On Jun 1, 11:04*pm, "george [dicegeorge]"
wrote:
Mineral wool for sound insulation is a lot denser than that for heat
insulation,
but heat insulation is so much cheaper as its subsidised,
so i'm planning on using heat insualting mineral wool under the
floorboards but stuffing it in very tightly.

i think this is a good idea, but im not an expert.

[g]

I'd first block all underfloor holes to next door with plaster or
cement mortar, being sure to leave no gap.

Stuffing mineral wool in tight puts pressure on the ceiling, and over
a fair area it adds up to quite a lot of force. I wouldnt. As long as
there isnt a damp problem there I'd be more inclined to go with
papercrete, its denser, has a finer porous structure, and stiffens and
damps anything its in conctact with.


NT