Laminate floors are installed on top of this underlay. It acts as a moisture barrier, gives the floor stability, support, noise reduction, and supports the locking systems in between planks to assure the sturdiest flooring installation.
Combilay is made of a 2mm thick aerothene that is laminated onto a clear 80 micron virgin plastic moisture membrane, with a 100mm overlap on the one side that is to be taped down.
It is 1250mm wide, and is sold by the running meter. For your quantity when purchasing, enter the number of meters you need.