Chatter Static

Does it exist here? I know less houses here have cavities in the wall because of the different bricks used but our post war dream does does have a cavity made up of the larger brique creuse then a 14 cm cavity and then a layer of the thinner brique paltrier you can see down the cavity in the some accessible places in the loft which means the cavity certainly is not offering any thermal benefits and the north facing wall of the house is very cold. So we are trying to find someone to fill it as we had one insulation enterprise in that want to tear down the inner layer of brick. That quote went in the bin the exterior wrap around is not an option just yet.

InVinoVeritas

Hi,

I'm not sure how good your French is but there's a good discussion here:-

http://www.forumconstruire.com/const...pic-201905.php

I once did a renovation on a house which was parpaing and brique - we made a small hole in the cloison when we took down an interior wall and all these little polystyrene balls came tumbling out!

So there is not an easy solution here and the recommended approach is, unfortunately, the devis you put in the bin!

Cheers IVV

Chatter Static

The newer balls are bonded with a glue as they are sprayed in so you don't get that or there is the good old fashioned foam which becomes a single mass once injected we have a whole house vmc being fitted to ensure ventilation doesn't become an issue. We have already had new windows fitted and our internals will be staying the same.

InVinoVeritas

I think the foam is going to prevent the air from circulating in the cavity in which case condensation could well become an issue.
IVV

Chatter Static

Condensation is predominately an issue if you don't have the correct ventilation if you extract the moist air then it shouldn't be an issue which is normally the case with some houses that have cavity wall insulation fitted. Sealing the box up to keep it warm method only works if it gets mechanical ventilation as we seal up these old boxes we have to think smarter in getting moister out.

If you have outer skin that lets in water then some insulations can act as a wick drawing the moister across the cavity but this doesn't happen with injected foam as it is a water proof barrier.

Chatter Static

Whilst we are on the subject of diy building related stuff I have another question..

Insulated plaster board this is normally glued to the wall to minimise the airspace and then some mechanical fixations are put in so that if there is a fire the plasterboard doesn't fall off the wall but what fixation would anyone recommend to go into brique paltrier as the normal ones to use in the uk would just shatter the briques here more than likely.

InVinoVeritas

This isn't the way it's done in France. The insulated plasterboard is glued in such a way as to maximise the airspace (minimum 1cm) so as to reduce the possibility of condensation. The glue is hydrofugé to avoid damp transmission.

Chatter Static

But it's still not fireproof as if the insulation part gets hot in a house fire it melts and then it is not more stuck to wall anymore, which is why I'm asking about some form of mechanical fixing to work with it.

InVinoVeritas

You can mount it on an "ossature metallique". Google Placo Saint-Gobain.

Chatter Static

I may do that as I have all the framing tools anyway...