Loft insulation advise

Joined
27 May 2004
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Location
Herefordshire
Country
United Kingdom
We currently have 100mm of glass fibre insulation between the joists in our loft. Approx 1/2 the loft has 18mm chipboard floor over this insulation. There is 12.5mm silver backed plasterboard on the ceiling below. Joists are only 100mm deep and we have W-Fink truss's so WON'T be planning a loft conversion.

I want to put some more flooring down to tidy up the loft space, what could I put under the floorboards instead of the old glassfibre insulation to give me a better U value?

I am not going to be storing particularly heavy items so I don't want to install new rafters at 90 degrees to give more insulation space.
 
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