Sourcing insulation panels

[Brian]

Hello all,

I need to add some insulation to a couple of stone exterior walls. As the house is quite old there is no damp proof course so I want to make sure that whatever I use for insulation will be suitable.

My plan is to have foil-covered expanded polystyrene sheet insulation in a 4x2 framework,  all covered with foil-backed plasterboard, with a plastic membrane as a DPC under the frame, insulation and plasterboard

1. Does this sound like a sensible arrangement?
   
2. What is the best material for insulation? I presume foil-backed expanded polyurethane sheets (like the UK spec Kingspan) but I have seen other products here in France
   
3. If foil-backed is the way to go, what's it called in French as I the only stuff I can find online is the non-foil backed stuff
   

Any advice would be gratefully received!

Thanks in advance,
Brian

[Admiral]

Like your thinking.

Foil backed poly boards are the way to go.  Big Mat Ardibus in Montmorillon sells them.

Good idea to go in with a sample of what you actually want to avoid confusion.  As with everything in France, there are several different species of what is basically the same product.  Only with differences.

Ask to speak to Etienne.  He does speak English although you'll have to poke him with a sharp stick.

He'll ask for your total square metre coverage and sell in bulk.  And deliver if you want.

Mr Bricolage sells a version but only sells by the single sheet which ends up incredibly expensive.

As for the name in French.....there are several which is why you need that sample or a very clear idea of what you're asking for.

[Brian]

Thanks Admiral for some great advice. If only I had a sample of foil backed sheet... I'll try to get a bit next time I'm in the UK.