This is a common question when it comes to keeping your deck clean. Whether you’re trying to get rid of dirt, moss, or just freshen up your outdoor space, pressure washing can seem like an easy solution. But can you pressure wash decking? Is it safe for your deck? The answer depends on the type of material your deck is made of and how you use the pressure washer.
In this guide, we’ll cover everything you need to know about pressure washing your deck. We’ll look at the possible risks, suggest alternative cleaning methods, and explain safe ways to pressure wash without causing damage.
Understanding Your Decking Material
Before using a pressure washer, it’s important to know what type of decking you have. Different decking materials handle pressure washing in different ways, so you need to be careful.
1. Wooden Decking
Wooden decking is the most traditional choice and includes popular woods like cedar, pine, and redwood. While you can pressure wash wooden decking, it requires extra care. The high pressure can easily splinter wood, strip away soft fibres, or leave it irreparably damaged.
2. Composite Decking
Composite decking, made from a mix of recycled wood fibres and plastic, is more durable than wood. It can be pressure washed, but only with the lowest pressure setting and by following the manufacturer’s guidelines. Using too much pressure can scratch the surface or cause colour fading.
3. Painted or Stained Decking
If your deck is painted or stained, proceed with caution. A high-pressure stream can strip paint from a painted deck. Stained decks are less likely to be damaged, but using too much pressure can still strip or lighten the stain unevenly.
Risks and Potential Damage of Pressure Washing
While pressure washing is effective, it’s not without risks. Applying high pressure incorrectly or without understanding your decking type can lead to costly mistakes. Below are some common risks:
- Splintering and Cracking: For wooden decking, overly high pressure can cause splinters or crack boards, especially older or softer wood.
- Surface Erosion: Composite decking may experience surface erosion or scratches, reducing its aesthetics and lifespan.
- Paint and Stain Removal: Painted or stained decks can lose their finish entirely, leading to uneven appearance or costly reapplications.
- Water Damage: Overuse of water, particularly with low-quality decks or worn wood, can lead to water absorption, weakening the decking over time.
To avoid these issues, it’s essential to use the correct techniques and consider alternative cleaning methods where appropriate.
Alternative Deck Cleaning Methods
For those who feel pressure washing might be too risky, there are plenty of alternative methods to clean your deck effectively:
1. Scrubbing with Deck Cleaner
- Use a stiff-bristle brush and a specialised deck cleaner.
- This method is gentle and ensures you won’t damage the surface.
2. Hose and Spray Nozzle
- For light grime or dust, a standard garden hose with a spray nozzle attachment can do the trick.
- This is a safer option for painted, stained, or composite decking.
3. Vinegar and Baking Soda Solution
- A natural and eco-friendly alternative, this DIY solution effectively tackles stains and mildew without harsh chemicals.
4. Oxygen Bleach
- Unlike chlorine bleach, oxygen bleach is less harsh and safer for wooden and composite decking.
These methods may take more time and effort but are safer options if you’re not confident in using a pressure washer. By the way, we’re here to help you get the job done safely and efficiently.
Can You Pressure Wash Decking? Yes—If Done Carefully
If you decide to pressure wash your decking, the key is to do it safely and without causing damage. Follow these steps to ensure optimal results:
1. Choose the Right Pressure Washer
Use an electric pressure washer with a pressure rating between 500 and 1500 PSI (pounds per square inch). Gas pressure washers often have higher PSI and may be too aggressive for decking.
2. Select the Proper Nozzle
Choose a nozzle with a wide spray angle, ideally between 25 to 40 degrees. It disperses the water pressure and reduces the risk of damage.
3. Sweep and Clear the Deck First
Remove all furniture, plants, and decorations. Sweep away debris to prevent scratches during pressure washing.
4. Test on a Small Area
Always test the pressure washer on a hidden corner of your decking first to ensure it won’t cause any damage.
5. Maintain the Correct Distance
Hold the pressure washer nozzle at least 12-16 inches from the decking surface and spray at an angle to avoid gouging.
6. Use Controlled Movements
Work in smooth, overlapping strokes to ensure even cleaning. Avoid focusing on one spot for too long.
7. Use Cleaning Solutions if Needed
For tough stains or mildew, use a deck-safe cleaning solution compatible with your pressure washer.
Post-Wash Deck Maintenance & Aftercare
Once your deck is clean, proper maintenance will ensure it stays looking fresh for years to come.
1. Inspect for Damage
After washing, inspect the decking for cracks, splinters, or areas needing a touch-up.
2. Reapply Finishes
If you’ve removed paint or stain during pressure washing, now’s the time to reapply it. Choose high-quality stains or paints designed for outdoor decking to protect against weathering.
3. Seal the Deck
For wooden decks, sealing prevents water absorption, protects against rot, and prolongs the life of the wood. Composite decks usually don’t need sealing.
4. Regular Cleaning
Commit to cleaning your decking a few times a year to prevent the build-up of mould, algae, or dirt. This reduces the need for extensive pressure washing.
5. Protect with Furniture Pads
Place furniture pads under table and chair legs to prevent scratches or dents.
Pressure washing can be a great way to clean your deck, but if done the wrong way, it can cause damage. It’s important to know what material your decking is made of, take the right precautions, and follow safe cleaning steps.
We at Cardiff Window Cleaner Ltd can take care of it for you! Get a quote today and let us make your decking shine.
Can You Pressure Wash Decking FAQ
Can you pressure wash composite decking?
Yes, you can pressure wash composite decking, but you need to be careful to avoid damage. Use a low-pressure setting and a fan-tip nozzle to clean it properly without hurting the material.
Can you pressure wash wooden decking?
You can pressure wash wooden decking, but you need to be careful. Use a low-pressure setting and test it on a small hidden spot first to make sure the wood doesn’t get damaged or splinter. After cleaning, always seal the wood properly to keep it protected.
Can you pressure wash a painted deck?
You can pressure wash a painted deck, but you need to be careful. High pressure can remove the paint, so it’s best to use low pressure and wash gently. This way, you can clean off the dirt without damaging the painted surface.
Can you pressure wash a stained deck?
You can pressure wash a stained deck, but it’s important to avoid using high pressure. High pressure can strip away the stain. Instead, use low pressure to gently clean the deck. This way, you can remove dirt and grime without damaging the stain or the deck’s colour.
