Services
Expert roofing and cladding solutions for commercial properties, delivered with precision and care.
View All Services
Proudly British Owned & Operated
Expert roofing and cladding solutions for commercial properties, delivered with precision and care.
View All Services
Proudly British Owned & Operated
Specialist commercial roofing tailored to the unique demands of your industry.
View All Sectors
Proudly British Owned & Operated
See how we've transformed commercial properties across London and the South East.
View All Projects
Proudly British Owned & Operated
Sika and Soprema approved commercial flat roofing contractors serving London, Essex, Surrey and Kent. Single ply, liquid applied, asphalt and built-up felt systems for all commercial building types.
Flat Roofing
Exall Group are specialist commercial flat roofing contractors serving London, Essex, Surrey and Kent. As Sika and Soprema approved installers, we design and install flat roofing systems for warehouses, factories, offices, hospitals, educational buildings and retail units of all scales — delivering every project to the highest standard with minimal disruption to your operations.
We work with the full range of commercial flat roofing systems — from single ply membranes and liquid applied waterproofing through to built-up felt systems and traditional mastic asphalt. Every system is specified to suit your building's structure, use, thermal requirements and budget, with manufacturer-backed warranties on all qualifying installations.
Our experienced team manages the complete project from initial condition survey and specification through to installation, detailing and final sign-off. We handle all access, waste removal and CDM compliance — giving you a single point of contact throughout. Recent flat roofing projects include University of the Arts London in Peckham, Cygnet Hospital in Beckton and the University of Hertfordshire De Havilland Campus in Hatfield.
See the Transformation
Our Work
In Progress
Failed asphalt flat roof overlay with Sikaplan SGK single ply waterproofing across 180m². Sikaplan laminated perimeter trims and new through wall parapet outlets throughout.
Green roof removal and single ply membrane replacement for University of the Arts London student accommodation in Peckham.
Restoring storm-damaged roofs with cutting-edge solutions and guaranteed durability.
At the University of Hertfordshire's De Havilland Campus, we replaced 3,500 sq/m of student accommodation roofs with durable Sika-Trocal membranes, ensuring lasting quality with minimal disruption.
A hospital ward faced water ingress from a roof balcony. Exall installed liquid waterproofing and interlocking rubber tiles.
Systems We Install
High-performance TPO and PVC membrane systems for commercial flat roofs. Sika and Soprema approved installers delivering fast installation with minimal disruption to operations. Ideal for warehouses and industrial facilities requiring long-term waterproofing.
Multi-layer torch-on felt roofing providing robust protection for commercial buildings. Cost-effective solution for large roof areas with proven durability. Suitable for high-traffic roofs and heavy equipment loads.
Seamless waterproofing for complex roof details and refurbishments. Kemper System and Alsan approved contractors. Perfect for areas with multiple penetrations, plant equipment, or where traditional systems can't be installed.
Traditional mastic asphalt roofing offering exceptional waterproofing and longevity. Ideal for flat roofs requiring pedestrian access or supporting rooftop equipment. Heat-bonded application creates seamless, durable surface for commercial properties.
Frequently Asked Questions
The best system depends on your building type, budget and performance requirements. Single ply membrane systems such as Sikaplan are ideal for large commercial flat roofs offering longevity and warranty backing. Liquid applied systems suit complex roofs with multiple penetrations. Asphalt is excellent for roofs requiring pedestrian access. We will survey your roof and recommend the most appropriate system for your specific situation.
Lifespan varies by system. Single ply membranes typically last 25-35 years. Built-up felt systems 20-25 years. Mastic asphalt up to 50 years with correct maintenance. All our installations come with manufacturer warranties — typically 20 years on qualifying systems.
In many cases yes. We always carry out a full condition survey before recommending replacement. If the underlying deck is sound and the membrane is only partially failed, an overlay or repair may be the most cost-effective solution. We will always give you an honest assessment of whether repair or replacement is the right answer.
We install commercial flat roofing across London, Essex, Surrey, Kent and the wider Home Counties. We cover the whole of the South East for large commercial projects.
Yes. We offer annual maintenance contracts covering inspection, drainage clearance and minor repairs to keep your flat roof performing at its best and protect your warranty. Regular maintenance significantly extends roof lifespan and prevents costly emergency repairs.
Exall Group are approved installers for Kemper System, Sika, Soprema and Alsan — meaning we are trained and certified to install these systems to manufacturer specification with full warranty backing on all qualifying installations.
Tell us about your project and one of our commercial roofing specialists will get back to you within 24 hours.
