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We removed the old thin stuff but if you've got the space I imagine you could keep it. We did a layer between the joists then a layer perpendicular across the tops of them, hence needing to raise the floor level. Important to look at any wires up there and keep them on top of the insulation if you can and if you put a floor over it keep a bit of an air gap
Sumo-
I'm keeping the existing installation that doesn't looks too bad and building up 300mm on top of that. My place has metal conduit for all the wiring in the loft so I sort of have to go on top with the perpendicular layer, but hopefully it will be fine. #prayforandos
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All good info, thanks!
andos
ltc
On the topic of loft insulation. My loft has some existing insulation but it's old and pretty thin. Is it a case of just chopping some new insulation to size and chucking it on top of what's already up there between the beams?