Advice re brick wall insulation

riclad

I want to insulate a brick wall using plasterboard.
ie plasterboard with built in insulation ,nailed on to battens spaced 2ft apart .Should i leave space inside battons empty, for air circulation ,or put in extra insulation there.
Should i put in 1 air brick ,for ventilation at ground level.
The wall is ten feet long, 9ft high ,with 1 window in the middle, 3ftx2ft .
Do i simply put a vapour barrier onto the battons ,just under the plasterboard.
IS the silver backing on plasterboard a vapour barrrier.
Should i ask for a particular brand, type of vapour barrrier sheet at the builders providers ,are they all the same?

i,m concerned about condensation or mould that might appear in future behind the plasterboard.
This wall is the exterior rear wall of the house.
So it needs to be well insulated, theres 1 layer of bricks, solid,
non cavity brick, 40 plus years old.

L1979

Hi Riclad,
Firstly, yes the foil backing is a vapour barrier.
This is a link to one of the suppliers for the type of fixing you discribe.
http://www.xtratherm.com/products/safe-r/sr-tb-mf-drylining-mech-fixed
You can also use the dot and dab technique, also explained on the website.
In my experience, dot and dab is easier as there are no problems with surfaces that are not 100% true, which will arise with battons no matter how straight and even you think your wall is.
In saying that, if you have services on the wall, a void at the rear of the board would be useful for running these.
Don't forget that you will need a thinner insulated board for around window reveals, to maintain a continuous vapour barrier and to avoid a cold bridge. If adopting dot and dab, there is a specific board with paper on the foil backing to ensure good adhesion.
Whichever way you choose to go, an air brick is not recommended!

And Good Luck!

BryanF

Riclad, as this is to the rear of the property, what about going with external wall insulation its a much better idea than drylining where there is only a single leaf structure

riclad

I,m going for internal insulation ,as i can do most of it myself,

i,d have to pay an expert ,to do external insulation.
i,ll be paying a plasterer and a painter ,and buying 5 windows ,and 2 doors, ie front and backdoor,
so i have to work to a budget.
its OLD house thick ,walls , so its just the rear wall , kitchen ,wall
needs insulation.
As a matter of fact ,i,m think of replacing the kitchen ,bathroom,wall,
9inch block,cavity,

20x10 approx, as its just 3inch thick wood, with almost no insulation .KITCHEN is just below bathroom,
all kitchen ,windows, bathroom windows, wood,
will be replaced and backdoor wood replaced .

kitchen ceiling, bathroom ,floor , will be replaced .

IE im replacing everything,kitchen,bathroom,
apart from, old roof,
and supporting wall s, wall on right ,left.
I UNDERSTAND , it would be more effecient to do just insulate
external rear wall,
total rear wall, is like 30x 17 ft , approx, it would be expensive.