Lena Rivera
Flaking paint on PTW decks is a common problem with many possible causes, including moisture and humidity, inadequate surface preparation, poor-quality paint, and incorrect application. Before repainting, it is important to identify the cause of the flaking to prevent it from happening again. Once the cause has been identified, the old paint must be removed, and the surface must be cleaned, dried, and sanded. Then, a suitable primer and paint should be applied, taking care to follow the manufacturer's instructions.
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What You'll Learn
Proper surface preparation is key
Firstly, you should remove any loose paint from the deck using a stiff brush, scraper tool, or power/pressure washer. If there is a lot of paint to remove, you may need to use a grinding tool. Once the majority of the paint has been removed, sand the area until it's smooth and all paint is removed.
Next, ensure the surface is clean and dry before proceeding. This is critical because paint cannot properly adhere to a dirty or damp surface. You should allow the wood a period of days or even weeks to dry fully before painting. As wood is a porous substrate, it can appear and feel dry but still contain moisture that will need to naturally disperse over time. You should also be mindful of the humidity level in the air when painting, as this can also affect how well the paint adheres to the surface.
Before painting, you should also consider adding a sealant to enhance the durability of the paint. You may also want to apply a suitable primer, especially if you are painting bare wood.
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Use high-quality paint
If you want to prevent paint from flaking on your PTW deck, it's important to use high-quality paint. Poor-quality paint can lack the properties necessary to create a tight bond with the wood, making it prone to peeling or flaking.
When choosing paint, opt for a product that is specifically designed for decks. These paints provide better protection against harsh weather conditions and UV rays. For example, you could use Sherwin Williams exterior deck and floor enamel, which has been known to last for years without peeling. Benjamin Moore is another high-quality option, although it is pricey. If you're on a budget, you may want to consider Behr.
In addition to choosing the right paint, it's also important to use a high-quality primer. The primer creates a bonding layer between the old stain and the new paint, ensuring proper adhesion between the paint and the wood. A high-quality paint primer is especially important if you're painting over bare wood. When selecting a primer, be sure to choose one that is compatible with the paint you intend to use.
Once you've selected your paint and primer, follow the manufacturer's instructions on the label for application. Avoid painting in direct sunlight or when the weather is too hot or too cold. Apply the paint in thin, even coats, and allow proper drying time between each coat.
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Learn how to paint decking correctly
To paint decking correctly, you must first ensure it is clean. Use a stiff-bristled brush to sweep away debris and brush away dirt. Then, generously cover your decking boards with water and a cleaning product or dish soap. Scrub your decking boards completely clean, removing persistent stains, mould, and algae. Once you have thoroughly cleaned your boards, use a pressure washer on its lowest setting or a normal hose to wash away the soap and cleaner.
Before painting, you must also sand the deck. If the deck is in relatively good shape, you can use sandpaper or a sanding block to manually smooth rough edges. If there is old paint or stain on the deck, you can use a sander to remove it. If there is loose paint, you can also use a scraping tool. Once you have finished sanding, ensure the surface is clean and dry before proceeding.
Make sure you paint on a day when humidity levels are not too high, and the air is relatively dry. The best temperature for painting a deck ranges from about 50 to 90°F. Paint dries slowly in high humidity, and moisture is the number one enemy of paint because water vapour separates paint from surfaces. If your deck was painted when humidity or moisture in the air was high, it will affect how well the paint adheres to and remains on the deck surface.
When painting, use a brush or roller. Apply the paint using long, even strokes, and be sure to follow the direction of the wood grain. Allow the paint to dry, and apply a second coat if needed.
Finally, remember that once you opt to paint your decking, it will need regular maintenance.
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Remove loose paint with a scraper or pressure washer
If your deck is already covered in peeling paint, you'll need to get rid of it. Removing loose paint is essential to ensure the new paint properly bonds with the wood. You can use a scraper to remove loose paint from your deck. Scraping is a good option if you don't want to risk damaging the wood. However, if you have a lot of paint to remove, scraping can be time-consuming and laborious.
In this case, you might want to consider using a pressure washer. A pressure washer can be an effective way to quickly remove loose paint from your deck. It's important to be careful when using a pressure washer, as too much pressure can damage the wood. If you don't own a pressure washer, you can hire an industrial one. Make sure to keep the pressure washer at a safe distance from the deck to avoid damaging the wood.
After removing the loose paint, it's essential to clean and dry the surface thoroughly before proceeding. You can use a hose pipe to rinse the surface and then leave it to dry. Depending on the climate, this could take several days or even weeks. It's crucial to ensure that the wood is completely dry before applying any new paint or stain.
Once the surface is clean and dry, you can proceed with sanding the area until it's smooth and all paint is removed. After sanding, you can then apply a deck conditioner or primer before using a deck coating that is appropriate for timber decks.
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Sand, prime, then repaint
If your deck is painted and the paint is flaking, you can sand, prime, and repaint the affected areas. First, remove any loose paint from the deck using a stiff brush or scraping tool. You can also use a power washer to get rid of most of the old paint. Next, sand the area until it's smooth and all paint is removed. A belt sander will quickly sand large areas, but for tighter spots, you'll need a 1/4 sheet sander or an orbital sander. Make sure to wear a mask, earplugs, and gloves when sanding, as it's a messy and loud job. Once you've sanded the area, ensure the surface is clean and dry before proceeding.
Before you prime and repaint, consider the moisture and humidity levels. The number one enemy of paint is moisture because water vapour separates paint from surfaces. If you paint when humidity or moisture in the air is high, it will affect how well the paint adheres to and remains on the deck surface. So, make sure you paint on a day when humidity levels are not too high and the air is relatively dry.
When you're ready to prime, apply the primer to the sanded areas using a brush or roller. Allow the primer to dry completely before proceeding. Once the primer is dry, you can begin repainting. Use a top-quality paint and apply it with a brush or roller. Allow the paint to dry, and apply a second coat if needed.
To achieve the best results, use the correct products rated for deck surfaces. You might also consider staining and sealing your deck instead of painting. Stain soaks into the wood, whereas paint sits on top. Paint is more likely to peel and will fade in sunlight, especially bright colours. With stain, you can still see the wood grain, but you'll need to waterproof the deck after staining.
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Frequently asked questions
First, you need to identify the cause. Paint can flake due to poor-quality paint, incorrect application, inadequate surface preparation, or moisture and humidity. Once you've identified the cause, you can fix the issue and repaint.
You can use a stiff brush, a scraper or pressure washer to remove the paint. Then, sand the area until it's smooth and all paint is removed.
Choose a paint product that is suited to exterior concrete or wood and that is designed specifically for decks. For wood, you can use a water-based spar varnish as a primer. For concrete, try Behr Premium Plus Porch & Patio Floor Paint.
Ensure the surface is clean and dry before painting. You may need to wait several days or weeks for the wood to dry fully. Remove any dirt, dust, mildew, or old paint. You can use a mini-Ligno moisture meter to determine if the wood is dry enough.
Use the correct paint, proper tools, and prepare the surface well. You can also add a sealant to enhance the durability of the paint.
