Business Details
50+ Years
experience
Premium Roofing Solutions in London
Established in 1963, Guaranteed Asphalt has grown to become one of the UK's leading roofing contractors. As the sole manufacturer and installer of mastic asphalt and rubberised hot melt systems in the UK, we maintain a unique competitive edge in pricing and supply. Our expertise spans built-up felt, living roofs, single-ply membranes, and liquid applied coatings, developed through five decades of adapting to industry advancements.We hold accreditations including Safe Contractor, Construction Line, Achilles CHAS, and BBA certification, underscoring our commitment to quality and safety. With a heritage rooted in London but serving clients nationwide, we combine technical innovation with proven reliability to deliver durable roofing solutions for diverse construction projects.
Services
Mastic Asphalt
Hot Melt Systems
Built-Up Felt
Living Roofs
Single-Ply Membranes
Liquid Coatings
Details
- Year established: 1963
Highlights and features
- We have over 60 years of specialist roofing experience since 1963
- We are the UK's sole manufacturer/installer of mastic asphalt systems
- Our BBA-certified solutions meet rigorous industry standards
- We hold multiple health & safety accreditations including Safe Contractor
- We provide tailored roofing solutions for complex public sector contracts
Associations and certifications
- Safe Contractor
- Construction Line
- Achilles CHAS
- BBA
Services
Mastic Asphalt
Our proprietary mastic asphalt systems provide durable, waterproof flat roofing solutions. Developed through 60 years of specialist application, these BBA-certified materials offer exceptional longevity for commercial and public sector projects. The hot-applied methodology ensures seamless coverage, ideal for critical infrastructure requiring guaranteed performance.
Living Roofs
Guaranteed Asphalt's GuaraGREEN living roof systems combine ecological benefits with advanced waterproofing. Our engineered solutions support biodiversity while providing thermal insulation and stormwater management. Each installation uses tested components to ensure structural integrity and long-term vegetation viability across urban developments.
Hot Melt Systems
Our GuaraTEC hot melt polymer-modified bitumen systems offer fully bonded waterproofing for inverted roofs. The rubberised formulation enhances flexibility and crack resistance, particularly suited to structures requiring high-performance protection against weather exposure while maintaining thermal efficiency in modern construction projects.
Single-Ply Membranes
GuaraDIVERSE single-ply membranes provide lightweight, flexible roofing solutions for diverse applications. These durable synthetic polymer sheets resist UV degradation and chemical exposure, offering cost-effective installation with mechanical fastening or adhesive bonding options tailored to project-specific requirements across commercial developments.
Liquid Coatings
Our cold-applied liquid waterproofing systems form seamless protective layers for complex roof geometries. The rapid-curing polyurethane coatings adhere to various substrates without hot works, making them ideal for occupied buildings requiring minimal disruption during refurbishment projects across educational and healthcare sectors.
People
David Boyd
Designer
David Boyd leads design projects at Guaranteed Asphalt, combining technical expertise with practical application knowledge. With extensive experience in roofing system specifications, he ensures solutions meet both architectural requirements and performance standards.
Garo Susmanyan
Senior Designer
Garo Susmanyan specialises in technical design solutions for complex roofing projects. His expertise in BIM integration and system detailing ensures compliance with modern construction methodologies while maintaining Guaranteed Asphalt's quality standards.
Henri Taylor
Estimating Director
Henri Taylor oversees project cost assessments and tender submissions. With deep industry knowledge spanning decades, he provides accurate budget forecasting while maintaining the technical integrity of Guaranteed Asphalt's roofing solutions.
Questions
What roofing systems do you specialise in?
We specialise in mastic asphalt, hot melt systems, living roofs, single-ply membranes, and liquid applied coatings, offering comprehensive solutions for commercial, residential, and heritage projects.
How long have you been operating?
Guaranteed Asphalt has been providing roofing solutions since 1963, with our first contract completed in that year. We celebrated 60 years of specialist expertise in 2023.
Are you accredited for safety and quality?
Yes, we hold multiple accreditations including Safe Contractor, Construction Line, Achilles CHAS, and BBA certification for our roofing systems.
Which areas do you cover?
While based in London, we operate nationwide across the UK, delivering roofing solutions for projects in major cities and regional locations.
Can you handle public sector contracts?
We have extensive experience with public sector contracts, providing cost-effective, compliant roofing solutions that meet tight budgetary and programme requirements for educational, healthcare, and infrastructure projects.
