Loft insulation into sloping ceiling

23 Aug 2005
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United Kingdom
I live in a converted Victorian primary school where the original schoolroom is the main living room. At some time the ceiling has been re-done with plasterboard over the original lath and plaster (probably by the County Council when the chimneys were blown down in Michael Fish's non-hurricane).

None of the loft space is insulated and I'm fairly keen to sort this out as the roof area is huge, around 42 feet long by 18 feet wide, and the heat loss is likely to be considerable. This is not as big a financial problem as it may be otherwise as this particular space is heated by a woodburner with back boiler and my wood supply is free, but I'd obviously like to improve energy efficiency. Access to the loft space is possible via several hatches originally used for ventilation, although not easy, but the real problem is the sloping portions of the roof that make up 50% of its area. There's about 100mm depth between the lath and plaster and the roofing felt, but the original lath and plaster surface is as rough as can be. Has anyone ever tried to insulate such a structure using something like Cellotex? If so, what problems were hit or can you give any advice? Any alternative products that could be used?

Hope someone can help as this is too big a job to set off on without exploring every option!

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