Thermal insulation is only necessary in rare cases where upstairs rooms happen to be located above cold spaces like garages or passageways. But Part E of the Building Regulations does require floors to be insulated for sound. e simplest method to deaden impact sound (e.g. noise from people walking upstairs) is by laying thick carpets and underlay. e spaces between the joists can also be packed with sound-absorbing mineral wool (up to 80 per cent depth). Alternatively, special acoustic ooring, such as pre-insulated chipboard panels, can be used to build a sound-deadening floating floor. Other methods include xing ‘resilient bars’ to the undersides of joists prior to plasterboarding; British Gypsum’s Gypframe RB1 Resilient Bars is one such product.
Where resistance to the passage of sound is a particular design factor, suspended concrete flooring is normally the best solution. ere are systems such as the beam and pot system from Litecast that can achieve exceptionally high performance with specially formulated ‘robust tray tiles’ between the concrete beams. Whatever your choice of flooring, it’s obviously best to avoid cutting holes in ceilings for recessed lighting; a better idea is to construct a false suspended ceiling underneath to run ducting and lighting.
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