Wooden frame placed loosely all round to improve the compressive strength of the floor. To allow you to provide the necessary stability when changing floor coverings and to fasten the top profile rail, the wooden frame must be screwed in place at the doorways.
Two-layer structure, MDF 22 GL (22 mm medium-density fibreboard) as the base and pressure-stable low-density fibreboard WF 08 Hopa - 8mm

Wooden frame L: 1000mm W: 44mm H: 30mm
Passage wood L: 250mm W: 44mm H: 30mm - incl. 2 pipe grooves