Timber or direct dab

#1
Morning and happy new year chaps!

Customer has decided he now wants insulated plasterboard on the external facing walls over the existing plaster.

Never dabbed it directly which I know you can do.

Just concerned about trapping moisture.

What have you guys done previously?

I was thinking of plug and screw 4x1’s then screw the board to them.

Or is dabbing solid enough with no come backs??

I was overskimming until a minute ago!!

Cheers
 

ChrispyUK

Well-Known Member
#3
Morning and happy new year chaps!

Customer has decided he now wants insulated plasterboard on the external facing walls over the existing plaster.

Never dabbed it directly which I know you can do.

Just concerned about trapping moisture.

What have you guys done previously?

I was thinking of plug and screw 4x1’s then screw the board to them.

Or is dabbing solid enough with no come backs??

I was overskimming until a minute ago!!

Cheers
As long as the bpards are not foil backed, then dab is fine. If its an older house, with a 9" solid wall, then the spec is generally for 47mm PIR insulation. You can get a 62.5mm board (50mm PIR + PB) which is ideal.
Only prob is, they tend to be a bit cupped, so a pain to get flat and you'll need to use bonding to 'true' them up.
 
#4
As long as the bpards are not foil backed, then dab is fine. If its an older house, with a 9" solid wall, then the spec is generally for 47mm PIR insulation. You can get a 62.5mm board (50mm PIR + PB) which is ideal.
Only prob is, they tend to be a bit cupped, so a pain to get flat and you'll need to use bonding to 'true' them up.
Thanks pal,
Wouldn’t bother backing them up with a mechanical fixing also?
 
Love CBD

Wayners

Active Member
#6
Also foam to stick boards as an option