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Calculation method for
assessing Thermal
Bridging at the edges of
openings
Example
The adjacent diagram shows a
window jamb in a masonry cavity
wall, with Therma-Bridge Plus
closing the cavity.
Robust details require a cavity
closer with a minimum Thermal
Resistance path of 0.45m:²K/W.
Calculaion of Thermal Resistance Path
(‘R’ value)
This table shows the thermal resistance for each segment of the path ABCDE. The
thermal resistance for each segment is obtained by dividing the length of the
path
segment in metres by its thermal conductivity in W/mK
Path Segments |
Length (m) |
Conductivity
(W/mK) |
Resistance
(m:²K/W) |
A-B |
0.0275 |
0.12 |
0.23 |
B-C |
0.015 |
1.13 |
0.013 |
C-D |
0.018 |
0.038 |
0.474 |
D-E |
0.04 |
0.770 |
0.052 |
Thermal Resistance Path (‘R’ value)
= 0.769m:²K/W |
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