a method for producing a panel sandwich for use as a wall , ceiling or floor panel comprising at least the following steps : providing a base panel made of wood - based material , arranging a sound - insulating layer above the base panel , arranging a cover panel above the base panel , pressing the sandwich , wherein an elastic plastic material is used to produce the sound - insulating layer , wherein according to a first alternative of the invention , a closed - cell foam is arranged as the elastic plastic material , wherein the plastic material before being introduced into the sandwich panel has an elasticity modulus under pressure of 0 . 25 mpa to 1 . 5 mpa , according to a second alternative of the invention , the elastic plastic material applied is a self - adhesive plastic material which connects the base panel to the cover panel , is elastic when set , has an elasticity modulus under pressure of 0 . 25 mpa to 1 . 5 mpa and has a minimum thickness of 0 . 3 mm .