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Replace Butynol Roof

My roof has some flat sections covered with Butynol which needs to be replaced. The total area is 48 square meters. The area of each of the three sections is 39 square meters, 7 square meters and 2 square meters. I believe the Butynol is laid on top of chipboard (although the house plans clearly indicate it should have been construction plywood). If it is laid on chipboard then that will also have to be replaced with 17mm CAA H3 plywood.