How to Patch a Hole in an Outside Deck Made From Treated Wood

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Things You'll Need

  • Utility knife

  • Sandpaper

  • Putty knife

  • Non-toxic wood cleaner

  • Soft-bristle scrub brush

  • Rag

Fill unsightly cracks or holes in your pressure-treated wood deck with wood filler.

Pressure-treated wood is infused with preservatives to protect it against rot as well as termite infestation. Treated wood is useful in outdoor structures that are consistently exposed the elements, and most wood decks use pressure-treated wood. Although highly resistant to rot, pressure-treated wood can still become cracked because of moisture and heat, or become punctured or gouged. A severely damaged plank should be replaced, but it's easy to patch minimal damage with wood filler.

Step 1

Remove any loose splinters from the areas to be patched, using a utility knife, a putty knife or sandpaper.

Step 2

Clean the areas to be patched to remove dirt, residue and stains and to ensure proper adhesion of the wood filler. Use a non-toxic wood cleaner. These cleaners come in a dry concentrate and are oxygen-activated when water is added. Dilute according to the manufacturer's instructions and use a soft-bristle scrub brush to scour the wood. Rinse the deck with fresh water and allow to dry.

Step 3

Pick up a scoop of the wood filler on the end of a putty knife and work it into the crack or hole. Make sure the crack or hole is completely filled, then scrape the blade of the putty knife flat across the surface of the wood to level off the wood putty.

Step 4

Clean up any excess wood filler from around the patched area with a damp rag.


Wood fillers are tinted to have a natural wood tone, but if this does not match your original deck to your satisfaction, the filler can be colored with a matching water-based wood stain.


Do not use a metal scrub brush to clean the deck as this will damage the wood fibers.


Mason Howard

Mason Howard is an artist and writer in Minneapolis. Howard's work has been published in the "Creative Quarterly Journal of Art & Design" and "New American Paintings." He has also written for art exhibition catalogs and publications. Howard's recent writing includes covering popular culture, home improvement, cooking, health and fitness. He received his Master of Fine Arts from the University of Minnesota.