under floor insulation

[mikegc]

Hi,

I am putting down new engineered flooring over existing floorboards and I am thinking of insulating between the joists using mineral wool suspended with some chicken wire or plastic similar.

I have two questions, will it make much difference if I am already putting underlay and another layer of wood over the top. I am also worried the insulation will increase the chances of damp in the joists.

The main question is, should I bother to do it?

Thanks!

 

[TheVictorian]

I did exactly that and it has made a difference. As long as the subfloor is well ventilated then it shouldn't have any damp issues.

 

[mikegc]

I'm going from no insulation and draughty floorboards to insulation and sealed floors so I'm hoping for a big difference. Just wish I had bought the insulation when it was cheaper last year!


My joists are just under 100mm so will be insulating to that level.

 

[mikegc]

Did you use a breathable membrane like they use in roofs or a mesh. I think the membrane would work better to reduce draughts and keep the heat in the insulation?