Pressure Washing Safety Guide

PPE first

Goggles, gloves, boots, ear protection

Never point at people

Jet can cut skin and cause infection

Electrical safety

Keep leads and connections off wet ground

Pressure washer ratings

Domestic machines run 100-150 bar, professional 200-400 bar. Both can cause serious injury - the higher the bar, the more dangerous the jet.

Eye and skin protection

A high-pressure jet can embed dirt, paint chips, or stone fragments into skin at close range - always wear goggles and sturdy boots.

Ladder and elevated work

Never stand on a ladder while pressure washing - kickback is sudden and strong, and ladder falls are a leading cause of UK DIY injuries.

Electrical leads

Use an RCD-protected socket, keep connections off wet ground, and never run a pressure washer through an extension lead longer than 10 metres.

Pets and children

Keep pets and children indoors and well clear during cleaning - the noise alone can frighten animals and the spray can injure without warning.

When to call a pro

Anything above ground-floor level, large areas, render cleaning, or roof work is safer done by an insured professional with proper equipment.

Frequently asked questions

Can a pressure washer cut skin? Yes - at close range, a domestic jet can cut through skin. At distance it can still cause serious bruising and embed debris that may need medical treatment.

What PPE do I need? Safety goggles, sturdy boots with good grip, waterproof gloves, long trousers, and ear protection for any session longer than 30 minutes.

Is it safe to pressure wash a roof? We do not recommend DIY roof pressure washing - the fall risk is high and walking on tiles can crack them, leading to leaks that cost thousands to fix.

Related services and locations

Need help now, contact Jet Kings for advice and a free quote.

Need help applying this advice at your property? Call 07954 028819 or request a free quote.

Understanding Pressure Washer Ratings

Pressure washers are rated by two numbers: pressure (measured in PSI or bar) and flow rate (measured in litres per minute or LPM). Domestic machines typically operate at 100-130 bar and 6-8 LPM. Professional machines operate at 150-250 bar and 12-20 LPM. The higher flow rate of professional machines means they clean faster and more evenly — it is the volume of water, as much as the pressure, that does the work.

More pressure is not always better. Different surfaces have different tolerances, and using a pressure setting that is too high can cause permanent damage:

Concrete: Can handle higher pressure but can be etched if the nozzle is held too close or too long in one spot

Block paving: Medium pressure only. Too much pressure dislodges the blocks and blows out the jointing sand

Tarmac: Low pressure. High pressure softens and marks tarmac, leaving permanent damage

Natural stone: Low to medium pressure depending on the stone. Sandstone and limestone are particularly vulnerable

Wood decking: Low pressure with a fan nozzle. High pressure splinters wood and raises the grain

Render and painted surfaces: Do not pressure wash. Use soft washing instead

Essential Safety Equipment

If you are using a pressure washer yourself, you need:

Eye protection: Debris can be thrown up at high speed. Safety glasses or goggles are essential.

Sturdy footwear: Non-slip boots or wellies. The ground will be wet and slippery.

Waterproof clothing: You will get wet. Waterproof trousers and jacket make the job more comfortable.

RCD protection: If using an electric pressure washer outdoors, it must be plugged into an RCD-protected socket.

Common DIY Mistakes to Avoid

Starting too close to the surface: Always start with the nozzle at least 30cm from the surface and move closer only if needed. Starting too close is how most damage happens.

Using the wrong nozzle: The red 0-degree nozzle concentrates all the pressure into a single point — it can cut through wood and etch concrete. Use a fan nozzle (green or white, 25-40 degrees) for most surfaces.

Staying in one spot too long: Keep the lance moving. Holding the spray in one place will mark or etch the surface.

Pressure washing upward: Never spray upward at walls, windows or doors. Water forced under siding, render or window seals causes damp and damage.

Ignoring runoff: Think about where the dirty water is going. Do not let it pool against the house or run into drains that cannot handle the volume.

When to Call a Professional

Call a professional if you are cleaning natural stone, if the area is large, if there are stubborn stains that need treatment, if you are unsure about the right pressure for your surface, or if you simply do not want to spend a day wrestling with equipment. Professional cleaners bring commercial-grade machines, the right cleaning agents for stubborn stains, and the experience to get a consistent result without damage.

Frequently Asked Questions

Can I use a pressure washer on my car?

Yes, but use a wide fan nozzle and keep the lance at least 60cm from the paintwork. Never use the narrow jet nozzle on a vehicle — it will strip paint and damage seals.

What PSI is safe for cleaning a driveway?

For block paving, 1500-2000 PSI with a rotary surface cleaner is safe and effective. For concrete, 2000-3000 PSI is fine. For tarmac, stay below 1500 PSI. These are guidelines — the nozzle type, distance from the surface, and technique matter as much as the pressure setting.

Do I need to wear a mask when pressure washing?

Not usually for outdoor cleaning. If you are using cleaning chemicals or if there is a lot of airborne debris, a basic dust mask is sensible. For most driveway and patio cleaning, eye protection and sturdy footwear are the priorities.

Can pressure washing damage my pointing or mortar?

Yes. High-pressure water can dislodge deteriorated mortar between bricks or slabs. If your pointing is already crumbling, have it repaired before pressure washing or use a lower pressure setting. We always check pointing condition before starting.