At least half of the structure of multi-storey buildings should be non-combustible to make them easier to insure, according to a new report on the risks of mass timber construction.

RISCAuthority, which has carried out research into the risks of mass timber structures on behalf of 24 insurers including Aviva, Axa and Zurich, said buildings include all concrete cores and structure up to first floor level and concrete floors that alternate with structural timber above that.

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