We are renovating an add on building which is used as a bathroom, it is built of concrete blocks. Having stripped out the old plaster board we found 80mm thick polystyrene panels used for insulation. I want to replace these, but thinking of using panels of only 40mm thick, so as to keep the room as big as possible. Will using thinner panels make a huge difference to the insulation, or am I worrying about nothing.
If you were to use Styroliner there would be a small reduction in thermal value with the reduced thickness, but at a like for like thickness, Styrofoam is more thermally efficient and it has the added benefit of acting as a vapour barrier.
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