External walls of a building (not including insulation of demountable-clad buildings): BBA, Blue Flame Certification, CERTASS, Certsure, NAPIT, Stroma
Waliau allanol adeilad (heb gynnwys insiwleiddio adeiladau â chladin dros dro): BBA, Tystysgrif Blue Flame, CERTASS, Certsure, NAPIT, Stroma