EPDM has established itself as a durable and long-lasting solution for flat roofs for over 50 years, commonly used in residential and commercial settings due to its durability and lifespan.
However, like any exterior surface, it requires periodic cleaning to maintain both its appearance and performance. This article will provide you with the information you need on how to clean your EPDM roof safely, which tools to use, what to avoid, and why regular cleaning is essential for rubber roofing longevity.
Why EPDM roofing needs cleaning
Over time, EPDM roofing can accumulate moss, lichen, algae, leaves, dirt, and debris. These buildups don't just look unsightly—they can trap moisture, increase the weight on the flat roof, and lead to surface degradation. Certain types of algae, such as green algae and black mould, can stain the surface and may eventually compromise the membrane if left untreated.
In addition, organic matter like wet leaves and moss can create water pooling areas. This increases the likelihood of water ingress, membrane damage or problems with the substrate, particularly in colder months when trapped moisture can freeze and expand.
The do’s and don’ts of cleaning EPDM
Do’s
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Use soft to medium-bristled brushes: These effectively dislodge dirt and moss without damaging the rubber membrane.
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Stick to mild soap and water: Harsh chemicals aren’t necessary. Warm, soapy water is typically all that’s required for effective cleaning.
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Use a hose, not a pressure washer: A standard garden hose can rinse away loosened debris without damaging the EPDM material.
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Inspect your roof during cleaning: Use this time to look for early signs of damage, such as punctures, lifting seams, or pooling water.
Don’ts
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Avoid abrasive tools like wire brushes: These can scratch or puncture the rubber surface.
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Don’t use petroleum-based or acidic cleaners: These can break down the membrane’s integrity over time.
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Never drag heavy equipment across the roof: It’s easy to tear or stress the membrane by dragging items across it.
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Avoid pressure washers: Even on a low setting, they can lift seams or weaken adhesives.
The best tools for cleaning EPDM roofs
Cleaning EPDM doesn’t require specialist tools, and with time and patience, this maintenance task is straightforward. We recommend the following tools:
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Soft-bristled brush or broom: Ideal for scrubbing without damaging the surface.
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Bucket of warm water with mild detergent: Dish soap works well and is non-aggressive.
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Garden hose: Useful for rinsing off loosened dirt and soap residue.
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Protective gloves and non-slip footwear: Safety first when working at height.
Specialised EPDM cleaners are available, but they’re rarely necessary unless you’re dealing with stubborn stains or preparing the surface for repair or resealing.
Precautions to prevent damage during cleaning
Before stepping onto your rubber roofing, consider the following precautions:
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Check structural safety: Ensure the roof can support your weight and that you have safe access.
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Avoid working alone: Always have someone nearby if you're accessing the roof.
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Protect seams and flashings: Don’t scrub too hard around seams or edges—these areas are more vulnerable.
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Work in dry conditions: Wet rubber can be very slippery. Choose a dry, mild day for cleaning.
Benefits of cleaning EPDM roofing during maintenance
Cleaning your EPDM roof during routine maintenance has several advantages:
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Improves longevity: Removing moss and algae reduces the risk of membrane breakdown.
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Keeps drainage systems clear: Clean roofs are less likely to have blocked drains or gutters.
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Highlights issues early: Cleaning gives you a close-up look at potential problems before they escalate.
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Enhances appearance: A clean rubber roof appears newer and well-maintained, which is important for both homeowners and commercial property managers.
How often should you clean your rubber roof?
For most properties, cleaning EPDM roofs once or twice per year is sufficient. Spring and autumn are ideal times—spring removes winter grime and moss, while autumn clears fallen leaves and prevents water buildup before winter.
In areas with heavy tree cover or frequent algae growth, more frequent cleaning may be necessary. Always combine cleaning with a visual inspection to keep your rubber roofing in top condition.
Final thoughts on how to clean EPDM
Cleaning your EPDM roofing doesn’t need to be complicated. With a few basic tools and the right approach, you can keep your rubber roofing clean, functional, and visually appealing for years.
Avoid harsh chemicals, skip the pressure washer, and focus on regular, gentle cleaning. Combined with periodic maintenance checks, this simple practice helps extend the lifespan of your EPDM roof and protects your investment.
We provide a variety of resources to assist with your DIY EPDM project, including how-to videos, installation guides, an EPDM roofing calculator, and on-site training with our certified professionals. Maintaining your EPDM roof by conducting regular checks is essential to achieving EPDM's decades-long lifespan.
