Construction and exterior plywoods are bonded with A Bond exterior glues which are suitable for exterior use, H3.2 Radiata construction ply in CD or DD comes as a ASNZ2269 certified structural panel. CD has one sanded face, while D face allows for some unfilled knots & splits. Untreated Radiata used for interior purposes. B/D Untreated Non structural Radiata pine Plywood. Plyflor Tongue & Groove 15mm & 18mm Untreated.