Raised Heel Roof Truss Design

With this type of energy heel the wall sheathing will usually need to extend up the outside of the truss.

Raised heel roof truss design.

Spread web storage trusses are engineered to have a small area to allow storage within. This is created by designing the truss with a heel height tall enough to meet the r value requirements. It is raised higher with a heel that extends up from the top of the wall and elevates the truss at the building s edges. Truss heel height the vertical depth of the truss at the outside face of the bearing.

Though extra material is used to create the trusses raised design the extra cost can be offset by the need for less insulation without compromising energy efficiency. Published on may 9 2016 david hawkins prairie design build s building scientist discusses the roof trusses at the mission cliffs passive house and how the raised heel allows for more insulation. Raised heel trusses for efficient cost effective comfortable homes form r330 provides guidance on building with raised heel trusses for designs that meet these categories. Standard heel typical truss heel height is about 4.

The heel of a conventional plated roof truss where the bottom chord intersects with and bears on the perimeter wall plate and is fitted with a vertical member that literally raises the top chord of the truss. Post frame trusses can be used for agricultural residential commercial or industrial use. The option 1 figure to the right shows a raised energy heel. A raised heel truss is much like it sounds.

A raised heel truss is identical to a conventional truss except for one difference. Energy trusses have raised heels so they can reach r values of 30 or higher. The guide can be downloaded for free from the apa s website. Raised heel trusses differ from their conventional truss counterparts in that they are fitted with a heel where the bottom chord intersects with the perimeter wall plate which raises the top chord.

Post frame trusses are designed to be placed at spans greater than two feet on center. Also the raised heel trusses are assumed to have a heel height of between 9 inches to 15 inches. Raised heel trusses are engineered utilizing advanced design and manufacturing techniques to meet modern building codes.