Approved Document B (Fire safety) Volume 2 Buildings other than dwellinghouses (2006 edition incorporating 2010, 2013, 2016, 2017 and 2020 amendments) Part B, Schedule 1 31 December 2020
Dogfen Gymeradwy B (Diogelwch tân) Cyfrol 2 Adeiladau ac eithrio tai annedd (argraffiad 2006 sy'n ymgorffori diwygiadau 2010, 2013, 2016, 2017 a 2020)