Roof Energey Heel

The extra height of a raised heel truss roof provides additional space for uncompressed attic insulation and the full depth of insulation to be extended right to the outside of the top plate.

Roof energey heel.

Standard heel typical truss heel height is about 4. A more comfortable interior. This is created by designing the truss with a. An energy heel has a taller heel height which allows for the adequate amount of insulation to reach the outside wall and eliminate the cold spot.

1 tpi 1 2014 2 2015 irc section r202. Because raised heel trusses are high enough to leave the insulation value intact the energy code allows for use of less insulation for the entire ceiling system when raised heel trusses are used. Standard heel typical truss heel height is about 4. Design a raised heel.

More importantly the raised heel provides the opportunity to increase energy efficiency to meet new energy code requirements. Truss heel height the vertical depth of the truss at the outside face of the bearing. Truss heel height the vertical depth of the truss at the outside face of the bearing. To create an energy heel in the build roof dialog check trusses no birdsmouth uncheck automatic birdsmouth cut specify the desired energy heel height as a positive raise off plate value automatically generate or manually draw the roof planes then draw and position the first truss.

Raised heel trusses do not compress the attic insulation over the top plate which compromises the insulation value. Related videos roof framing. There are a couple of options for designing energy heels. Energy savings based on an analysis of homes located in climate zones 2 8.

Combined with a properly designed attic ventilation system and some well placed air sealing a roof framed with raised heel aka high heel or energy trusses reduces the temperature and pressure differences between the conditioned living space below and the unconditioned attic area thereby reducing thermal transfer or heat loss. The option 1 figure to the right shows a raised energy heel. Raised energy heel typical truss heel height is about 12 but may be designed to most any height per the building designer specification. Average energy savings of a raised heel truss home compared to a home with standard roof trusses insulated in accordance with table r402 1 2 and section r402 2 1 of the 2015 iecc.