Iwi

[Recci]

When you have a Internal wall insulation , why do you need a 25mm gap?

 

[Notch7]

That’s an interesting question

I believe the gap allows and damp / condensation to dissipate - although it’s a narrow, unvented cavity with no drain at the bottom.

I have heard you can have the insulation tight to the wall, then vertical battens to screw the insulation tight and create somewhere for fixing plasterboard.

 

[noseall]

When you have a Internal wall insulation , why do you need a 25mm gap?

To prevent water bridging across (the joints in) the boards.

Newer more expensive systems don't require it nor do they require the inner leaf to be built first.

 

[noseall]

When you have a Internal wall insulation , why do you need a 25mm gap?

Need or end up with?

 

[Bod ...]

I've used a material called ultrotherm on my ground floor.

Not totally convinced and it was expensive