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Roofs / Flat roofs

Roofs · flat roof Flat roofs

A flat roof that stands the test of time. We take care of every detail — from high-quality insulation to perfect waterproofing — for renovation and new build.

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Kessel-Lo · apartment building with flat roofs
Kessel-Lo · apartment building with flat roofs

Installation, repair and maintenance Comfort, durability and protection.

Does your flat roof need renovating, or are you looking for a reliable solution for a new build? We supply durable, energy-efficient flat roof systems.

With skilled craftsmen and high-quality materials, your flat roof is built to last — resistant to all weather conditions.

  • Renovation and new build
  • Insulation and waterproofing in one system
  • Room for installations or a terrace
Flat roofs: Flat roofFlat roofs: Roof coveringFlat roofs · Flat roof

Flat roof Insulation and waterproofing for a long service life.

Does your flat roof need renovating, or are you looking for a reliable solution for a new build? We supply durable, energy-efficient flat roof systems and take care of every detail — from high-quality insulation to perfect waterproofing.

Kessel-Lo · apartment building with flat roofs

Insulation and waterproofing for a long service life.

Insulation
PIR · λ 0.022–0.025 at minimum thickness
  • Installation, repair and maintenance
  • Modern materials for reliable waterproofing
  • Room for installations, a roof garden or a terrace

The build-up From roof deck to roof covering.

A flat roof works as one system: every layer has its own job.

  1. 01Roof deck

    Checked for stability and flatness

  2. 02Vapour barrier

    Stops moisture from inside

  3. 03Insulation

    PIR boards for maximum insulation at minimum thickness

  4. 04Roof covering

    Waterproof finish with neat upstands and roof edge profiles

Details Water must be able to drain away.

  1. Falls and drainage designed so that no water is left standing.

  2. Upstands, roof edges and penetrations finished watertight.

  3. Load checked in advance for a roof garden, terrace or technical installations.

  4. Insulation without thermal bridges at the roof edge.

Projects Flat roofs we built.

From an apartment building in Kessel-Lo to a renovation with a flat roof and PIR insulation in Lier.

BrusselsAntwerpLimburgEast FlandersFlemish BrabantWest FlandersWalloon BrabantHainautLiègeLuxembourgNamurANTWERPENLIMBURGOOST-VLAANDERENVLAAMS-BRABANTWEST-VLAANDERENWAALS-BRABANTHENEGOUWENLUIKLUXEMBURGNAMEN

26cities in 6 provinces
from Bruges to Namur

Flat roof More than a roof.

A flat roof offers room for technical installations, a roof garden or a terrace.

Flat roof with terrace
Flat roof with terrace
Flat roofs on a large scale
Flat roofs on a large scale
Kessel-Lo
Kessel-Lo
Grants and financing

We check what you are entitled to.

Since 2026, roof insulation in Flanders only qualifies for Mijn VerbouwPremie in income categories 3 and 4. We check your situation, help with the application and, if you wish, arrange a renovation loan through KBC.

Grants & financing →

Questions about flat roofs What our clients ask us.

Repair or renew?

We assess that during the site visit: the condition of the roof covering, the insulation and the roof deck determines whether a repair is enough or a full renovation is better.

Can I have a terrace or roof garden on my flat roof?

Yes, provided the roof deck can take the load and the build-up is designed for it.

Which insulation do you use?

PIR boards: maximum insulation at minimum thickness (λ 0.022–0.025).

Can I get a grant for roof insulation?

In Flanders, since 2026 roof insulation only qualifies for the Mijn VerbouwPremie grant in income categories 3 and 4. We review your situation and help with the application.

Free site visit · quote within 48 hours Ready for
a new flat roof?

Our specialist inspects your roof and sends you a tailored, no-obligation quote within 48 hours.

Phone
+32 333 20 630
Email
leads@gravagroup.be
Address
Sneeuwbeslaan 14, 2610 Wilrijk

Free 3D visualisation with your quote

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