Pressure washing is safe for brick in good condition when done at the right pressure, typically 800 to 1,200 PSI with appropriate nozzle angles. The risk is not to the brick itself but to the mortar joints. Deteriorating mortar can be eroded by high-pressure water, and once mortar is compromised, moisture enters the wall system. Older brick or brick with visible mortar cracking should be cleaned at lower pressure or with soft washing chemistry.
How brick differs from other siding materials
Solid brick is one of the more durable exterior materials you can wash. The fired clay units themselves can withstand reasonable pressure without cracking or absorbing water at meaningful rates. The vulnerability in a brick wall is the mortar. Mortar is softer than brick and degrades naturally over time, especially in climates with temperature cycling and UV exposure. In Fort Worth, freeze-thaw cycles, though less severe than in northern states, still stress mortar over decades. Water infiltration through compromised mortar is the primary damage risk in brick washing.
How to assess brick before washing
Before any pressure washing, a quick visual inspection of the mortar joints is worthwhile. Press your finger against a mortar joint. If the mortar crumbles or feels sandy rather than hard, it is deteriorating and should not receive standard high-pressure cleaning. Look for gaps, cracks, or missing sections of mortar along horizontal and vertical joints. If you find significant deterioration, the brick needs tuckpointing before washing, not after.
What pressure is appropriate
For brick in solid condition:
- 800 to 1,200 PSI with a 25-degree or 40-degree nozzle is appropriate for most residential brick cleaning.
- Maintain a standoff distance of at least 12 to 18 inches from the surface.
- Keep the wand moving and avoid concentrating the stream on a single mortar joint.
- Avoid zero-degree nozzles, which concentrate force in a small area and can etch both mortar and brick surfaces.
For brick with visible mortar wear or for older historic brick, dropping to 500 to 800 PSI with a wide-angle nozzle reduces risk substantially.
The efflorescence problem on Fort Worth brick
North Texas homes frequently develop efflorescence on brick, the white crystalline deposits that appear when water carries dissolved minerals through masonry and deposits them on the surface as it evaporates. Fort Worth's alkaline water and clay-heavy soil make this more common than in regions with softer water. Efflorescence is not a structural problem but it is persistent. Pressure washing removes the surface deposits, but if the source of moisture intrusion is not addressed, it will return. Specialized efflorescence cleaners combined with pressure washing produce better and longer-lasting results than pressure alone.
Organic growth on brick
Algae, mold, and mildew grow on brick surfaces, particularly on north-facing or shaded walls. Brick's porous texture provides more surface area for organisms to colonize than smooth vinyl. Soft washing with sodium hypochlorite is effective on organic growth on brick and kills the organisms rather than just displacing them. For heavy biological growth combined with surface dirt, a soft wash pre-treatment followed by a medium-pressure rinse produces the best result.
CARE's approach to brick in Fort Worth
CARE evaluates mortar condition before washing any brick surface and adjusts pressure accordingly. We use 800 to 1,200 PSI for brick in good condition and lower ranges for older or deteriorating masonry. For organic growth, we apply soft wash chemistry before rinsing. Call (945) 275-8031 or visit our house washing page to schedule an assessment.