Thermal Bridging
occurs when the insulation value of a wall, window, roof, or slab is interrupted by a linear element such as a window sill, a point thermal bridge such as a screw that penetrates the insulation, or a geometric condition such as a corner
Passive House architects take care to minimize thermal bridges in order to avoid cold spots that could promote mold and to reduce heat loss through the building enclosure.
![Image](/images/2022/03/14/thermal-bridge.png)
Building enclosure heat loss (and summer heat gain)
calculate by summing:
the area x U value of each component of the building envelope (i) +
the length and psi value of each linear thermal bridge (k) +
the chi value of each point thermal bridge (j)
![Image](/images/2022/03/13/heatloss.png)
Calculations
if a catalog value for a thermal bridge isn't available, you can use software such as THERM or Flixo
Consultation
request a thermal bridging consultation