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. The 5th edition amendment 1 can be used until 26 November 2026. From 27 November 2026, anyone using H1/AS1 to demonstrate compliance with the Building Code must use the 6th edition.