We are about to lay 100 square yards of reclaimed parquet flooring, so would like some advice on a suitable adhesive. Some is going onto concrete, but most onto board that we have to put down (18mm). The parquet is T&G 22mm thick approximately. It was originally stuck down with bitumen, but has been cleaned. However the surface is still black which means there will be traces of the tar/petroleum compounds. Three questions! What would be a suitable sealer for the concrete? What would be a suitable board - OSB or WPB? What would be a suitable adhesive(s)? Thanks.