On Jun 12, 10:24 am, wrote:
On 12 Jun, 10:11, Maris wrote:

On Tue, 12 Jun 2007 00:37:50 -0700, wrote:
i'm putting 2 layers of plasterbaord onto a false ceiling. one layer
of plasterboard is foil faced for a vapour check. should i put the
foil faced boards on top (ie foil face next to insulation) or the foil
faced boards as the bottom layer (ie foil face sandwiched between two
layes of plasterboard) ... does it matter.

thanks

Why are you putting up 2 layers of plasterboard and why are you using
foli-backed plasterboard?

2 layers for improved sound insulation and as a fire check between
properties of differing occupancies. vapour check for moisture /
condensation control (this isn't unusual) its a cofeeshop, our sitting
room is directly above. the ceiling has been lowered with a timber
stud frame with rockwool flexi between the studs (more sound
insulation + thermal insulation)

Is the stud frame decoupled from the joists above? For best sound
insulation it should be a free floating frame supported only at the
walls). Make sure the edges (board/wall), and the places where
lighting cables come through, are well 'caulked' so the are no
acoustic paths through.

I (for one) would be interested to hear how well you find the sound
insulation works.

Robert