Has anyone had their interior walls insulated with insulating plasterboard? I'd like to know if it is effective, how much of the room space you "lose" (i.s. how thick does it have to be) and whether it's an expensive option. I'm sick of my freezing cold back bedroom!
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We did our back bedroom wall with insulated plasterboard [25mm insulation] and replaced the ceiling with platerboard with 50mm urethane foam plus 50mm polystyrene between the joists. Both made a difference but the ceiling made the major difference.
If it is a bedroom, and you can access the loft space above, first check if you have the full, recommended depth of loft insulation (270mm). A lot of heat will be going straight up through the roof of the bedroom. Once you have done that, you can think about insulating below the ceiling (as WightmanPaul says below). If you want to put internal insulation on the walls (the biggest effect of this will be on external walls, or party walls), the best stuff is Celotex (which you gan get at Wickes), which comes in thicknesses of 25-100mm (1-4 inches). You can make a decision about how much of the width of the room you can lose, balanced against the reduction in heat loss. Celotex is a bit more expensive than foam plastic or fibreglass insulation slabs, but has greater insulation potential for the same depth. You can fit it between wooden battens attached to the wall, say 50mm battens, for 50mm thick Celotex. You could also reduce heat loss through the windows by using secondary double glazing, basically fitting sheets of transparent vinyl, which you can get from Homebase, B&Q, Wickes, and fit using Velcro tape. Also, fitting good quality, thermally lined curtains to the windows will help.
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