When selecting the type of flooring material for your home there are considerations regarding the existing flooring types.
Most modern homes have a structural screeded (concrete) floor on the ground floor and suspended timber floors upstairs. A structural floor board will be specified as such by the manufacturer and be in the range of 18mm – 20mm and upwards. This type of board will be suitable for spanning across floor joists or battens and will provide structural integrity for any household item it has to support. If an existing floor is in place it is technically satisfactory to use an overlay product. This type of product does not need to be 'structural' and tends to be in the thickness range 12mm – 15mm. This type of board can be useful if marrying to other adjacent floor surfaces when an even flush height is required.