ABSTRACT
The Building Regulations which refer to the alteration of houses into flats and the conversions of lofts into habitable rooms are: https://www.niso.org/standards/z39-96/ns/oasis-exchange/table"> B1 Means of escape B3 Internal fire spread (structure) B4 External fire spread E1 Airborne sound (walls) E2 Airborne sound (floors) E3 Impact sound (floors and stairs) F2 Condensation K1 Stairs and ramps
