Because your layout is based on the center of the material these minor differences are split equally to both sides.
Now that you have an idea about the materials you ll need as well as any mistakes you ll need to be wary of making it s time to get to work on the wall layout.
Now that the background is out of the way let s look at how you actually go about applying this information in your framing.
These spacing intervals are measured on center meaning that the.
Rafter and roof joist spacing is only one part of a complex roof design that works together to form a structure that meets building codes and can hold up the weight of the roof and roof load.
How to order trusses.
The exception according to the 2015 irc is 2 6 walls supporting two full floors plus a roof assembly above or 2 4 walls supporting one floor plus a roof assembly above zip sheathing can typically be installed either vertically or horizontally.
The rise or height of the roof at its peak is the altitude of the triangle.
This technique will reduce material use labor and waste as many products come in multiples of 2 feet.
Structurally in most cases exterior wall framing can easily be 24 in.
The pros of using roof trusses drastically outweigh the pros of stick framing.
Here we have a wood framed gable roof.
For example with proper planning the entire cutoff from a center.
Sure there may be an instance where stick framing is your only option and that is understandable.
Continuing on from part 3.
Pricing roof trusses.
The image below shows a cross section of our simple 12 x 13 house from the joist span tables section of this tutorial.
The pros of using roof trusses instead of stick framing.
This means from the exact center of one stud to the exact center of the adjacent stud is 16 or 24 inches.
Roof framing rafter layout.
And the line length measurement from the roof peak to the building wall is the hypotenuse.
