The device E retains the aesthetic appearance of a roof when installed whereby the pitch of the roof is reduced a previously required angle. Preferably the device is an extruded rigid device located between a roof tile and a batten with a perpendicular lip E4 so that the device can be located on a batten. The device may be slightly curved. The device may include two ridges E2, E3 towards the rear to prevent movement of wind driven rain from being driven over the top of the device and entering the roof structure. The device may be used in conjunction with a roof with a secondary underlayment D which holds excessive moisture and is made from three layers including a resilient top layer, a hydrophobic film and a super absorbent polyester fleece on the underside.
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