The Ultimate Guide to How to Pressure Wash A Deck

Caring for your deck is crucial for retaining its aesthetics and utility in the long run, of course. Over time, decks accumulate dirt, mildew, algae, and stains from exposure to the elements. Maintenance not only makes the deck aesthetically appealing but also ensures your investment in the structure is well protected. A deck pressure washer effectively removes these contaminants, restoring the deck’s natural beauty while preventing decay and damage. 

Unlike other cleaning techniques, pressure washing cleans deeper into the grains of the wood and rinses out the new clear layer. The method can also be very useful when there are still blotches of discoloration that do not come off easily and to renew the beauty of the deck.

In this guide, we’ll explore the steps of pressure washing your deck and how it compares to other cleaning techniques, ensuring your deck remains in top condition.

Understanding Pressure Washing

Pressure washing is a process that utilizes high pressure water spray to eliminate dirt, mold and mildews amongst others from surfaces. There is the basic mechanism where the use of a high pressure pump to feed water and the use of a pressure washer nozzles that will direct the water at high velocities. Thus, this method works effectively on outdoor surfaces like decks where other cleaning methods can be less effective.

Types of Pressure Washers

When it comes to pressure washers, there are several types of pressure washers to consider.

Electric vs. Gas: Electric pressure washers are less noisy, lighter and are easy to maintain hence recommended for small decks. Gas pressure washers provide more pressure and portability which is suitable in removing dirt from larger decks or in cleaning difficult surfaces.

Cold Water vs. Hot Water: Cold water pressure washers are sufficiently useful for such decks, but hot water pressure washers are even more powerful and suitable for washing away greasy marks or hard-to-remove dirt.

Preparing for How Do You Pressure Wash a Deck

Before learning how to pressure wash a deck, make sure you have the right tools:

• A pressure washer (1,500–2,500 PSI)
• A 25-degree (green) or 40-degree (white) nozzle
• A deck cleaner or mild detergent
• A broom and a garden hose
• Safety gear (gloves, goggles, and non-slip shoes)

Safety Precautions

When it comes to pressure washing, safety should always come first, even before the process begins. Use protective equipment like gloves, goggles and slip-resistant shoes. Further, make necessary arrangements to cover plants, furniture or any other decorative item on the lawn using plastic sheets or tarp.

Initial Deck Inspection

First, observe your deck together with its surfaces in order to check if there are areas that require the replacement of the boards. This is important especially to prevent further damage when doing pressure washing activity. Clear the deck of any furniture, planters or any unnecessary item to make sure there is enough space to work on from a safety consideration.

Selecting the Right Pressure Washer and Nozzle

When cleaning, using the correct power washer pressure for deck maintenance is crucial. Too much pressure can damage wood, while too little may not remove dirt and grime effectively.  So, the pressure washer must have a PSI of 500-1200 and GPM of 2 to 4.  

The nozzle angle affects how pressure is applied. Select the best nozzle for power washer pressure for deck cleaning:

• 40-Degree (White Nozzle): Best for delicate decks and applying detergent.
• 25-Degree (Green Nozzle): Ideal for general deck cleaning.
• 15-Degree (Yellow Nozzle): Works for stubborn stains but should be used cautiously.
• 0-Degree (Red Nozzle): Too strong for decks and can cause damage.

How Do You Pressure Wash a Deck

Pressure washing is an effective way to restore your deck’s natural beauty by removing dirt, mold, and grime. Here’s what you need to follow: 

Step 1: Pre-Cleaning

Initially, take a broom and wipe the decks to get rid of small particles like leaves, dust, and twigs. If preparing for the application of a more significant cleaning process, use a deck cleaner or detergents with a brush or a garden sprayer. Put the cleaner for the time it usually takes to dissolve the dirt and the grime which takes about 10-15 minutes.

Step 2: Setting Up the Pressure Washer

Secondly, prepare your pressure washer by connecting the hoses with water and the washing machine. Ensure all the connections are well connected before turning the washer on. It is crucial to adapt the pressure settings to the material and the state of the deck start with a lower pressure and increase it if needed.

Step 3: Pressure Washing Technique

When operating the washer to clean your deck, standing properly and holding the washer firmly on the handle is important. Sweep across the surface in straight, overlapping motions slowly while maintaining an approximate 6-12 inch distance from the deck surface so that one will not hit the wood. Clean small areas at a time to do proper and enough cleaning to that specific area.

Step 4: Rinsing and Final Inspection

The final step is to wash the deck well after applying the pressure washing to remove any cleaning solution that may be left behind. The lower pressure is quite sufficient for this purpose; you can use a garden hose, for instance. A few things that the user should do after rinsing includes checking the deck for outstanding stains on whether they have been removed or not. The sealants and stains should not be applied on the deck until it has dried up fully.

Post-Pressure Washing Care

Allowing the Deck to Dry

Allow your deck to dry completely before applying any sealant or stain. Drying time can vary based on weather conditions, but generally, it takes 24-48 hours.

Inspecting for Any Needed Repairs

Check the deck for any damages revealed after cleaning, such as cracked boards or loose nails, and make necessary repairs.

Sealing and Staining the Deck

Sealing or staining your deck after pressure washing helps protect it from the elements and enhances its appearance. Follow a step-by-step guide for applying sealant or stain, ensuring you cover all areas evenly.

Common Mistakes to Avoid

Using Too Much Pressure

Applying excessive pressure can damage your deck by splintering the wood or causing water intrusion. Always use the recommended PSI for your deck type and surface.

Ignoring Safety Precautions

Neglecting safety measures can lead to accidents or damage. Always use protective gear and ensure surrounding areas are safeguarded.

Not Following Manufacturer Guidelines

Adhering to the manufacturer’s instructions for your pressure washer ensures effective and safe operation. Review the guidelines for optimal settings and usage.

Why You Should Pressure Wash Deck Before Staining

If you’re planning to stain your deck, the most crucial step is to pressure wash deck before staining. Without proper cleaning, dirt, mildew, and old finishes can prevent the stain from adhering correctly, leading to an uneven and short-lived finish. 

Here’s why it’s essential to pressure wash deck before staining:

• Removes Dirt and Mildew: Ensures a clean surface for stain application.
• Eliminates Old Finishes: Helps strip away old stain or sealant.
• Opens Wood Pores: Enhances stain penetration for a richer color.
• Prevents Peeling and Uneven Absorption: It leads to a smooth, long-lasting finish.

Tips for Pressure Wash Trex Decking

Can you pressure wash Trex decking? Yes, Trex is made of wood fibers and plastic, making it more durable than traditional wood but still susceptible to damage if cleaned incorrectly.

• Keep the setting below 1,500 PSI.
• Avoid concentrated nozzles that can leave streaks or marks.
• A mix of mild soap and water can often remove dirt without pressure washing.
• Always check the manufacturer’s recommendations to prevent voiding your warranty.

Tips for Maintaining Your Deck Year-Round

Regular Cleaning Schedule

Clean and inspect your deck regularly to prevent buildup and damage. Aim for at least once or twice a year, depending on the climate and usage.

Seasonal Maintenance Tips

Prepare your deck for different weather conditions by clearing snow or leaves and applying protective treatments as needed.

Protective Measures

Use mats and furniture pads to avoid scratches and dents. Keep your deck free from standing water and debris to prevent mold and mildew growth.

Conclusion

Properly pressure washing and maintaining your deck ensures its longevity and enhances its appearance. By following this guide on how to pressure wash a deck, you can extend its lifespan and keep your deck looking great for years to come. For more support or professional assistance, don’t hesitate to reach out to experts in deck maintenance.

Frequently Asked Questions (FAQ’s)