Thermal Bridging

Do thermal bridges have to be calculated, if they are deemed by a certification body to be thermal bridge-free?

No

Which of the following can be used to reduce the thermal bridge, at the floor of the wall junction?

Aerated block

Which of these Psi values is the most energy efficient?

Psi = -0.030

What is considered to be thermal bridge free in Passive House??

Psi value ≤ 0.006 Btu/hr.ft.F

What is the typical ‘r per inch’ of aerated concrete?

r = 0.72 hr.ft2.F/Btu.in

In a material penetration in a Passive House, what ‘r per inch’ value should be avoided?

r = 0.13 hr.ft2.F/Btu.in

Which is typically the longest thermal bridge in a Passive House?

Window to Wall Connection

In a hot climate, what effect would thermal bridges have in the summer?

Increase in cooling load and cooling demand

What is the typical ‘r per inch’ of XPS?

r = 5.72 hr.ft2.F/Btu.in

The best way to reduce thermal bridges on a retrofit is…

external insulation.

Which of the following creates the worst thermal bridge in wood frame construction?

2×6 framing

Where is easier to find a negative thermal bridge in a Passive House?

External Wall to Roof Junction

What does a thermal bridge free design guarantee?

No mold or condensation

Internal warm surfaces

Comfort