Pressure washing guide
How To Clean Paving Slabs With A Pressure Washer
Pressure washing is one of the most effective ways to restore paving slabs, but technique matters. The wrong nozzle, angle or pressure setting can damage the surface permanently. This guide covers how to do it properly.
Pressure washing paving slabs can restore their original appearance, remove years of algae and staining, and make a patio or path look completely different within a few hours. However, the results depend heavily on technique. The same high-pressure water that cleans effectively can also etch the surface, damage mortar joints and strip natural stone if used at the wrong setting or angle. This guide covers how to clean paving slabs with a pressure washer safely and effectively for the most common slab types found on London properties.
45 degrees
correct lance angle when cleaning paving slabs to avoid blasting joints and damaging mortar
50 cm
minimum nozzle distance from the surface when cleaning natural stone to avoid etching
40 degree
wide fan nozzle is the correct choice for paving slabs, never a pencil jet or 0-degree nozzle
Preparation Before Pressure Washing Paving
Preparation determines the quality of the result. Rushing straight to the pressure washer without preparing the area correctly wastes time and can cause problems.
Clear the area completely
Remove all garden furniture, plant pots, ornaments and any items that could be hit by spray or water. Move them well clear of the area.
Sweep away loose debris
Sweep the area thoroughly to remove leaves, loose grit and debris. This prevents them from being picked up and flung by the pressure washer during cleaning.
Protect nearby plants and lawns
Lightly wet adjacent plants and grass before cleaning. Cover delicate plants with a tarp if using any cleaning solution. Dirty water runoff can damage plant roots.
Inspect for loose or cracked slabs
Check for any loose, cracked or subsiding slabs before starting. Pressure washing over these will worsen the damage. Any structural issues should be repaired first.
The Correct Nozzle And Pressure For Each Slab Type
TechniqueThe Correct Technique For Cleaning Paving Slabs
Technique has as much influence on the result as equipment. These are the key principles to follow regardless of the slab type being cleaned.
Work diagonally across joints
Always sweep at a diagonal to the lie of the slabs. This prevents the jet running directly along joints and blasting out mortar or sand.
Keep moving continuously
Never pause in one spot. A stationary jet concentrates pressure on a single point and can etch, pit or crack even hard paving if held too long.
Multiple lighter passes
For stubborn dirt, multiple passes at lighter pressure produce better results than a single heavy blast. This is particularly important on natural stone.
Never use a 0-degree nozzle
A pencil jet concentrates the full force of the washer on a tiny area. It will permanently etch and damage any paving surface it is used on.
Professional pressure washing London
Paving cleaned correctly by Cloud Nine
Cloud Nine cleans paving slabs of all types across London using commercial equipment and the correct technique for each surface. We match pressure settings and nozzle selection to the material before any cleaning begins. Contact us for a free quote.
Part of our guide
Pressure Washing Help And Guidance
Everything you need to know about pressure washing for London homes and businesses, from surface types to costs and what to expect from a professional clean.
Back to the guidePressure washing guide
How To Clean Paving Slabs With A Pressure Washer
Pressure washing is one of the most effective ways to restore paving slabs, but technique matters. The wrong nozzle, angle or pressure setting can damage the surface permanently. This guide covers how to do it properly.
Pressure washing paving slabs can restore their original appearance, remove years of algae and staining, and make a patio or path look completely different within a few hours. However, the results depend heavily on technique. The same high-pressure water that cleans effectively can also etch the surface, damage mortar joints and strip natural stone if used at the wrong setting or angle. This guide covers how to clean paving slabs with a pressure washer safely and effectively for the most common slab types found on London properties.
45 degrees
correct lance angle when cleaning paving slabs to avoid blasting joints and damaging mortar
50 cm
minimum nozzle distance from the surface when cleaning natural stone to avoid etching
40 degree
wide fan nozzle is the correct choice for paving slabs, never a pencil jet or 0-degree nozzle
Preparation Before Pressure Washing Paving
Preparation determines the quality of the result. Rushing straight to the pressure washer without preparing the area correctly wastes time and can cause problems.
Clear the area completely
Remove all garden furniture, plant pots, ornaments and any items that could be hit by spray or water. Move them well clear of the area.
Sweep away loose debris
Sweep the area thoroughly to remove leaves, loose grit and debris. This prevents them from being picked up and flung by the pressure washer during cleaning.
Protect nearby plants and lawns
Lightly wet adjacent plants and grass before cleaning. Cover delicate plants with a tarp if using any cleaning solution. Dirty water runoff can damage plant roots.
Inspect for loose or cracked slabs
Check for any loose, cracked or subsiding slabs before starting. Pressure washing over these will worsen the damage. Any structural issues should be repaired first.
The Correct Nozzle And Pressure For Each Slab Type
TechniqueThe Correct Technique For Cleaning Paving Slabs
Technique has as much influence on the result as equipment. These are the key principles to follow regardless of the slab type being cleaned.
Work diagonally across joints
Always sweep at a diagonal to the lie of the slabs. This prevents the jet running directly along joints and blasting out mortar or sand.
Keep moving continuously
Never pause in one spot. A stationary jet concentrates pressure on a single point and can etch, pit or crack even hard paving if held too long.
Multiple lighter passes
For stubborn dirt, multiple passes at lighter pressure produce better results than a single heavy blast. This is particularly important on natural stone.
Never use a 0-degree nozzle
A pencil jet concentrates the full force of the washer on a tiny area. It will permanently etch and damage any paving surface it is used on.
Professional pressure washing London
Paving cleaned correctly by Cloud Nine
Cloud Nine cleans paving slabs of all types across London using commercial equipment and the correct technique for each surface. We match pressure settings and nozzle selection to the material before any cleaning begins. Contact us for a free quote.
Part of our guide
Pressure Washing Help And Guidance
Everything you need to know about pressure washing for London homes and businesses, from surface types to costs and what to expect from a professional clean.
Back to the guide