CLT specialist Waugh Thistleton has vowed to keep lobbying the government after it banned the use of engineered timber in buildings taller than 18m.

The Stirling Prize-shortlisted architect said ministers’ decision to outlaw the sustainable material’s use was disappointing.

It accused the government of “overreaching its stated aim” and misunderstanding the fire performance of engineered timber.

On Thursday the government laid an amendment to Approved Document B which ruled out the use of any material within an external wall that does not have one of the top combustibility ratings, A2-s1, d0 or Class A1, with the exception of membranes, seals and gaskets.

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