Deflection was the governing limitation in all 2 12.
Roof truss span tables canada.
Visit the roof framing page for more information on cutting roof rafters and visit the roof pitch calculator for determining rafter lengths based on rise and run.
Roof framing suggestions canadian guidelines.
The maximum spans in the tables are shown up to 40 ft which is assumed to be the practical maximum span for residential roof trusses.
The same thing is true for the bridge of the truss.
Rafter spans can be extended slightly beyond what the rafter tables suggest when there is a cantelever extending beyond the supporting wall.
Sharon schlottmann october 14 2017 uncategorized leave a comment 57 views.
I am thinking of an exterior porch roof for 40lb ft snow load and a 12 span.
Ceiling joist span use this table to determine the maximum lengths of ceiling joists based on species of lumber joist spacing and joist size.
Want to know appropriate header size options using dimensional lumber.
The span capability of light frame trusses is dependent on loads style spacing depth lumber and plate properties.
I was just wondering if someone has a link for a clearly described span table for canada.
Rafter span tables use these tables to determine lengths sizes and spacing of rafters based on a variety of factors such as species load grade spacing and pitch.
Sample canadian spans for parallel chord floor trusses spaced at 400 mm sample spans m depth mm 1 9 kpa residential floor truss 2 4 kpa office floor truss.
The more complex the truss framework is the greater quantity of these joints will be required.
These steel joints are needed to support the overall truss.
Finally the truss calculator will compute the best dimensional method to connect the pieces of the truss with steel joints and a bridge.
Roof truss span tables alpine engineered products 15 top chord 2x4 2x6 2x6 2x4 2x6 2x6 2x4 2x6 2x6 2x4 2x6 2x6 bottom chord 2x4 2x4 2x6 2x4 2x4 2x6 2x4 2x4 2x6 2x4 2x4 2x6 2 12 24 24 33 27 27 37 31 31 43 33 33 46 2 5 12 29 29 39 33 33 45 37 38 52 39 40 55 3 12 34 34 46 37 39 53 40 44 60 43 46 64 3 5 12 39 39 53 41 44 61 44 50 65 47 52 70.
You can use sbca s span charts to roughly determine truss sizes available.
My guess is 3 2x10 sitting on top of a 6x6 pt post on each end but wanted to confirm.
This article excerpts from provides copies of roof framing suggestions from canadian building codes and the cmhc wood frame house construction guide.
Roof truss span tables canada.
Included are a series of representative roof truss span tables that will give you an idea of the truss spans available for a particular load condition load duration lumber type and truss configuration.
Keep in mind that these tables are for estimations only.
