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Flat Roofing in Horsham

Modern fibreglass, EPDM rubber, and felt flat roofing systems for extensions, garages, and commercial properties. Serving Horsham and the surrounding West Sussex area.

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Flat Roofing in Horsham

Modern flat roofing systems are far more durable and long-lasting than the old felt that gave flat roofs a bad reputation. West Sussex Roofing install and repair all leading flat roofing systems across West Sussex. Our preferred specification for most residential flat roofs is fibreglass GRP — a seamless, rigid surface built to resist UV, ponding water, foot traffic, and root intrusion. Where flexibility is required we install EPDM rubber membrane, the market-leading commercial flat roof system trusted on buildings worldwide. We also carry out like-for-like felt replacements for heritage properties and temporary structures. Every flat roof installation includes proper drainage design, correct fall configuration, and perimeter edge detailing to the highest waterproofing standard.

About Horsham

Horsham is a thriving market town with a mix of historic properties in the town centre and substantial residential development in the surrounding villages. We serve homeowners throughout Horsham, Southwater, Roffey, Broadbridge Heath, and the surrounding West Sussex villages. Rural West Sussex properties often feature natural Horsham stone roofs — a traditional local material that requires specialist knowledge to repair correctly. Our team has experience working with Horsham stone as well as all modern tile and slate specifications. Larger detached houses in the villages around Horsham also tend to have complex roofs with multiple pitches, dormers, and chimney stacks that benefit from our specialist expertise.

What's Included

  • Fibreglass GRP — seamless, long-lasting finish
  • EPDM rubber membrane for flexible applications
  • Correct drainage design and fall configuration included
  • Garage, extension, dormer, and commercial flat roofs
  • Full replacement or like-for-like repair options

Flat Roofing in Horsham — FAQs

How long will a new fibreglass flat roof last?
A properly installed fibreglass GRP roof is a long-lasting, low-maintenance option. Unlike felt, it is fully seamless so there are no joints to fail. Our fibreglass installations come with a written material and workmanship guarantee.
Can I add a rooftop terrace to my flat roof?
In many cases yes, but it requires assessment of the roof structure, planning permission advice, and an appropriate surface specification such as paving on pedestals over a protected membrane. We carry out all of this work and advise on the planning process.
My garage flat roof is bubbling — what does that mean?
Bubbling (blistering) in felt flat roofs indicates the felt has delaminated and moisture is trapped beneath. It is a sign the roof is nearing or past the end of its serviceable life and should be surveyed as soon as possible to prevent water ingress.

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