Randolph Roofing Contractor

Your home’s roof is not only essential for shelter; it also plays a significant role in the curb appeal and overall well-being of your property. Over time, roofs can accumulate dirt, debris, moss, algae, and even mold, which can compromise their integrity and aesthetics. Regular roof cleaning is crucial to prolong its lifespan and maintain its appearance. In this blog, we’ll walk you through the steps to clean your roof safely and effectively.

Safety First

Before you start any roof cleaning project, prioritize safety

  • Use Proper Equipment: Ensure you have a sturdy ladder, safety harness, and non-slip footwear. If you’re not comfortable with heights or roof work, consider hiring a professional.
  • Weather Conditions: Choose a sunny day with mild temperatures. Wet or icy conditions can make your roof slippery and dangerous.
  • Protective Gear: Wear appropriate safety gear, including gloves, eye protection, and a dust mask if needed.

Materials You'll Need

Roof Cleaner

Depending on the type of roofing material and the issue you’re dealing with (moss, algae, stains), choose an appropriate roof cleaner or solution. Common options include oxygen bleach, trisodium phosphate (TSP), or a commercial roof cleaner.

Garden Hose or Pressure Washer

A garden hose with a spray nozzle attachment can be sufficient, but a pressure washer with a low-pressure setting may be more effective. Be cautious with high-pressure settings, as they can damage roofing materials.

Broom or Brush

You’ll need a soft-bristle broom or brush to scrub the roof gently.

Safety Rope

If you have a steep roof, consider using a safety rope for added security.

Step-by-Step Roof Cleaning Guide

Inspect the Roof: Before you start cleaning, assess your roof’s condition. Look for damaged or missing shingles, flashing issues, or any structural problems that might need attention.

Clear Debris: Remove leaves, branches, and any loose debris from your roof using a leaf blower or a broom.

Pre-wet the Roof: Use a garden hose to lightly wet the roof. This helps prevent the cleaner from quickly drying out and gives it more time to work.

Apply Roof Cleaner: Follow the manufacturer’s instructions to mix and apply the roof cleaner. Start from the bottom and work your way up to prevent streaking. Let it sit for the recommended time (typically 15-20 minutes) to allow it to break down stains, moss, and algae.

Scrub Gently: Using a soft-bristle broom or brush, scrub the roof gently. Be cautious not to damage the roofing material. Work in small sections.

Rinse Thoroughly: Use a garden hose or pressure washer on a low-pressure setting to rinse the roof thoroughly. Always rinse from top to bottom to prevent water from getting trapped beneath the shingles.

Prevent Future Growth: To discourage moss and algae growth, consider installing zinc or copper strips near the roof’s peak. Rainwater will wash the metal ions down the roof, preventing regrowth.

Safety and Cleanup: After you’ve completed the cleaning, ensure all cleaning solution and debris are safely removed from the roof and gutters. Dispose of any waste according to local regulations.

Regular roof cleaning is an essential part of maintaining your home’s appearance and structural integrity. By following these steps and prioritizing safety, you can keep your roof in top condition for years to come. If you’re unsure about the process or the condition of your roof, consider consulting a professional roofing contractor for guidance or assistance.


Northeast Home & Energy is a certified GAF shingle contractor. Visit our roofing page for more information about our roofing services in Central Mass.


If you have any issues with your roof, give Northeast Home & Energy a call and one of our friendly representatives will be glad to help with your roof maintenance and roof repair questions. We are a certified roofing contractor offering high-quality GAF shingles