Using a pressure washer on wooden decking can be an effective way to remove dirt, grime, mould, and moss, keeping your outdoor space looking fresh and well-maintained. However, it’s important to approach this task with caution to avoid damaging the wood. Wooden decking can vary widely in terms of type and quality, which means an improper use of a pressure washer may cause splintering, gouging, or peeling of wood fibres. Understanding the proper techniques and settings is essential to ensure that your decking benefits from the cleaning process rather than being negatively affected by it.

First and foremost, setting the pressure washer to the correct power level is key. Too much pressure can strip away the surface of the wood, leaving it rough and vulnerable to further damage. Aim for a PSI (pounds per square inch) setting of 500-1200, depending on the density and durability of your decking material. Holding the nozzle at an appropriate distance, usually around 12-18 inches from the decking, will help prevent concentrated pressure from causing harm. It is also advisable to opt for a fan nozzle attachment rather than a concentrated jet attachment, as it distributes the water pressure more evenly across the surface.

When pressure washing wooden decking, the technique used plays a crucial role in achieving effective results without inflicting damage. Always move the nozzle in the direction of the wood grain to avoid splinters or uneven wear. Start at one end of a plank and slowly move across the decking in smooth, overlapping passes. Avoid holding the washer in one spot for too long, as this can erode the wood and create an uneven appearance. If you notice any signs of splintering or damage, stop immediately and reassess your settings and technique.

It is worth noting that while pressure washing can clean your decking thoroughly, it should not be done too frequently. Excessive use can weaken the wood over time and even strip away any protective sealant. Following up the cleaning process with a fresh coat of sealant or wood oil can help to restore the wood's protective layer and enhance its appearance. Additionally, consider sweeping or brushing your decking regularly to minimise the accumulation of debris, reducing the need for frequent pressure washing altogether.

Ultimately, pressure washing wooden decking is perfectly fine as long as it is done responsibly and with the right tools and techniques. By carefully managing the pressure level, using the correct nozzle, and following best practices, you can maintain your decking’s integrity and aesthetic appeal. Remember to take the necessary precautions and ensure that your decking is appropriately sealed to keep it looking its best for years to come.