Membranes coverings excluding removal 10mtr 15mtr 20mtr 25mtr 30mtr 50mtr 100mtr 1000mtr Protansingle ply 800 1200 1600 2000 2400 3750 7350 70000 10 year Felt 360 540 720 920 1080 1600 3100 29000 15 year felt 420 630 840 1050 1260 1900 3600 31000 20 year felt 460 690 920 1150 1380 2100 3900 32500 Liquid 500 750 1000 1250 1500 2350 4100 38000 fibreglass 540 770 1040 1330 1600 2400 4200 39000 Epdm 490 740 980 1240 1400 2200 4300 42000