flooring advice pls.

i'm going to put down engineered floorboards & carpet in 2 rooms with concrete floors, the adjacent hallway is already tiled up from concrete by 30-38mm. i'm thinking of using wickes tongue & groove chipboard flooring http://www.wickes.co.uk/Channel-Drainage/Loft-Panels/invt/116420 as this is 18mm, leaving me with some options for both engineered floorboards & carpet + underlay to choose from.
it says on the wickes website that this chipboard is "loft panel" not to be used in damp areas(kitchen/bathroom), i'm laying them in the bedroom & living room on the lower ground floor, can anyone see any problems with using this chipboard or offer another cheap solution? i've had a look at marine ply but that's too expensive & i do not want to nail down any ply into the concrete as that might break the DPC below the concrete!
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