Approved Document B (Fire safety) Volume 2 Buildings other than dwellinghouses (2006 edition incorporating 2010, 2013 and 2016 amendments)
Dogfen Gymeradwy B (Diogelwch tân) Cyfrol 2 Adeiladau ac eithrio tai annedd (argraffiad 2006 sy'n ymgorffori diwygiadau 2010, 2013 a 2016)