Roof Trusses...Engineered to make the process simple

The best practice for energy-efficient roof framing is the use of raised heel roof trusses; these offer both structural stability and room for more insulation, which helps to increase a home's energy efficiency. I typically spec at least a 7” heel on every roof system I design.

A raised heel truss adds an extension to the top of the exterior wall, allowing for the full depth of insulation to be applied it will also increase the clearance between top of window and bottom of soffit system. Installation of this style of roof truss isn't any more difficult than traditional pre-built trusses.

Here's how to do it:

• Keep the truss in an upright position to avoid lateral flexing, which could potentially damage the structural integrity of the truss.

• With the peak of the truss pointing downward, place the heels of the gabled end truss on top of the side walls.

• Rotate the truss to its upright position using two "Y" shaped lifting poles.

• Check the overhang and toenail the bottom chord to the end wall top plate with 16D nails.

• Brace the gabled end truss to the ground.

• Raise and toenail common trusses in sequence until you're finished.

• Be sure to laterally brace the trusses at the top chord with 2"x4"s at 8' intervals.

• Diagonally brace the trusses with a descending 45-degree board from top to bottom chord.

• Simpson offers a great accessory in the TSF-224 fold out permanent truss spacer giving you perfect 24” O.C. spacing.

• Remove the temporary bracing as you install the roof sheathing.

Common Truss Types by Name

If you would like to learn more follow the link below to the Structural Building Components Association site.