Insulated plasterboards Celotex,Kingspan Gyproc.

[andy91]

Ive decided to tackle my staircase this winter. We suffer terribly with condensation and have installed a Nuaire Drimaster heat recovery system but I want to take it one step further so any advise gladly accepted.
My external walls to my inside stairs and a couple of the bedrooms suffer from condensation.
My plan of attack is to either batten wood on the walls with 50mm Celotex and add plasterboard or to use Gyproc Thermaline boards that have the foam and plasterboard all in one. My only problem with these are they are more expensive.
My walls are 9inch brickwork and I don't have a cavity.
My main concern are the walls sweating once the work has been carried out. Most have some sort of vapour control but I want to know if its best to fix direct to the walls or leave a gap and fix to wooden or metal battens.

Andy

[Meat-Head]

The bog at M-H-M is single brick, inside is thick polythene , then wooden battens. Then plaster board.

Vic my imganary friend from the pub says, use king span to stop the water been absorbed, he also tweeted about injecting silicon , not sure if he meant into the wall or one of his funny fetishes.

[gmb45]

sounds like an air flow prob as well, quickest and cheapest way to insulate walls is by the dot and dab method Tommy's Trade Secrets - How To Dot And Dab A Wall - YouTube also call dry lining, you dont have to skim them after just need to tape the joints.

[Meat-Head]

Air flow, yeah even my 1890 Victorian house has air bricks, have a snoop doggy snoop at the naybours houses .

Could be too much tv repeats "rising damp". Is it wooden floors ?

[ontherack]

a breathable membrane/vapour control/celotex is very good in situation you describe, dot-dab very good but imo in dryer conditions, I've used both systems. If condensation that bad ventilation is required, in walls, door/window grills, is it possible to treat exterior walls against penetrating damp/rising damp???

[gmb45]

If condensation that bad ventilation is required, in walls, door/window grills,

thats why i said "it sounds like an air flow problem".

[Meat-Head]

thats why i said "it sounds like an air flow problem".

Think you mean lack of airflow

[plasterer]

If your staircase is fixed to the said wall
You will be governed by the stringer
Anything added to the wall would cause you to loose the stringer
It's a case of knocking it back to the bare brick and dot and dab it Imo..... paul

[andy91]

If your staircase is fixed to the said wall
You will be governed by the stringer
Anything added to the wall would cause you to loose the stringer
It's a case of knocking it back to the bare brick and dot and dab it Imo..... paul

Ive done a bit of research and the cheapest option is 50mm celotex screwed direct on to the walls with battens on top of the celotex with 125mm masonary fixings and the battens to be roughly 3 inch wide and half inch thick. Will fill any major gaps with foam filler and foil tape to all joints so I don't get any thermal bridging or loss of performance. Regarding me worrying about water vapour the celotex has foil front and back. Will then put 8x4 plasterboard directly on top of the celotex. Ive paid about 20 quid a board 8x4ft.
Regarding the string your correct I will make a new string which I don't see being a major problem. Will lose a bit of space on my stairs but that's the least of my worries.
Will let you know if this makes a massive difference, boards arriving tomorrow.
Thanks for the advice guys

Andy

[andy91]

Well I celotexed the stairs fitted a new string and re plastered. Still got a but of painting to finish off but its made a massive difference.
Found a small patch of damp and came across this damp proof cream that you fill will a mastic gun and forms a barrier. Anyone with a damp problem this is a cost affective way of treating damp. Cost me 25 quid for 3 tubes and all you do is drill holes along the mortar line and pump in the cream. Cures in 6 weeks forming a waterproof barrier.

Andy.

[Meat-Head]

Against dk rules fir advertising. But where that cream come from? Or name?

thankssz

[andy91]

Against dk rules fir advertising. But where that cream come from? Or name?

thankssz

Ebay sell shed loads of different brands I bought this one.

DAMP PROOFING DPC INJECTION CREAM 3 X 400ML RISING DAMP TREATMENT | eBay