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Edge Compression R-value Calculator
Comfortech® has worked with Design Navigator to develop an Edge Compression R-Value Calculator. This calculator allows us to extrapolate the product R-value across the last 500mm of the ceiling or roof perimeter, under compression to ensure you will meet the required R3.3 construction R-value under the 5th Edition of H1.
Single layer solution with insulation guard
Double layer solution with insulation guard
Note: The calculation assumes that the bottom of the insulation is flush with the top of the top plate across the whole width. In reality there may be a gap between the top of the lining and the top of the top plate. Therefore, the insulation will be less compressed as calculated in this spreadsheet. That calculation is therefore conservative.
Results:
Not Compliant
Perimeter Insulation Only Average R-Value
Increase heel height to reduce compression
The compression is over too large an area; increase heel height to reduce compression area
Roof Slope
Degree
Perimeter width
mm
Total Height at Heel
mm
% max compression
Minimum R value
Truss chord height
mm
Raised Heel Height
mm
Include Roll Panel Vent
Uncompressed insulation thickness
mm
Uncompressed insulation R value
% R-value Reduction per % compression
Roof Slope
Degree
Perimeter width
mm
Total Height at Heel
mm
% max compression
Minimum R value
Truss chord height
mm
Raised Heel Height
mm
Include Roll Panel Vent
Uncompressed insulation thickness
mm
Uncompressed insulation R value
% R-value Reduction per % compression