Flat Roofing Services in Christchurch
Every project begins with clear, straightforward advice. KNJ Roofing works closely with clients to recommend the most suitable materials and approach, ensuring the finished roof meets both practical needs and budget expectations. The team is experienced in installing and repairing a wide range of systems, including felt, GRP fibreglass and traditional lead roofing.
Felt Roofing: A Proven, Cost-Effective Option
Torch-applied felt remains a reliable choice for flat and low-pitched roofs. Installed in multiple reinforced layers, it provides solid protection against the elements while remaining cost-effective.
A typical system includes a carefully prepared timber deck, followed by layered underlays and a mineral-finished top coat. This construction creates a durable, weather-resistant surface available in a variety of finishes to complement the property.
GRP Fibreglass Roofing: Modern and Long-Lasting
GRP (glass reinforced plastic) roofing offers a seamless, hard-wearing finish that can last for decades with minimal deterioration. Its strength and resilience make it particularly suitable for roof terraces or areas subject to foot traffic.
Installed onto a dry, properly prepared deck, GRP systems provide a watertight barrier and are available in a range of colours. They are also commonly chosen as an alternative to lead, offering a similar appearance without the associated material value concerns.
Lead Roofing: Traditional Craftsmanship
Lead remains a preferred option for heritage properties and architectural detailing. KNJ Roofing provides expert installation of rolled lead for flat roofs, dormers, gutters and flashings, ensuring both durability and a classic aesthetic.

Improving Efficiency Through Insulation and Ventilation
When replacing or upgrading a flat roof, KNJ Roofing encourages property owners to consider enhanced insulation and ventilation. These improvements can significantly increase energy efficiency, helping to regulate indoor temperatures and reduce long-term energy costs.
Serving a Wide Range of Clients
KNJ Roofing works with homeowners, developers, contractors and commercial clients, delivering flat roofing solutions suited to projects of all sizes. Each installation is carried out with the same attention to detail and commitment to quality.
Why Professional Installation Matters
A properly installed flat roof is key to preventing water ingress and avoiding costly repairs. KNJ Roofing ensures every system is fitted to high standards, using materials and techniques designed for long-term performance.
Comprehensive Flat Roofing Services
Complete Project Support
From initial consultation through to installation and aftercare, KNJ Roofing manages every stage of the process.
Detailed Assessments
Each roof is carefully evaluated to determine the most effective solution.
Material Options to Suit Every Need
- Torch-on felt for affordability and reliability
- EPDM rubber for flexibility and low maintenance
- GRP fibreglass for durability and a seamless finish
Guaranteed Workmanship
All installations are backed by a 10-year guarantee, providing reassurance and confidence in the finished result.
Built on Quality and Transparency
KNJ Roofing combines experienced craftsmanship with premium materials to deliver flat roofing systems that last. Clients benefit from clear pricing, open communication and a professional approach from start to finish.






