Updated February 2020
Preventing Mildew on a Deck
Mold growth is a common problem that can arise during the deck staining process. Today we talk about what causes your deck to turn black from mold and how to prevent it. If you have encountered mold during your deck staining project, we want to hear from you. Feel free to leave a comment below with pictures of your deck stain projects.
How to Prevent Mold on a Deck from returning.
One of the biggest enemies of a deck is mildew and mold. With moisture being ever so present outdoors, the mold is bound to find its way onto your deck. Typically, mold will begin to appear on the more shaded sides of a deck. Anywhere there is less sun means there is more moisture present making conditions ideal for mold growth.
Once mold infiltrates a surface it only continues to spread if conditions are favorable. Mold can get under wood stains and sealers and cause them to fail prematurely. Mold will also rot and decay wood if it is neglected and jeopardize the integrity of the deck and decrease its longevity.
To remove mold from a deck, clean the surface with a deck cleaner containing sodium percarbonate or a mix of bleach and water. We are not fans of bleach on wood but sometimes this is best to help get rid of the mold. If you use bleach, mix at a ratio of 1 part bleach to 5 parts water. Use a stiff brush or pressure washer to clean away the mold, dirt, grime, and graying. After cleaning a wood deck, the surface should be recoated with a protective deck stain. Composite decks can also be protected with the proper sealer.
To prevent mold from reoccurring you can use a product called Wet and Forget. This product can prevent mold, mildew, lichen, and algae from appearing. For maintenance even if mold is not present, spray Wet and Forget onto the deck’s surface and let it do the work for you. No scrubbing, rinsing, or pressure washing involved. This is a non-caustic product that contains no bleach or acidic material. It can be used on almost any type of wood or composite decking.
Apply Wet and Forget to your deck surfaces every 6-12 months as a mold preventative. Even if no mold is present, Wet and Forget will kill and prevent unseen mold spores from growing. It is safe to spray on top of most wood stains and sealers. Wind and rain will continue working with the Wet and Forget product overtime to keep mold away. Use as needed to prevent mold on a deck and to keep all your exterior wood surfaces clean and mold free.
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