Our 9mm Ogee Cover boards are a more decorative version of a traditional 9mm White UPVC Cover Board, used for covering existing timber fascia or window boards. They are available in a range of sizes from 150mm to 250mm.We sell our Ogee cover boards in packs as this minimises the risk of any damage in transit.Ogee cover boards are generally used for covering existing timber fascias, but they are also used on new installations. In new build applications a timber backing board is used behind the cover board to support it along its length (we recommend 25mm thick sawn timber). Cover boards are measured externally including the bottom return leg, ie. a 200mm Cover board will cover 191mm of existing timber. The return leg measures 42mm overall (33mm Internal).Ogee cover boards should be fixed using 2 x 50mm Polytop Nails no further than 600mm apart. This means that you should allow 18 nails for each 5m length.