Thermal Bridge Free Design

To analyze the thermal performance of our enclosure system we investigated different detail solutions in terms of their linear loss coefficients due to thermal bridging effects.

Thermal bridges can account for more than 10% of the total losses for a typical façade segment. While these analyses were performed using THERM 7.3., REMrate in comparison, which was used for our energy analysis does not directly account for thermal bridges in such detail, although these bridges will have an impact on energy performance.

The actual total heat losses can been considerably reduced with correct details. Exemplary for our thermal bridges analysis, we discuss our window installation detail. Our design moved the window installation pane from the exterior close to the center axis of the enclosure system. The OSB provides a sufficient mounting basis, and allows for reaching 2” over the edge of the raw opening formed by the surrounding studs and headers. This additional space can now be filled with solid insulation while the remaining gap will be filled with spray foam. This option allows for a thermal bridge free construction, bringing the linear thermal loss coefficient around the perimeter of the window close to zero.