The British Standard for flooring - BS 8203 - specifies that all timber bases should be covered with a suitable fabricated underlay such as plywood. For chipboard, it is recommended to securely cover with a minimum 5.5mm thick flooring grade plywood that complies with BS EN 636 and BS 8203.
Use ARDEX Feather Finish direct to treat any joints or rough patches, or to cover screw heads.
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