Can any kind soul give me chapter and verse on what, for BC Regs, constitutes a 'habitable room'?
Over a decade ago I had built - with PP and BC - a single-storey extension to a two-storey, non-Listed Edwardian house and brought the existing upper pent roof down to cover the extension. This created a triangular void about 30' x 10' x 6' ( headroom in the triangular apex ) which was accessible by clambering through what had been an upper-storey, landing window. There was no insulation in way of the 100mm x 50mm roof timbers. 4 Velux roof windows, and a single ventilator-tile, penetrate the pent roof over this void-space.
I now want to use the space for bulk light storage in plastic boxes ( duvets, spare bedding ) and have removed the 'internal' window and brickwork below, to landing floor level, leaving an opening about 1.7m x 1.3m which will have double-fold walk-through double-glazed doors.
I'm planning the insulation, am looking to use 50mm polystyrene sheet between the rafters ( with a 50mm ventilation gap ) and 75mm Celotex sheet below. I understand that may give me a U-value of 2.0 or better, and so satisfy the current Part L Regs. Should I need more, then I'm considering a multiple foil blanket - not drylining.
I tried asking my LABC for guidance on what they'd be looking to see, and got a very patronising response from a youngster who looked like he wouldn't know which end of a hammer or trowel to hold. I'm sure there's more knowledge here about what's 'habitable' and what's not....
Over a decade ago I had built - with PP and BC - a single-storey extension to a two-storey, non-Listed Edwardian house and brought the existing upper pent roof down to cover the extension. This created a triangular void about 30' x 10' x 6' ( headroom in the triangular apex ) which was accessible by clambering through what had been an upper-storey, landing window. There was no insulation in way of the 100mm x 50mm roof timbers. 4 Velux roof windows, and a single ventilator-tile, penetrate the pent roof over this void-space.
I now want to use the space for bulk light storage in plastic boxes ( duvets, spare bedding ) and have removed the 'internal' window and brickwork below, to landing floor level, leaving an opening about 1.7m x 1.3m which will have double-fold walk-through double-glazed doors.
I'm planning the insulation, am looking to use 50mm polystyrene sheet between the rafters ( with a 50mm ventilation gap ) and 75mm Celotex sheet below. I understand that may give me a U-value of 2.0 or better, and so satisfy the current Part L Regs. Should I need more, then I'm considering a multiple foil blanket - not drylining.
I tried asking my LABC for guidance on what they'd be looking to see, and got a very patronising response from a youngster who looked like he wouldn't know which end of a hammer or trowel to hold. I'm sure there's more knowledge here about what's 'habitable' and what's not....
