Hi, my first post so sorry to drag up this old chestnut....
Property built in 1902 with suspended timber floors and ornate coving in two reception rooms.
1. I would like to insulate under the floors and leave boards exposed. I have seen a number of threads but no definitive answer about the best way to achieve this.
If I use a solid insulation board battened between the joists - kingspan or similar - do I still need a vapour barrier or breathable membrane and if so, where do I stick it? Do the insulation boards need to be placed so that they are touching the underside of the floorboards when they are relaid or should there be a gap? Is there anything else I should also be doing to reduce draughts from the edges/walls
If I use a soft, loft insulation type product, what sort of barrier/membrane should I drape between the joists to support it and which bits go where?
I don't think there is much crawl space but I intend to lift the boards to install.
2. Does anyone know how I might insulate internally my solid brick walls? I have considered drylining with thermal backed plasterboard as we are having damp treated and plater is being hacked off anyway, but cannot find a product thin enough. The existing plaster is only approx 20mm deep and we cannot go any thicker because of the period coving. The damp course company intends to render with a sand/cement mix with waterproof stuff in it to protect from damp after the chemical DPC has been injected. Anyone got any better suggestions to improve thermal qualities. I will not render externally.[/list]
Property built in 1902 with suspended timber floors and ornate coving in two reception rooms.
1. I would like to insulate under the floors and leave boards exposed. I have seen a number of threads but no definitive answer about the best way to achieve this.
If I use a solid insulation board battened between the joists - kingspan or similar - do I still need a vapour barrier or breathable membrane and if so, where do I stick it? Do the insulation boards need to be placed so that they are touching the underside of the floorboards when they are relaid or should there be a gap? Is there anything else I should also be doing to reduce draughts from the edges/walls
If I use a soft, loft insulation type product, what sort of barrier/membrane should I drape between the joists to support it and which bits go where?
I don't think there is much crawl space but I intend to lift the boards to install.
2. Does anyone know how I might insulate internally my solid brick walls? I have considered drylining with thermal backed plasterboard as we are having damp treated and plater is being hacked off anyway, but cannot find a product thin enough. The existing plaster is only approx 20mm deep and we cannot go any thicker because of the period coving. The damp course company intends to render with a sand/cement mix with waterproof stuff in it to protect from damp after the chemical DPC has been injected. Anyone got any better suggestions to improve thermal qualities. I will not render externally.[/list]
