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2 sheets of plasterboard backed with 55mm insulation in good condition surplus stock after a building project can possibly deliver at extra cost
full spec here
http://www.insulationexpress.co.uk/Thermal-Laminate-Board/Celotex-PL4000-Thermal-Insulation-Board.htm Less
£40 each or £70 the pair can be delivered locally around bristol for a small fee
Location
Eastwood Crescent, Bristol, City of Bristol, bs4 4ss
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