above, amendments to Appendix A (Performance of materials, products and structures) of Approved Document B (Fire safety) Volume 1 and 2 will come into force on 31 December 2020.
uchod, daw diwygiadau i Atodiad A (Perfformiad deunyddiau, cynhyrchion a strwythurau) i Ddogfen Gymeradwy B (Diogelwch tân) Cyfrol 1 a 2 i rym ar 31 Rhagfyr 2020.