GRP Laminating Specialists

We’re a roofing company based in the south east of England, our services include high quality liquid waterproofing for roof replacements & repairs.

What is GRP?

Glass reinforced plastic (GRP), also known as fibreglass, is a composite material made from a plastic polymer reinforced with glass fibres. The fibreglass is saturated in a polyester resin, which fully hardens once mixed with a catalyst.

Due to the omnidirectional fibres and thickness of the matting, it provides high strength across all areas, yet being very lightweight.

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white glass fiber composite hand lay up raw material background

Roofing Systems

GRP Misconceptions

Felt & EPDM Rubber Flaws

Felt and EPDM rubber system are often used for flat roofs due to the quick installation time and competitive pricing. However these do not offer the same durability and longevity as a fibreglass roof. Joins and seams lose their adhesive strength over time and can be further damaged by environmental factors.

Fibreglass Roofing Misconceptions

In recent years GRP roofs have gained popularity due to the promotion of the system in merchants. Often Builders will attempt to install a fibreglass roof with limited experience or knowledge, which results in the product getting a 'bad reputation'.

Common mixtakes include:

Laminating on while raining, wet, or snowing
Pinholes caused by insufficient coating of the matting
Incorrect boarding e.g. plywood
Not using expansion joints

Smartseal Flat Roofing Ltd

5.0

Based on 7 reviews

review us on

nick kirkpatrick

21:35 01 Nov 25

Outstanding service. Darren & Brad are experts and their attention to detail is unrivalled. I would highly recommend

Val Phillips

17:39 12 Mar 25

Darren and Bradley did a brilliant job on our very leaky roof. Would not hesitate to recommend them! Many thanks.

Tony Voller

08:03 25 Apr 24

I wouldn’t think twice about recommending Darren and his team
The workmanship and attention to detail is second to none
Thanks guys

Jane Ferguson

10:36 24 Mar 24

Very happy to have found Darren and Bradley who saved us from a leaking flat roof. Darren was very responsive and helpful through the quote process as our job was not straightforward. He helped organise scaffolding and Bradley did a brilliant job on the roof. Photos provided throughout to show us progress. 15 year guarantee. Definitely recommend them.

Des Peacock

07:12 24 Mar 24

Darren and his crew came to my rescue after the last storm at the end of January 2024. Upon assessing the damage Darren organised scaffolding fitted the same day and covered the damaged flat roof! The end result looks amazing a fantastic product! I cannot praise this company high enough they were professional from start to finish a great company to deal with. Without a doubt I would highly recommend them.

Bodrul Uddin

12:00 01 Oct 21

Daren provided me with an excellent service after our builder left us with a leaking roof. They worked tirelessly to fix our roof and we are truly grateful. A really nice individual and I would happily use Darren and his team again!

Parish Office

07:49 20 Apr 18

Smartseal installed a GRP roof on our kitchen extemsion over 7 years ago. The roof is sound and trouble free and still looks fantastic. I have no hesitation in recommending this company and often see the vans around in the Oxted area.

GRP Flat Roofs

Our GRP flat roof system includes a base-resin, fibreglass chopped-strand matting and a pigmented resin for the topcoat. These roofs are boarded with 18mm t&g OSB3 sterling boards, and are laid with either 450g per m² matting (standard), 600g for heavy foot traffic, and 900g for green roofs.

Advantages of Glass reinforced polyester:

No joins or seams
No splits or cracking
25-year guarantee
Smooth finish (optional non-slip)
Low maintenance
Choice of colours

GRP Overlays (Felt, Asphalt & EDPM Rubber)

For felt, asphalt, fibreglass and epdm rubber roofs, we offer a flexible polyester resin overlay product such as Restec 2020. This product has various primers, which adheres to the existing surface, before the application of the resin. Unlike replacing the entire decking, which results in a smoother finish, overlays take the shape of the existing material.

Benefits of Overlays:

Cost effective (no removal of existing material)
More flexible than standard resin
2-coat application
20-30 year guarantee

Our GRP pond lining service offers a fully waterproof system, which adheres to new pond, pools, wet room tanking, and fountains. We also refurbish old lining, with the option of choosing from a wide range of colours.

Fibreglass lining consists of a 3 part process. A primer is used on all areas which require waterproofing, followed by the polyester resin and chopped-strand matting. After the waterproofing is complete, the entire area is sanded, then painted with a a pigmented resin.

Benefits of fibreglass pond lining:

No seams or joins
Easy to clean
No effect on marine life
Sustainable materials