Tricky insulation project

[adders21]

Hi All,

I want to insulate between internal plaster board and external timber cladding.
In the picture below you will see a red arrow pointing to the area.
Between the internal plaster board and the cladding there is only the roof membrane.
I can gain access in the roof void from below the area and I was thinking of filling the area with a foam filler.

I've done a bit of research and found I need a slow-rise, so as not to burst the cladding of and closed cell to prevent moisture.

Can any one recommend a product or an alternative method?

Untitled

• adders21
• 5 Oct 2010
• 1

Thank you in advance for your replys.
ian

 

[mointainwalker]

Given the way foam expands, sticks, hardens etc, I can see no way you are going to be able to be able to comprehensively fill a gap of 60 -80 cm ( guessed by no/size boards) in the way you seem to think is possible.

That apart, I believe ( not sure) that foam is open-cell , but as far as moisture-vapour is concerned , I believe that is also irrelevant as the moisture penetration is going to be .......... ? Next to nothing.

You do not say what the decorative state of the room is, but if you want to make a decent job of this, I suggest removing the pb, insulating with exp polystyrene or fibre-wool batts and placing a polythene vapour-barrier between the pb amd the insulation.