Flat Roofing Including Felt and GRP Systems

Flat Roofing

We provide expert flat roofing solutions using high-quality Felt and GRP (Glass Reinforced Plastic) systems, ideal for extensions, garages, and modern builds. Our flat roofs are designed for durability, weather resistance, and low maintenance. Whether you need a new installation or a replacement, our team ensures a clean finish and long-lasting protection for your property.

Reason For Choosing Us

Smart Roofing London 

⦿ A trusted family business built on values and reliability.
⦿ 15-year guarantee with official certification for your peace of mind.
⦿ Committed to sustainability & eco-friendly solutions for a better future.

Quality Material

Premium materials for strong, lasting roofs—quality first, always.

Fully Insured

Professional roofing with full safety and assurance — your trust, our priority.

Guarantee

Quality Guaranteed. Durable roofs, expert repairs—no extra cost if issues arise.

Process

Felt Roofing Process

Felt, or modified bitumen, roofing typically uses a three-layer system, often applied with a torch for a waterproof seal. 

 
  1. Surface Preparation: The existing surface must be cleaned, dry, and free of debris. 
     
  2. Venting Base Sheet: A layer of venting base sheet is applied to prevent moisture buildup. 
     
  3. Reinforced Felt Underlay: A reinforced felt layer is added for extra protection. 
     
  4. Mineral Cap Sheet: A final layer, often a mineral cap sheet, provides UV and physical damage resistance. 
     
  5. Application: The felt is often adhered by torch-on application, using heat to melt the bitumen and bond it to the roof. 
GRP (Fibreglass) Roofing Process
GRP roofing creates a durable, seamless, and long-lasting waterproof membrane. 
 
  1. OSB Deck Installation: 
    OSB (Oriented Strand Board) boards are installed to create a flat, suitable roof deck. 
     
  2. Edge Trims: 
    GRP edge trims are installed to create a border around the roof area. 
     
  3. Resin Application: 
    A mixture of resin and a catalyst is applied to the roof surface and the bandage on the trims. 
     
  4. Fibreglass Laminating: 
    Fibreglass matting is then cut and laid over the resin, which is “wet out” using a roller to saturate the glass strands. 
     
  5. Topcoat: 
    A protective topcoat is applied once the laminate is no longer sticky, typically within 24 hours. 
Key Considerations for Both
  • Professional Installation: 
    Both felt and GRP roofing require specialized skills, so it is best to hire experienced professionals to ensure correct installation and maximize the lifespan of the roof. 
     
  • Weather Conditions: 
    GRP roofing must be installed in dry weather, with an ambient temperature between 7°C and 30°C, for proper curing. 
     
  • Safety: 
    Torch-on felt roofing involves open flame and requires strict adherence to safety protocols. 

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