Across the UK, flat roofs are a popular choice for both commercial and residential properties. To ensure they last a long time and live up to their full potential, you need to know proper flat roof maintenance and what to look out for.
Just like any roof structure, a flat roofs need to be taken care of; a well-maintained flat roof is functional, long-lasting, and helps you avoid costly flat roof repair or replacement.
From regular flat roof inspections to removing debris, there are so many little things you can do to make sure your flat roof is in top condition, and taking care of minor issues will help you avoid big ones in the future.
In this blog, we’re going to go through how to maintain your flat roof and avoid costly repairs, and things to look out for!
Regular Inspections
At least twice per year and after extreme weather conditions, you should do a thorough inspection of the surface of your flat roof to look for anything that could be an issue.
Look out for any damage to the flashings and roof edges, pooling water, debris, signs of damage, or signs of water on the inside of the building. All of these issues are serious, potentially leading to problems like leaks. Neglecting routine maintenance like inspections can lead to significant damage further down the line.
It’s best to act on these quickly with a roofing contractor to prevent them from becoming worse. For most of the year, regular visual inspections are enough, but if you can, we recommend having a professional roofer inspect at least once a year, too!
Clear Debris From Roof Surface & Remove Overhanging Branches
The structure of a flat roof means that it does accumulate debris over time, which is a bad thing, as moisture can build up, and there can be a deterioration of materials. That’s why, as a flat roof owner, you should regularly clear debris and vegetation growth from the roof surface.
By regularly clearing, you will reduce clogged drains and stop excess moisture. It’s important to use a soft-bristle brush or leaf blower to do this, as shovels and rakes may damage the waterproofing system.
Your flat roof may also be under hanging branches; cut these back to reduce damage from leaves and fallen branches.
Proper Drainage System Management
When it comes to big issues like leaks, poor drainage is usually the number one cause, which is why clearing clogged gutters and checking drainage components every few months is so important.
Check that downspouts are properly directing water away from the building and ensure the roof has the correct slope or tapered insulation to move water toward drains. Without proper drainage, flat roofs can become waterlogged, leading to extensive damage.
Check for Ponding Water
Standing water is one of the biggest threats to flat roofs. If water pools for longer than 48 hours after rainfall, it might be that there’s a bigger problem.
Water can lead to structural damage and also mould growth on the inside of your home. Ponding can weaken the roof membrane, lead to leaks, and cause structural stress. Solutions may include adding extra drains, tapered insulation, or making any necessary repairs.
Inspect Flashings, Seams, and Edges
Commonly, these are the weak areas, and are where leaks often begin. After adverse weather, ensure flashings are intact and sealed. Check the seams between the roofing materials, look for separation or lifting, and pay attention to the roof edges, as wind can damage poorly secured sections.
Understand Your Roofing Material
Reinforced Bituminous Membrane (RBM)
This material is durable and cost-effective. When it comes to maintaining it, pay particular attention to cracks, blisters, or splits in the membrane and make sure all of the joints are properly sealed to prevent any leaks or further damage.
GRP Liquid Applied Roofing (Fibreglass Roofs)
GRP is a seamless and water-resistant solution. Inspect this material for any impact damage or wear to the surface. Every few years, you can reapply a protective topcoat to guard it against sun damage.
Single Ply Membranes (PVC, TPO, EPDM)
These materials are lightweight and flexible, with excellent weather resistance. Keep the surface clear of debris, check seams for lifting, and make sure drainage systems are flowing freely.
Metal Roofing
Strong and long-lasting, often made from steel or aluminum. On these roofs, look out for rust, loose fixings, or deterioration in sealants around joints.
Hot Melt Roofing
A fully bonded waterproof system, ideal for inverted and green roof designs. It’s generally low maintenance, but check protection layers and ensure drainage is flowing properly.
Lightweight Metal Tile
Provides the aesthetic of traditional tiles with the strength of metal. Inspect this material for dents, corrosion, or loose fixings, and keep surfaces free from leaves and dirt.
Green Roofs (Living Roofs)
Eco-friendly, insulating, and excellent for managing rainwater. Remove weeds regularly, check the drainage system, and monitor plant growth.
Rooflights & Exteriors
Bringing natural light into buildings while maintaining waterproofing. Clean surfaces regularly, check seals around the edges, and make sure flashing remains intact.
Know When to Replace vs. Repair
Maintenance can extend the lifespan of a flat roof, but at what point are ongoing repairs no longer cost effective? If the damage is minor and localised (small leaks, cracks), repair is usually enough.
Replacement should be considered if the roof is nearing the end of its expected lifespan (15 to 30 years, depending on material), there is widespread ponding, sagging, or membrane deterioration, and repairs are becoming more frequent and costly.
Our expert team can provide a professional inspection to help determine whether repairing or replacing your roof is the smarter long-term option.
Essential Tips for Safely Accessing Your Flat Roof for Regular Maintenance
Before any maintenance on your flat roof can begin, you’ll need to be able to safely access your flat roof. Here are some essential tips:
- Always have a sturdy, safe, well-secured ladder with someone at the bottom.
- Don’t work in adverse weather conditions.
- Wear non-slip shoes.
- If the roof is large or elevated, consider using a safety harness or hiring a professional with the right equipment.
