I have recently had our balcony refinished to these standards...Polymer Membrane to be laid on to 350gsm separation fleece and mechanically fixed into T&G roof deck using SP40 steel pressure plates and RS fasteners. I mention this as I now want to finish the ceiling in the room on the underside of the roof where the joists and T&G are visible.
I have done some reading up on existing posts and see that before I board the ceiling I need to consider insulation, the ideal for me would be to use some 120mm kingspan non-foil backed sheets that I have left over from a previous project, cut up and fitted between the joists...the joists are 150mm.
My quandry is would 30mm airgap be enough and if it is ok, where should the airgap be, under or over the kingspan.
Thanks in advance.
I have done some reading up on existing posts and see that before I board the ceiling I need to consider insulation, the ideal for me would be to use some 120mm kingspan non-foil backed sheets that I have left over from a previous project, cut up and fitted between the joists...the joists are 150mm.
My quandry is would 30mm airgap be enough and if it is ok, where should the airgap be, under or over the kingspan.
Thanks in advance.
