How To Figure Roof Trusses

Roof trusses are prefabricated triangulated wooden structures used to support the roof.

How to figure roof trusses.

A roof s pitch is determined by how much it rises vertically for every foot it runs horizontally. 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. 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. Steeper roof pitches require longer webs which add to the cost.

Premade size 4 12 24 ft 50 ft or type scissor attic hip mono and more. This is a way of measuring the degree of steepness of the roof. Homeadvisor s roof truss cost calculator gives average prices for trusses by material steel vs. Angle the angle of a roof is the same as the roof s slope except instead of being.

Roof pitch calculator results explained. We can figure the rough cost of a truss by the lineal feet of truss which in this case is 26 feet. Calculate the roof pitch. The alternative is to build up the roof s frame with 2x8s and 2x10s.

So the next question you ask is how much will this common truss cost. 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 same is true if we make it steeper.

Rise and run means that a 6 12 pitch roof has 6 of rise vertical for each foot of run horizontal. 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. A 12 in 12 pitch is a steep 45 degree angle roof. The truss is a framework consisting of rafters posts and struts which supports your roof.

The number of inches that the roof rises vertically for every foot of roof. 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. See the image below for more explanation on rise run and pitch.