Advanced search

How do I attach insulation boards to dwarf wall - glue????

(11 Posts)
RandomMess Tue 06-Jan-15 20:26:37

Can't find any info via google just where to buy them from!!

RandomMess Tue 06-Jan-15 20:55:27

Heeeeeeeeeeeeeeeeeelp sad

PigletJohn Tue 06-Jan-15 20:57:05

I think a long screw with a huge plastic washer under the head. Usually they would be fixed while the wall is being built, there is a special cavity tie that has an insulation retainer and leaves an air-gap on the cold side.

Go to the Knauf (or Kingspan or Celotex) website and see what fixing accessories they list. If not obvious, email the help desk. It may be listed as Drylining, which is probably what you are doing. You will need a vapour barrier on the room side.

I know how to retrofit to timber studs or rafters (there is a long nail with a big head), but not to a wall.

RandomMess Tue 06-Jan-15 21:08:31

Hmmm can I not just glue them grin

Hmm the dwarf walls are made with proper materials such as chipboard, this is to go in the void space as it's rather drafty...

Could I just fill up the entire void with basic loft insulation?

PigletJohn Tue 06-Jan-15 23:22:39

yes, but it is preferable to space it away from the outer leaf.

CWI is treated to make it water repellent. I doubt that loft mineral wool is treated. You can get cavity wall batts in builders merchants and Wickes, it is heavier and stiffer than loft quilt.

I would not use yellow fibreglass, which sheds irritant dust and fibres. Look for brown mineral wool treated with Ecose - it will be on the wrapper and is widely sold as Knauf or own-brands.

RandomMess Wed 07-Jan-15 20:10:16

So slope of roof, slight gap, pile up with suitable loft insulation?

PigletJohn Wed 07-Jan-15 21:32:04

Are these knee walls in a loft conversion?

Dwarf walls, to me, mean in a conservatory or subfloor.

RandomMess Wed 07-Jan-15 22:16:26

Well according to the internet they are dwarf walls grin

Chalet bungalow... But yes I guess knee walls... There is a triangular space along side the bedroom that I can crawl into that has a gale force draft blowing into it - that is the side of the house that gets the wind head on, it's on the top of a hill!

PigletJohn Wed 07-Jan-15 22:28:03

Ok then

Use mineral wool between the joists. Leave the eaves open so you can see most of the thickness of the brick walls.

You can fix rigid foam slabs to your knee walls, and can also slide it into gaps where there is plasterboard. Use 100mm if it will fit. You can use the big-headed nails. They are sold by places that sell insulation. The foam is finer and coated with silver foil, has more insulating power than the same thickness of mineral wool. It is better than plain expanded polystyrene. You can stuff wool into any gaps where the slabs do not fit tightly, and you can get matching silver tape to seal joints.

roneik Wed 07-Jan-15 22:40:43

RandomMess Wed 07-Jan-15 22:41:02

You can't see the proper eaves/rear of roof; the previous avid DIY owners have boarded them all over with something and then wallpapered it with woodchip... they used it as storage space of some sort.

I shall buy some rigid foam slabs and attach them somehow I guess!!!

Join the discussion

Registering is free, easy, and means you can join in the discussion, watch threads, get discounts, win prizes and lots more.

Register now »

Already registered? Log in with: