Timber or direct dab

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drpplastering

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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
 
drpplastering said:
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
Click to expand...

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.
 
ChrispyUK said:
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.
Click to expand...
Thanks pal,
Wouldn’t bother backing them up with a mechanical fixing also?
 
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