Find out How to Waterproof an Internal Edge Corner on an L-shaped EPDM Flat Roof with Elastoform tape. The tape can also be used to waterproof external corners, awkward features, pipes, penetrations, drain outlets and any other feature where the ability to stretch and form the material is required. For more information please visit https://www.rubber4roofs.co.uk/shop/9-inch-elastoform-uncured-epdm-tape