This post was updated on January 18, 2022
How To Fix Black Spots on Deck?
We get this question about 50-100 times a year at DeckStainHelp.com. Well, actually consumers want to know what causes the black stains to form around their nails or at the bottom of the metal furniture on their deck. Most are not aware that metal, when it rusts, will turn black in wood.
Nails Rusted on Deck
Nails rusting on a deck is not common but can happen from time to time. We have found that this happens for a couple of reasons.
- Non-Galvanized Nails were not used during the building process. When a deck is installed you must use Galvanized Treated Nails and Screws or Stainless Steel Nails and Screws to prevent the black rusty spots from occurring around the nails.
- Galvanized nails or screws were used but over time the protective coating has failed. This could take many years to occur but does happen. We have also seen instances where the floor was power sanded and this shaved or removed the protective coating of the galvanized nails or screw from the top.
Metal Patio Furniture Rusted on Deck
Rust on a deck can also happen from older metal furniture left in place for many years. We have also seen this happen from grills and other metal objects. Always be careful when placing metal objects on your deck and lean towards using aluminum or stainless steel items.
How To Remove Black Rust Spots on Deck
In many cases, you can use a deck wood brightener to neutralize out the rust spots and restore the natural color. This issue with this method is it will not prevent the nails or screws from rusting again once it rains. The only way to stop the rust from coming back in this scenario is to remove the nails or screws and replace them with new stainless steel or galvanized screws. This is not an easy option as it may cause damage to your deck boards as you try to remove the rusting nails/screws.
How To Brighten A Deck Video – DeckStainHelp.com
If you have any questions about fixing black rusting nails on your deck, please ask below.
Please post a picture or two as well!