Polyethylene closed cell foam in sheets or cut to size
Jablite Premium Polystyrene Insulation board (L)1.2m (W)0.45m (T)50mm, Pack of 4 | DIY at B&Q
12 Large White Rigid Polystyrene Foam Sheets Boards Slabs - Size 2400mm Long x 1200mm Wide x 25mm Thick / 8ft x 4ft - EPS70 SDN Floor Insulation Sheeting Packing Void Loose
B&Q Rubber Semi-blind Black 25mm Grommet, Pack of 10 | Tradepoint
PLANCHA PVC ESPUMADO BLANCO 08mm 3050x2050 mm
Jablite Premium Polystyrene Insulation board (L)1.2m (W)0.45m (T)25mm, Pack of 8 | DIY at B&Q