Clearance for walkways above insulation
50 mm
Boarded walkways and working platforms within roof spaces must be securely fixed and maintain a minimum 50mm clearance above the insulation
Boarded walkways and working platforms within roof spaces must be securely fixed and maintain a minimum 50mm clearance above the insulation. This gap is essential to ensure adequate ventilation of the roof space and to prevent compression of the insulation.
Basis in regulation
How to check it on site
Check that all walkways in the roof space are securely fixed and maintain the specified clearance above the insulation.
Common failure
Walkways installed directly onto or too close to insulation, leading to compression and reduced thermal performance.
Last updated 23 August 2026. This is our editorial summary of publicly available regulation, not building control approval or a warranty determination.