Flat Roof Rafter Truss

A flat roof truss is also known simply as a flat truss and is not completely flat but rather slightly sloped in order to allow water to run off of the roof.

Flat roof rafter truss.

A pitch truss with a truncated or flat apex so that it can support more load. Roof trusses are engineered wood alternatives to hand framed rafters. Compare click to add item 26 spreadweb residential roof truss 5 12 pitch 87 to the compare list. This is our ultimate roof rafter guide for people designing and building an off grid cabin or tiny home.

Examples of live loads are snow wind rain and temporary construction loads. Live loads are not always present. Click to add item 26 spreadweb residential roof truss 5 12 pitch 87 to the compare list. They are designed at a 4 12 pitch to be spaced 2 foot on center.

Hip roofs are more stable than gable roofs and more resistant to strong winds and hurricane. The truss is a framework consisting of rafters posts and struts which supports your roof. They support live and dead loads by efficiently transferring the loads to the building walls or supports. The boards creating the slope of the roof are wider than lumber used to build trusses 2x8s 2x10s and 2x12s are most common in rafters vs.

Rafter boards are fastened to the ridge board at the peak and the top plate where they join the wall. In order to make this correctly you will have to work out exactly what you need to do with your truss in order to create a flat roof. Pre manufactured stock trusses are constructed with spruce pine fir spf or southern yellow pine syp lumber. Most economical when the difference in slope between the top and bottom chords is at least 3 12 or the bottom chord pitch is no more than half the top chord pitch.

These trusses the meet building code criteria as specified by structural building components of america sbca and the truss plate institute tpi. Learn the 1 rafter design that will guarantee your roof that is safe and strong for years to come. Flat the most economical flat truss for a roof is provided when the depth of the truss in inches is approximately equal to 7 of the span in inches.