Chesterfelt Shed Felt Polyester Reinrced Green Mineral 10m x 1m. Chesterfelt Shed Felt is the traditional fibre based bitumen coated roofing felt with a protective and decorative green mineral finish. Unique polyester reinforced grid in the felt adds extra tear resistance and strength to the felt.. Superb quality polyester reinforced felt with a life expectancy of 15 years, suitable to use on roof with a pitch of 20 degrees or above. FREE bag of felt nails included with every roll you purchase. Quick and free delivery (most orders delivered within 48 hours). Buy with confidence from the Roofing Specialists!