Condensation and Mold - "Cathedral Ceiling/Roof"

[Pinoy]

Hello.
We bought a house in France and clearly have condensation problems in the lounge/roof.

The lounge is big - 7m X 6m - and has what the Frogs call a "Cathedral Ceiling".

There is no "loft" space in the lounge, just plasterboard, minimal insulation in places and then "roman" tiles.

Note - the way roofs are done here a somewhat different to the UK - our roman tiles/roof is very typical in the south of France. House built 1970.

Attached are various pictures and a graphic of how the tiles are put together on the roof - only the first row and last row of tiles are fixed...the remaining are just placed with no fixation.

The slope of the roof is fairly steep...see piccy with Christmas tree

You can see the minimal insulation with the inspection camera image - this is by the windows where the condensation is worse - presumably because warm air meeting the cold plasterboard and this is where the minimal/none insulation is.

Our heating is reversible air-con so not sure how this helps with lounge humidity and condensation.

Some advice on how to remedy this ?

I can take all the tiles off for access - as stated, they are not fixed - except first and last row.

I want to keep the existing plasterboard.

And can't even lower the ceiling for more insulation as it will fail building regs.

Between tiles and plasterboard the gap is approx. 10 cm.

Thanks in advance.

 

[datarebal]

We call them under and overs .
Looks like a vendee style property.

Anyway , reduce the moisture you generate Is a good start.
You could look at the multifoil insulation . Pretty common in France for at least 20 years

 

[Pinoy]

Thanks for reply...yes absolutely...but what is the best strategy for insulation...

Between plasterboard ceiling and tiles most of it is empty...no insulation...I have approx. 10 cm gap.

So I could do, vapour barrier on plasterboard and then maybe 8cm of something like this

https://www.castorama.fr/panneau-d-...V1u3tCh0HmAAoEAQYASABEgLJzvD_BwE&gclsrc=aw.ds

Only gives me an R of 3.7 but better than nothing..

 

[datarebal]

i was thinking more along these lines https://constructionmegastore.co.uk/product/superfoil-sf19bb-1-2m-x-10m-12m²/
im unsure if this particular brand is available in castorama but worth an ask at the superfoil site.. I know there are similar used in France, maybe ybs or something.

 

[Pinoy]

Thanks but R of 1.5....

 

[datarebal]

Check their site .

 

[catlad]

Woodburner will eliminate a lot of moisture. Those glorified hair driers create a lot of moisture!

 

[mick321]

wood burners are good, just had one installed this year.
superquilt we use in all are roofs!! very thermally efficient. and i've only just notice the post date

 

[Nige F]

Sacre Bleu !