BU677 Specifying roofs under H1 (2022)
Product Description
This bulletin guides architects and designers in specifying thermal roof performance that complies with H1/AS1 and H1/VM1 5th edition amendment 1.
Wishing you a safe festive season. We are closed from midday 24 December 2025 - 5 January 2026.
This bulletin guides architects and designers in specifying thermal roof performance that complies with H1/AS1 and H1/VM1 5th edition amendment 1.