Flat Roof Trusses Section On Block

Just as there are many types of roofs with many roof parts there are many different types of roof trusses this extensive article explains through a series of custom truss diagrams the different truss configurations you can use for various roofs.

Flat roof trusses section on block.

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. For seismic design categories a b and c where the distance from the top of the braced wall panel to the top of the rafters or roof trusses above is 91 4. Roof truss span chart. Spaced sheathing or 1x boards may be reduced slightly.

Spans for 2x4 top chord trusses using sheathing other than plywood e g. If you want to build a flat roof then you will need to build a flat roof truss these are designed to span the space between two load bearing walls and take the weight from the roof onto these walls. And ceiling joists in accordance with section r802 8 and for trusses in accordance with section r802 10 3. The run or the base number is 12 inches.

Roof ventilation shall be provided in accordance with section r806 1. Modern architecture has traditionally been characterized by flat roofs flat roofs create long horizontal planes reminiscent of the broad horizon line seen often in nature. Pitch slope the pitch or slope is the incline of the roof expressed as a fraction describing the rise over the run. The rise will be the elevation change over the 12 inches.

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. While this article focuses on configurations we also have a very cool set of illustrations showcasing the different parts anatomy of roof trusses.