Concrete Subfloor 2 Hard Wearing Carpenter Rich Step 9mm Carpet Underlay £4.77 – £477.37 Select options Superb All Rounder Sale! Underlay4u Magic 10mm Carpet Underlay £3.04 – £302.78 Original price was: £3.04 – £302.78.£2.52 – £251.31Current price is: £2.52 – £251.31. Select options