Manthorpe Dry Ridge Tile in Grey. Dry Ridge Tile Measurements: Length: 450mm Width: 260mm Each Dry Ridge Tile comes with 1 screw to fasten it down.   Manthorpe’s Dry Ridge Tile System requires no wet trade and can be quickly and easily installed by one person, rain or shine. The interlocking system makes the tiles very easy to fit and, when completed, ensures an extremely secure finish. A patented double comb prevents entry of wind-driven rain and birds, while a 4mm fly screen provides 5,000mm2/m of continuous ventilatio…