Accounting for a thermal break for steel stud frame construction.

Insulbreak 65 and most thermal break wrap products have an R-Value of R0.2.  If the thermal break is applied as a thermal break and full weatherproofing wrap, R0.2 can be added to the bulk insulation to show the additional R value within the final calculation. 

Insulbreak is a foil sided bubble wrap, anti-glare one side product.  If installed within a stud frame system without an air gap the anti-glare side of the product will not improve the system value of the wall.  All anti-glare of reflective products must be adjacent to approx. 20mm / 25mm air gap to improve the system value of the wall.

If the thermal break product is only being used in strips and applied to steel stud frame members, the R0.2 must not be added - as examples below.

Example 1 : a thermal break installed as a weatherproofing wrap applied to a 90mm steel stud wall insulated with R2.0 and no air gap = Rt 2.28

E1.png

Example 2 : a thermal break installed as a weatherproofing wrap applied to a 90mm steel stud wall insulated with R2.0 with a 25mm air gap = Rt 2.56 (improved by R0.28 based on an anti-glare air gap)

E2.png

Example 3 : a thermal break installed in strips applied to the steel stud frame members, with a standard weatherproofing membrane insulated with R2.0 and no air gap = Rt 2.08

E3.png

Example 4 : a thermal break installed in strips applied to the steel stud frame members, with a standard weatherproofing membrane insulated with R2.0 and a 25mm air gap = Rt2.36 (improved by R0.28 based on an anti-glare air gap)

E4.png

 

Please Note: the above values do not show or include internal and external air films and results would improve by specifying a reflective product.  

Typical Emittance for Anti-glare Face : E0.05

Typical Emittance for Reflective Face : E0.03

 

 

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