It will if boards are fixed directly onto the joists and squash the top layer of insulation. Compressing modern 270 mm insulation down towards joist level can more than halve its performance and increase condensation risk. Raised loft boarding systems avoid this by lifting the deck above the full insulation depth so the material stays fluffy and effective.
About Us
Specialising in loft and wall insulation plus spray foam remediation, Insulation Group UK serves South England, the Midlands and the North. With SuperFOIL, Knauf and complementary services, it tackles cold homes, damp and lender concerns through professional surveys, breathable solutions and thorough aftercare support.
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Suite 135, 20 Winchcombe Street
Cheltenham, Gloucester GL52 2LY