Both external and internal walls of a building (‘hybrid insulation’ - not including insulation of demountable-clad buildings): BBA, Blue Flame Certification, CERTASS, Certsure, NAPIT, Stroma
Waliau allanol a mewnol adeilad (‘inswleiddio hybrid’ – heb gynnwys inswleiddio adeiladau â chladin dros dro): BBA, Tystysgrif Blue Flame, CERTASS, Certsure, NAPIT, Stroma