Insulation wall with celotex

Pino79

Hi All,

I want to insulate a wall in my garage whose other side is in the living room. The wall is 2.4 x 2.4 m. I was planning to use 1200 mm wide and 50 mm celotex insulation board to insulate the wall. To install the insulation board to the wall, I was thinking to fix three wooden batten to the walls and put the insulation board between the batten. I then sandwich the insulation board by fixing plasterboard to the wooden batten.
My question is whether I can use 63 mm wide wooden batten and therefore leave a 13 mm gap between the insulation board and the plasterboad that close the wall.

Thanks

FreeBear

Pino79 wrote: »

Hi All,

I want to insulate a wall in my garage whose other side is in the living room. The wall is 2.4 x 2.4 m. I was planning to use 1200 mm wide and 50 mm celotex insulation board to insulate the wall. To install the insulation board to the wall, I was thinking to fix three wooden batten to the walls and put the insulation board between the batten. I then sandwich the insulation board by fixing plasterboard to the wooden batten.
My question is whether I can use 63 mm wide wooden batten and therefore leave a 13 mm gap between the insulation board and the plasterboad that close the wall.

Thanks

You could have a look at insulated drywall boards - These are a layer of plasterboard bonded to a sheet of PIR (or polystyrene) insulation and are often fixed with dot'n'dab (backed up by mechanical fixings). If you need an air gap between the insulation and the wall, this can be achieved by fixing battens to the wall and then attaching the boards with screws in to the wood.

From memory, I think the manufacturers recommend a larger air gap than 13mm, but the application notes will give "best practice".

Pino79

Thanks for your reply.
So you think I should leave an air gap betweeen the insulation board and the brick wall?

FreeBear

Pino79 wrote: »

So you think I should leave an air gap betweeen the insulation board and the brick wall?

Best thing to do is have a look at the technical datasheet for the product you intend to use. One from Kingspan for example - http://www.kingspaninsulation.co.uk/getattachment/cf47caa4-a6b4-4c64-aede-df58049f84df/Kooltherm-K118-Insulated-Plasterboard-pdf.pdf

For external walls, they recommend the use of 25x47mm battens suitably fastened to the wall - Include a layer of DPM between the timbers & brickwork to prevent rot setting in. If in any doubts as to the best method (battens or dot'n'dab), probably best to speak to their technical support guys.

I've got some exterior solid brick walls that I'll be insulating sometime next year, so also researching the use of insulated plasterboard.

Pino79

Thanks for the reply. I was thinking to put 3 vertical battens 75 mm deep and then fix orizontal batten let's say 25 mm deep to the vertical battens using braces. The orizontal batten will be stuck to the wall and support the insulation boards. The frame will then be closed by screwing plasterboard into the vertical battens

Pino79

Hi All,

do you know where I can find 8 mm wide and 100 mm long wall plug? I searched all DIT shops such wickes, BQ and so on but they do not have such wall plug

Grenage

It's an internal wall, so I wouldn't bother with an air gap. I'd personally put 100mm stud, fill with 100mm celotex, then cover it with foil backed plasterboard.

You could put some thin board insulation between the plasterboard and 100mm insulation (or use insulated plasterboard) to reduce thermal bridging - but not sure how much difference it would make.

stator

You can get all sorts of insulation fixings

http://www.toolstation.com/shop/p31309?table=no
http://www.screwfix.com/c/screws-nails-fixings/insulation-fixings/cat6250014?cm_sp=managedredirect-_-screwsfixings-_-insulationfixings