Mold Growing On MDF Board: How To Fix

The porous MDF board is porous and moldy.

Medium density fiber (MDF), board can promote mold growth in any part of your home, including the sub-floor.

The semi porous glue and fibers begin to expand with enough water. This allows mold to grow on the MDF board. A certified mold inspector might recommend that building materials be removed and replaced if they are found to have been damaged during a mold inspection. The mold inspector might have identified that the materials’ overall integrity, moisture level, or composition has been compromised. Although it may seem strange and unusual, mold growth could be hidden between layers of wood. Water damage can cause the wood to expand, creating gaps. This creates a space between the materials that encourages mold growth. This area quickly becomes moist and dark for mold growth.

MDF board can be used in items such as baseboards, bathroom cabinets, dressers and kitchen cabinets. Crown moldings, window moldings, exterior plywood and the sub-floor are all examples of MDF board.


Medium density fibreboard ( ) is an engineered timber product that is made by converting hardwood or softwood residuals to wood fibres. Then, it is combined with wax and resin, and formed panels using high pressure and temperature. Although it is composed of separate fibres, MDF can be used in a similar way to plywood. It is stronger than particle board and has a higher density.

Named after the difference in density of fibreboard. The name derives from the difference in densities of fibreboard. Large-scale MDF production began in North America in the 1980s.

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