Flat roofs are a popular choice for both residential and commercial buildings due to their sleek design and cost-effectiveness.
However, a common question among property owners is: How long does a flat roof last?
The lifespan of a flat roof depends on various factors, including the type of roofing material used, maintenance practices, weather conditions, and the quality of installation.
In this article, we will explore the typical lifespan of different flat roofing systems and provide insights on maximizing their longevity.
Felt flat roof
Built up felt roofing consists of two to three layers of bitumen sheet that have been bonded together using either hot bitumen or adhesive.
With an average life expectancy of 15 to 30 years, flat felt roofing is economical but tends to crack as it ages and the temperature changes.
Lifespan: 20 – 30 years
Torch-on felt flat roof
Torch-on felt is a process that was developed to reduce the need to pour and roll hot bitumen.
However, it does come with the risk of fire as operatives have to use a naked flame to heat the felt during installation.
Due to innovations in materials this has become less of an issue with the introduction of Self-Adhesive membranes. If installation is of poor quality, there is the chance of inadequate bonding, leading to leaks.
Lifespan: 20 – 30 years
Mastic asphalt flat roof
A blend of asphalt, limestone aggregate and limestone powder, mastic asphalt is the ideal material for applications that require a smooth, seamless, and durable surface.
Offering exceptional waterproofing integrity, mastic asphalt may be one of the most traditional construction materials in the world.
However, it continues to be popular and moving with times and now contains advanced polymer foundations to improve performance.
However, it can become brittle once set and needs thermal protection.
Lifespan: 20 – 30 years
GRP and fibreglass flat roof
Lightweight, strong, and durable, GRP roofing systems can take foot traffic and accommodate any movement that naturally occurs in buildings.
They come in a variety of colours and accessories, including trims, outlets, capping’s and tilt fillets.
Lifespan: 20 – 30 years
PVC single-ply membrane flat roof
PVC single-ply membrane is vinyl chloride monomer (VCM); the gas is polymerised to produce a vinyl resin that is then compounded to produce a material known for its flexibility, durability and colour options.
Suitable for all flat roof constructions and situations, they are ideal for domestic, commercial, and industrial flat roofs and are known for their value for money.
Lifespan: 20 – 30 years
TPO single-ply membrane flat roof
Thermoplastic Polyolefin (TPO) single ply membrane is a more recent option for flat roofing and unlike PVC single-ply membrane, doesn’t contain any chlorinated ingredients.
It has proven itself to have excellent weathering properties.
Lifespan: 15 – 30 years
EDPM single-ply membrane flat roof
EPDM single-ply membrane is reusable if the material has been loosely laid or fixed mechanically and is known to be highly durable.
In particular, it is highly resistant to weathering and UV light.
Lifespan: 20 – 30 years
It's important to note that these estimated lifespans are general guidelines, and actual durability may vary based on factors such as:
climate
installation quality
maintenance practices.
Regular inspections by a qualified professional, prompt repairs, and proactive maintenance are key to maximizing the lifespan of any flat roofing system.
How do you help ensure a flat roof last for longer?
Conduct Regular Inspections: Inspect the roof annually, looking for signs of damage, cracks, or wear. Address any issues promptly to prevent further deterioration.
Perform Regular Maintenance: Keep the roof clean, free from debris, and ensure proper drainage. Clear clogged gutters and downspouts to prevent water accumulation.
Promptly Address Repairs: If your new roof is still under warranty then any leaks, punctures, or damage you should contact your installer immediately. Ignoring minor issues can lead to more extensive damage and shorten the roof's lifespan.
Hire Professional Maintenance: Engage a professional roofing contractor for regular inspections and maintenance. They can identify potential problems early on and provide expert solutions.
In conclusion, the lifespan of a flat roof depends on several factors, but with proper installation, regular maintenance, and prompt repairs, most flat roofing systems can last between 15 and 30 years.
By following good maintenance practices and addressing issues promptly, property owners can maximize the longevity of their flat roofs and ensure they provide reliable protection for years to come.
Need help with your project? Get in touch with S&L Flat Roofing
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