Anyone used expanding foam to insulate under floor?

[sjws1888]

Hi

I've got a suspended timber floor in the sitting room and I can get into the crawl space below the floor without taking any of the floor up, so I am planning to use spray foam insulation on the underside of the floor boards to cover any gaps and therefore stop drafts coming up between the floor boards and to insulate.

here is the stuff I'm planning to get for the job:
http://www.foamseal.co.uk/index.php?cPath=3800003

I'd love to hear from anyone who has actually used this sort of material before - in particular do you actually get the coverage that the manufacturers claim? Any other tips would be appreciated too.

Cheers

 

[Static]

You will probably need to run full face mask and breathing apparatus for spraying in such a confined space..

Bear in mind that if you need to take up any boards in the future you will most likely need to replace the board..

Might want to check into how fire resistant it is..

 

[rjm2k]

Also bear in mind that the house which blew up last year apparently had an old fella using expanding foam cans in the cellar !

 

[rjm2k]

FYI

http://www.bbc.co.uk/news/uk-england-nottinghamshire-25319071

 

[geraldthehamster]

Hi

I've got a suspended timber floor in the sitting room and I can get into the crawl space below the floor without taking any of the floor up, so I am planning to use spray foam insulation on the underside of the floor boards to cover any gaps and therefore stop drafts coming up between the floor boards and to insulate.

here is the stuff I'm planning to get for the job:
http://www.foamseal.co.uk/index.php?cPath=3800003

I'd love to hear from anyone who has actually used this sort of material before - in particular do you actually get the coverage that the manufacturers claim? Any other tips would be appreciated too.

Cheers

That sounds horrendous, and isn't the usual way to do it. If you can get under the floor OK, I would stuff the space between the joists with rock wool insulation, and support it with chicken wire or plastic mesh. This will both insulate and prevent draughts.

Celotex or Kingspan board insulation is even more effective, but is easier to do with the floorboards up, so you can seal the gaps with expanding foam.

I really wouldn't try to use any kind of spray foam, working in the floor void - if you're lying or crouching you'll end up with it all over you, and it's horrendous stuff to get off. Quite apart from the fumes, as others have mentioned.


Cheers
Richard