How To Figure Roof Trusses

This is a way of measuring the degree of steepness of the roof.

How to figure roof trusses.

See the image below for more explanation on rise run and pitch. Our roof rafter calculator tools are handy for calculating the number of rafters needed rafter length calculator lineal feet of rafter board feed in ridge and sub facia and the total board feet in the roof. Rise and run means that a 6 12 pitch roof has 6 of rise vertical for each foot of run horizontal. The alternative is to build up the roof s frame with 2x8s and 2x10s.

We can figure the rough cost of a truss by the lineal feet of truss which in this case is 26 feet. A roof s pitch is determined by how much it rises vertically for every foot it runs horizontally. The cost of lumber averages around 3 75 to 4 25 a foot. Thus a moderate 6 in 12 roof pitch means that the roof rises 6 inches vertically for every 12 horizontal inches it runs.

The important point to keep in mind when you use your truss calculator is that every truss calculation is completely unique and is based on the size of your roof and its specific dimensions. The truss is a framework consisting of rafters posts and struts which supports your roof. Steeper roof pitches require longer webs which add to the cost. Roof trusses are prefabricated triangulated wooden structures used to support the roof.

Slope the slope of a roof is represented as x 12 where x is the number of inches in rise for every 12 inches of run this is very useful information for many purposes especially for roof framing the slope sometimes called pitch is calibrated on speed squares. Angle the angle of a roof is the same as the roof s slope except instead of being. Trusses are required by all building codes to be engineered by a structural engineer and have an engineer s stamp on the truss s drawings. A 12 in 12 pitch is a steep 45 degree angle roof.

Premade size 4 12 24 ft 50 ft or type scissor attic hip mono and more. Explore labor costs to set install replace or repair for gambrel. The pitch of the roof is a ratio. The number of inches that the roof rises vertically for every foot of roof.

Roof pitch calculator results explained. Homeadvisor s roof truss cost calculator gives average prices for trusses by material steel vs. So use a tape measure to find the height of the roof above the top wall of the building.