Rigid loft insulation under boarded floor

2wd

Joined
28 Nov 2018
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United Kingdom
Hi
A few years ago I had my loft boarded over mainly over the living room area ( it's a bungalow)
It's only used for storage and the builder who did just put the boarding directly on the joists which already had loft insulation in between them.

As we live in a bungalow I want to ensure we retain as much heat especially over the living room.
I'm aware now of compressed insulation under boards not being as effective as intended but I don't really want to start ripping up and raising the boarding on legs.
However can I lift the boards and fit something like the rigid loft insulation boards, say 75mm with a 25mm air gap and then put the boards back down
Appreciate any feedback/advice
 
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