Screw holes on the underside where the plasterboard was attached. Please see photos showing this attached to a rear glass annex. I bought the annex but do not need the roof. Topside dimensions: 3820 x 1170mm Underside dimensions: 3645 x 1080mm.Front height: 255mm Back height: 325mm. The item "Bay Window Porch Canopy Roof UPVC / GRP 3.8 x 1.1m" is in sale since Saturday, September 19, 2020. This item is in the category "Home, Furniture & DIY\DIY Materials\Doors & Door Hardware\Doors". The seller is "baranelogg8v" and is located in Wakefield. This item can't be shipped, the buyer must pick up the item.