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How to Power Wash a Brick House: Tips & Guides

Writer: Service Directory
Service Directory
Aug 21
2 min read

How to Power Wash a Brick House: Tips & Guides

Brick is durable, but it can still be damaged by high pressure, harsh chemicals, or poor technique—especially around mortar joints. The goal is to remove dirt, algae, and mildew without etching the brick or blowing out mortar.

Use this guide to power wash brick safely and get a clean, even finish.

Quick link

For more power washing info and services, visit: https://www.readyjan.com/powerwashing

Before you start: check the brick and mortar

  • Inspect mortar joints for cracks or missing mortar.

  • Avoid power washing loose or crumbling mortar—repair first.

  • Cover outlets, lights, and nearby fixtures.

  • Pre-wet plants and protect delicate landscaping.

Choose the right pressure + nozzle

Start gentle. For most brick, a 25° or 40° nozzle is safest. Avoid a 0° nozzle.

  • Use lower pressure for older brick and softer mortar.

  • Keep the wand moving and maintain distance (start ~2–3 feet away).

  • Never spray upward into gaps where water can get behind the wall.

Disclaimer

Disclaimer: The information provided on this website [ReadyJan] and [WekLuhu] is for general informational purposes only. The information on this website, is not financial advice and should not be considered financial advice. We assume no responsibility or liability for any errors or omissions in the content. Your use of the site is solely at your own risk.

Step-by-step: how to power wash brick

  • Pre-rinse the wall from bottom to top to cool the surface and reduce streaking.

  • Apply a brick-safe detergent (use the soap nozzle / low pressure).

  • Let it dwell 5–10 minutes (don’t let it dry).

  • Rinse from top to bottom using overlapping passes.

  • Repeat lightly for stubborn areas instead of increasing pressure too much.

Common mistakes to avoid

  • Using too much pressure and damaging mortar.

  • Holding the tip too close and etching the brick face.

  • Using bleach incorrectly (can discolor surfaces and harm plants).

  • Letting detergent dry on the wall.

  • Forcing water into weep holes, vents, or gaps.

When to hire a pro

If your brick is older, the mortar is fragile, or you see heavy staining/mold, a professional can choose the right pressure and cleaners to avoid damage.

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