Controlling Moss in a Brick Paver Patio

Moss thrives in damp, shaded joints. A broad-spectrum herbicide won’t work because moss isn’t a vascular plant. Target the moss specifically and alter the joint environment.

Approach 1: Non-Chemical / Mechanical

1. Pressure wash with a fan tip (1,500–2,000 psi) to blast out moss and organic debris. Avoid etching the brick.
2. Apply a moss deterrent: Spray a 1:1 mix of white vinegar and water, or a solution of 1 cup laundry detergent + 1 cup bleach in 1 gallon water. Let sit 15 minutes, then rinse. Test a hidden spot first.
3. Re-fill joints with polymeric sand (contains Portland cement and polymers) which hardens and resists moss colonization better than plain sand.

Approach 2: Moss-Specific Herbicide

Products like Lilly Miller Moss Out! (iron-based) or Bayer Advanced 2-in-1 Moss & Algae Killer target moss without harming surrounding plants when used as directed. Apply in dry weather; moss turns black and can be swept out.

Prevention

• Improve sunlight/airflow by limbing up nearby trees.
• Ensure the patio slopes ¼″/ft away from the house so joints dry quickly.
• Seal the pavers with a breathable, penetrating silane/siloxane sealer to reduce moisture absorption.

Neither method damages the brick. Repeat treatment annually in early spring or fall when moss is actively growing.