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Flat roof

Flat roof

A finish for your roof
Sleek, functional and durable

Roof renovation by Cleys

A flat roof is not only a modern choice, it is also highly functional. Ideal for extensions, garages, bay windows or contemporary homes. At Cleys, we make sure your flat roof not only looks sleek but is also optimally insulated and watertight. This way, you are guaranteed comfort, durability and a refined finish that perfectly matches your home.

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Benefits of a roof renovation

Why choose Cleys for your roof renovation?

  • Tackle the main source of heat loss
  • Improve your EPC and save on energy
  • From removal to finishing
  • Combine with façade renovation for a complete building envelope
  • All techniques and materials under one roof
  • One contact person throughout the entire process
  • Choose the finish you prefer
  • Financial support through subsidies
  • Over 20 years of experience
  • 10-year warranty on all works
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The structure of a flat roof
  1. Current structure
  2. PIR insulation
  3. Roofing or EPDM

1. Current structure

A flat roof usually consists of a supporting structure in concrete or wood. There may already be (aged) insulation present, which is generally not a problem. If the finishing layer in roofing or EPDM is still in good condition, nothing needs to be done.
There are always two things that must be carefully checked for a flat roof renovation:

  • Are there cracks or blisters in the existing roof covering?
  • Is the supporting structure still in good condition? No sagging, moisture issues or damage?

2. PIR insulation

On top of the supporting structure, we install PIR insulation boards. This type of insulation is thinner, lightweight, and at the same time highly efficient. Even with less thickness, you still achieve a high insulation value, which is ideal for flat roofs. This saves energy, improves living comfort and ensures compliance with current energy standards.

3. Roofing or EPDM

The final layer is the waterproofing, which protects your roof against rain and wind.

  • Roofing (bitumen): a classic material, often applied in multiple torch-on layers. Strong and reliable.
  • EPDM: a synthetic rubber in one seamless membrane. Extremely durable, low-maintenance, and ideal for roofs with many corners and edges.
The importance of a watertight finish

Because a flat roof has only a minimal slope, rainwater drains more slowly than on a pitched roof. Proper waterproofing is therefore crucial. Even a small mistake can lead to leaks, moisture problems, or damage to the insulation and supporting structure.

Our craftsmen work according to the highest standards, paying close attention to every detail. This ensures:

  • Perfect overlaps: every seam between roofing membranes is carefully glued or welded.
  • Correct upstand fixations: the connection between horizontal surfaces and upstands is made fully watertight.
  • Precise detailing around chimneys, skylights and penetrations: no weak spots anywhere.
  • Slope and drainage control: sufficient pitch and smartly positioned drains prevent water pooling.

Durable waterproofing starts with the right choice of materials. At Cleys, we work exclusively with high-quality products that have proven their worth for many years:

EPDM

EPDM is a synthetic rubber material with an exceptional lifespan (30 to 50 years). It is UV- and ozone-resistant, elastic, and low-maintenance. EPDM remains flexible, adapts to temperature fluctuations, and does not tear. Perfect for those looking for a modern, reliable, and durable solution.

 

Roofing

Roofing (bitumen) has been a trusted choice for flat roofs for decades. It is applied in layers and reinforced with fiberglass or polyester. Roofing adheres firmly to the substrate through torching or bonding and is ideal for more complex roof shapes or renovations of existing roofs. Robust, reliable, and especially suitable for those who prefer a traditional build-up.

A roof renovation doesn’t stop at waterproofing and insulation. The finishing touches also determine how durable and aesthetic your flat roof will ultimately be.

Gutters

We renew or clad existing gutters so they are both functional and visually suited to your home.

  • Hanging zinc gutter: low-maintenance and classic.
  • Box gutter: sleek and modern, finished in the color of your choice.

Roof windows and skylights

Want to bring in more natural light? With Velux and Skylux roof windows or skylights, you create a brighter, more spacious, and more pleasant living environment, without losing insulation value.

Detail finishing

Roof edge profiles, cladding in Trespa, Cedral board, wood or aluminum, and neat connections around chimneys and penetrations make all the difference. These details provide a refined look and extend the lifespan of your roof.

THEY WENT BEFORE YOU.

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All projects
Total renovation with crepi in Kieldrecht Total renovation with crepi in Kieldrecht
  • Facade cladding
  • Crepi
  • Insulation
  • Facade insulation
  • Roof insulation
  • Windows & doors
  • Facade renovation
  • Roof renovation
  • Charging stations
  • Pitched roof
  • Flat roof
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Reviews
(203 Reviews})
Herman Fistels (Edegem) - “Highly professional installation of facade insulation at a competitive price. Rarely have I seen so much effort made to minimize disruption and tidy up so thoroughly after the work. Top-notch work!”
Johan Bergmans (Deurne) - “Cleys bv professionally insulated our rear facade and made it presentable again with crepi.”
Isabel Nuyttens (Sint-Niklaas) - "This company has many strengths: Speed: communication, site visit, quotation, and delivery. Communication: friendly and quick response to questions via email. Focus on a personal approach and customer service. Reliability and solid quality. Simplicity: the quote is clearly laid out, options can be easily adjusted, and they give clear advice about the materials and options. Customer friendliness: all staff are very sympathetic and take your wishes into account. Payments: are transparent and made in installments. This company is the right choice if you prioritize good communication, clear agreements, sustainable, long-term solutions, and quality without any headaches."
Christine Heremans (Ghent) - “From quotation to delivery, everyone provided perfect support... friendly... helpful with our questions... a top company... the end result is superb, thanks to everyone.”
Laurent Peeters (Edegem) - “Insulation of apartment facade, more than satisfied with this company! From quotation to completion: professional approach, always willing to provide more information. The installation team works extremely punctually and competently.”
Ellen Van Landeghem - “Very satisfied with this ‘young’ company. After visiting the site, we received a very clear and accurate quote. Excellent value for money. They respond very quickly to emails. The work was carried out very smoothly. Hats off to the team that came to work for us. The site was also left very tidy afterwards. We definitely recommend Cleys!”
Anke Decoster (Kruibeke) - “Very satisfied with this company, very quick, friendly, and personal contact, our side wall was sprayed with cork in record time.”
Thomas De Baets (Gent) - "Cleys exceeded all expectations with the renovation of our terraced house's facade! We appreciated the smooth communication with everyone involved, the manager, site supervisor, and craftsmen, as well as the accurate planning. Diego, our site supervisor, doesn't sell empty promises, but sound advice based on practical experience."
Greet Debusschere - “We had our facade insulated and covered with crepi. We are very satisfied with our collaboration with Cleys. A professional team from quotation to delivery. Everything was cleaned up nicely at the end of the work. Good guidance from site manager Diego. And a fantastic end result. Thank you, everyone.”
Bert De Hertogh (Beveren) - "We would like to express our sincere thanks and admiration for the CLEYS team. From the first contact to the final finish, the collaboration went smoothly. They carried out both our facade renovation and roof renovation with the utmost care and craftsmanship, and the end result is simply beautiful! The CLEYS team excels in professionalism and customer focus. They kept us informed of every step in the process and always worked according to plan, without delays. What's more, we immediately noticed how meticulous and detailed their work was. Their eye for detail made all the difference and ensured a finish that exceeded our expectations."
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