Flat Roofing Explained: Choosing the Right System for Your Project

Flat Roofing Explained: Choosing the Right System for Your Project

Flat roofing has become a popular choice for modern homes and commercial buildings alike, offering a sleek finish and practical benefits like easier installation and accessibility. But with several flat roofing systems available, how do you choose the one that suits your needs best?

Let’s break down four of the most widely used options: GRP, EPDM, PU liquid systems, and torch-on felt.

1. GRP (Glass Reinforced Plastic) Roofing

Also known as fibreglass roofing, GRP offers a seamless, hard-wearing surface ideal for residential and commercial flat roofs.

  • Totally waterproof with no seams or joints

  • Long-lasting (typically 20–30 years)

  • Low maintenance and attractive finish

  • Best for; home extensions, garages, balconies

2. EPDM Rubber Roofing

EPDM (ethylene propylene diene monomer) is a synthetic rubber membrane known for its flexibility and strength.

  • Weatherproof and UV-resistant

  • Cost-effective and quick to install

  • Long lifespan (over 25 years) 

  • Best for; large, simple roof areas like outbuildings and warehouses

3. PU Liquid Roofing Systems

Polyurethane (PU) liquid roofing systems provide excellent coverage, especially for complex or irregular roof shapes. 

  • Fully bonded and seamless

  • Ideal for overlaying existing roofs

  • Durable with high resistance to standing water

  • Best for; Complex detailing, refurbishments, and small commercial units

4. Torch-On Felt Roofing

A traditional yet trusted method, torch-on felt involves layers of bitumen felt melted with a blowtorch to form a solid, weatherproof surface. 

  • Cost-effective and durable

  • Good impact resistance

  • Suitable for DIY with the right knowledge 

  • Best for; Sheds, garages, and budget-conscious flat roofing

Which Flat Roofing Option is Right for You?

When choosing a flat roofing system, consider your budget, roof size, exposure to weather, and long-term maintenance goals. For modern durability and performance, EPDM and GRP are excellent choices. If you’re dealing with tight budgets or simpler structures, torch-on felt may be the way to go. And for roof refurbishments or irregular shapes, PU liquid systems provide flexibility and seamless protection.

At Henshaws Roofing & Building, we supply high-quality flat roofing materials suitable for all project types—whether you're a seasoned contractor or taking on a DIY challenge.