Non-metallic building materials, namely semi-finished wood products particularly frames, beams, posts, roof shingles, joists, floor boards, planks, joint pegs and panels; non-metallic building materials, namely finished wood products particularly interior and exterior window frames, interior and exterior doors, door frames, window louvres, worktops, facings and sidings, external decking, roofing trusses, roof light frames, frames, beams, skirting, posts, roof shingles, joists, joint pegs, flo...