


A green, slippery patio is a common problem for homeowners, caused by algae, moss, and mildew thriving in damp and shaded conditions. Not only does it look unattractive, but it can also become a safety hazard. If you’re tired of your patio going green, follow these simple yet effective tips to keep it clean, safe, and looking its best all year round.
The green film on patios is usually caused by:
Algae – A fast-spreading organism that thrives in damp, shaded areas.
Moss – Common between patio joints and on porous surfaces, particularly in wet conditions.
Mildew and Mould – Fungi that grow in humid, poorly ventilated environments.
These organisms develop in moist conditions, particularly on porous materials like stone and concrete. Without proper maintenance, they can quickly take over your patio.
Regular sweeping and occasional pressure washing will help remove dirt, debris, and organic matter that promote algae and moss growth.
Trimming back trees and overhanging plants allows more sunlight to reach your patio, helping to keep it dry and discouraging the growth of green organisms.
Ensure water drains off your patio rather than pooling. If necessary, adjust the slope of the surface or improve surrounding drainage.
For a hassle-free solution, use a professional-grade cleaner like Joint-It Algae Remover. This product effectively removes algae, moss, and mildew without damaging your patio surface. Simply apply, leave to work, and rinse off for a clean, green-free patio.
Sealing your patio prevents moisture from penetrating the surface, reducing the chances of algae and moss taking hold. Joint-It Premium Seal is a long-lasting, breathable sealer that protects against water damage and staining, preventing your patio going green.
Moisture and dirt often accumulate in patio joints, encouraging weed and moss growth. Opt for a durable jointing compound like Joint-It Simple, which is permeable yet resistant to weed growth, ensuring a clean and stable patio surface.
Joint-It provides professional-grade solutions for cleaning, sealing, and maintaining patios. Our range of products are easy to use, highly effective, and long-lasting, ensuring your outdoor space stays clean and inviting all year round.
By following these simple steps and using trusted products from Joint-It, you can enjoy a beautiful, slip-free patio without the hassle of constant upkeep. Say goodbye to the green and hello to a pristine patio! For more information on why you should seal your patio for patio maintenance, read “Why You Should Use a Patio Sealer: The Key Benefits.”
Gary Duffy is Co-Founder of Joint-It and plays a key role in the company’s technical, product and commercial development. With a background in the paving and landscaping industry, Gary co-founded Joint-It in 2011 alongside Martin Fox, driven by a clear understanding of the practical challenges contractors face on site and the need for better-performing jointing solutions. That first-hand industry experience helped shape the development of Joint-It Simple and laid the foundations for the wider Joint-It range.
Since founding the business, Gary has been closely involved in product development, technical support and sales strategy, helping grow Joint-It from its early beginnings into an established manufacturer of jointing compounds and hardscape products serving the UK, Ireland and international markets. As Technical Director, he has also played an important role in the company’s international growth, including the development of distribution agreements in markets such as France, Italy, Sweden and Dubai.
Gary’s contribution remains closely tied to the practical side of the brand. Across Joint-It’s website and customer-facing content, he is a trusted technical voice on product selection, application advice, maintenance guidance and common paving challenges, reflecting the company’s focus on combining product innovation with real-world trade knowledge. Customer feedback also regularly highlights Gary’s technical expertise, responsiveness and hands-on support, reinforcing his longstanding involvement in the business.