Clean-off tiles must be removed from their packaging and allowed to stand for 24 hours to acclimatise. Our clean-off tiles are suitable for laying without bonding due to the heavy-duty bitumen coating. However, to prevent the tiles from shifting/slipping and the edges lifting during use, we recommend that tiles are laid on a self-levelling tackifier. Direction of fibres: the arrow on the reverse of each tile indicates the direction they are to be laid in. Check before laying whether the tiles are to be laid in the same direction or in a chessboard pattern. Underfloor heating: clean-off tiles provide excellent heat insulation and therefore reduce the performance of underfloor heating. We do not recommend laying our tiles on underfloor heating systems.