Decided to go the route of insulation board, three sheets per door duck taped so they can form a screen elsewhere when not in use. Derek those sheets are very cheap I can only find Celotex at about £20 per sheet. Do you know if Keyline only local to you or nationwide?

Location: Sunny Devon

Hi Nick

what are the measurements of the door?

Location: Dover, Kent

Ok so a serious suggestion.... in some commertial workshops they have a curtain of 8" wide vertical strips of heavy plastic which you can just walk through or drive a car through.

The foil backed insulation is called Cellatex or similar. Unfortunately Nicks doors roll up at the top, so you cant add any significant thicknes to them. It would work well to insulate the roof, although in effective thickness' it is quite expensive.

The gold and silver "space blanket" plastic film stuck to the inside of the door would stop the drafts through the door itself.

Nick,

I've just Googled Celotex and found some cheaper than your £20 and in your County - Roofingsuperstore in Estover, Plymouth. Sheet size 1200 x 2400 x 25mm for £12.90 including vat.

I've also Googled Keyline Builders Merchants and they apparently have branches in Rockbeare, Exeter and Plympton, Plymouth and Newham Industrial Estate, Truro in Cornwall.

https://www.roofingsuperstore.co.uk/product/insulation-2/pitched-roof-insulation/celotex/celotex-tb3025-zero-odp-rigid-insulation-board-25mm-x-1200mm-x-2400mm.html

http://www.keyline.co.uk/store-finder

Jeff.

Location: Almost but not quite, the far North East of England

Thank you, investigating the very best price today.

Location: Sunny Devon

I have found Celotex for £12.87 inc. Vat at RGB which is only 4 miles away. I will post results when I have fitted them

Location: Sunny Devon

Found a much cheaper solution - going to be 34C here today!

Tony.

Location: Malvern, Melbourne, Australia