I have around 4.5m² of surplus 20mm thick aerogel blanket rolled up. I bought it for insulating a room where I didn't want to lose much space. It is exceedingly efficient with a thermal conductivity of 0.017W/mK at 20°C, and it is A-rated for non-combustability.

Given that it was rather expensive to obtain, I would like to sell this surplus. I can see from the Passive House Store that, from them, it would cost around £230/m². I'm willing to part with it for around half that as I need it to be out of the way. So I would be happy to accept £500 for it.

I can provide a spec sheet and a CE mark cert.

There are various offcuts that could be used too. I will throw these in free or you could negotiate a price if you just want a small amount. For example, I've used small amounts when building extra insulation into existing doors.

The way I used it was to place it between battens and put boards over the top. It's on the internal side of an already insulated cavity wall so I decided to not be too worried about cold bridges from the battens and fixings. Ideally you would want a continuous layer with no battens but all my attempts at this failed, given my lack of appropriate skill and experience.

I prefer pickup from my location in Bristol. Wrapping and transport would be hard as the roll is quite heavy.