Panel 33 adds a rubber barrier layer to the chipboard-and-felt format used in Panel 28. Both are supplied as 2400 × 600 mm boards, covering 1.44 m² per board. Their nominal depths are 33 mm and 28 mm respectively.
That difference affects the floor build-up and the specification. Choose using the complete construction, available depth and acoustic requirement. A board thickness on its own is not a prediction of the result in your building.
Compare the Hush floorboard range, then check each datasheet in the technical library.
