Sizes of ceiling battens, linings and non-trafficable decking, binders, ceiling joists, hanging, counter, combined and strutting beams, underpurlins, rafters and purlins, ridge and intermediate beams, roof battens and cantilevered gable ends come from the Supplement tables and the clause rules for the member.
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.