Dryseal is usually recommended to be laid to a finished fall of 1:60, as with all flat roof design. There is no detrimental effect on Dryseal if the system is laid flat (e.g. in a box gutter), as it is unaffected by standing water. The recommendation for a 1:60 fall is for aesthetic and roof safety reasons, to encourage surface drainage and minimise ponding. Dryseal is semi-rigid, so it is very suitable for vertical work, e.g. on a mansard or parapet cladding, and needs no extraordinary precautions, as it does not ‘slump’.