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US Fiberglass and Gelcoat

Professional Marine Repair and Refinishing

About Fiberglass Flat Roofing

History of Fiberglass:

The development of fiberglass in 1935 lead to a revolution in strong, lightweight composites. Plastics produced in the early 1900’s lacked structural integrity; however, when combined with a fiberglass matrix, a superior composite was produced. The industry embraced this advancement in technology. Today products ranging from cars, ladders, wind turbine blades, and building construction materials depend greatly on fiberglass composites.

It can be walked on. Multiple color and texture choice.
Fiberglass roofs have been available in Maryland for over 25 years.

Besides the amazing longevity of fiberglass flat roofs, we have examples of roofs in Maryland’s extreme hot and cold temperature ranges remaining completely intact and leak free for over 25 years! Other advantages fiberglass provides include being lightweight, impact resistant, chemical/fire resistant, and very good as a thermal and electrical insulator. Your roof becomes a stronger and more versatile waterproof structure that will protect your investment for decades to come.

What is a GRP Roof?

A GRP roof is a single-ply GRP laminate applied in situ
over a good quality OSB3 deck. The roof is finished with
pre-formed GRP edge trims and a coat of pigmented

GRP has been used as a waterproofing material for over
fifty years for applications as diverse as boats, water
tanks, car bodies, roof lights, ponds and
pools. When used to construct a boat, GRP will provide
waterproofing protection for the boat’s entire lifespan
of twenty plus years without the need for maintenance
or replacement. This same level of performance is easily
replicated on a domestic roof.

Long Life

A survey of GRP buildings by the BRE (Building Research Establishment)
found the condition of several GRP buildings around 25 to 30
years old to be structurally sound. “A modular GRP stores building was
constructed to demonstrate the suitability of this material for construction purposes.
When examined 28 years later it was found to be mechanically sound. The BRE noted that today’s
materials would undoubtedly have a much improved service life.”

Cost Effective

When GRP is considered for large scale projects in comparison to traditional
bituminous roofing materials, it doesn’t compete on cost but its lifespan will
always be many times greater. GRP is frequently specified by local authorities
for large scale jobs as a cost-effective and permanent solution.

Environmentally Friendly

GRP has an incredibly good environmental profile; much less energy is used to
produce it compared to many other roofing materials. A GRP roof is completely
cold applied and does not require ‘hot works’ such as burners or torches. GRP
roofs do not give off substances that can harm the environment or create any
other toxic by-products. The long life span of GRP out-performs virtually any
other roofing system and this eliminates the environmental cost of producing
and installing replacement roofing systems in the future.

Maintenance Free and Fully Bonded

When a GRP roof is installed, the system is mechanically
bonded to the decking. It is impossible to remove it without
also removing the surface from the boards.

Why break with Tradition?

In a comparison between traditional roofing systems and GRP
there is only one clear choice.
Traditional bitumen-based roofing systems
rely on building up several layers of materials
to waterproof the roof. Each layer usually
represents five years of waterproofing and as
the layers break down and become ineffective
the roof will eventually leak. A GRP roof will
outperform virtually any other traditional or modern roofing
material and has the potential to outlast the structure it is

One of the features of GRP which sets it apart from nearly any
other roofing system is that it is a monolithic laminate. This
means that it doesn’t suffer the problems inherent in systems
that have seams, joints or welds, which are usually the weakest
point of any roof. Obstacles or features can either be weatherproofed or
incorporated into the substrate with ease on any size of roof
and in any colour. GRP roofing is also cold applied which avoids
the risks and environmental costs associated with hot works.

How long will a GRP roof last?

We do not know! A well-laid GRP roof installed with the
correctly formulated resins has the potential to last as long as
the structure it is protecting. Many of the first GRP roofs laid
more than 35 years ago are still in service today!

Aerial photography done by: Hunter H. Harris: www.flyaloft.com

Benefits of fiberglass flat roof over all other traditional flat roof material are:

  • Virtually seamless, the entire roof, parapet wall and coping become 1 piece.
  • Will not leak from ponding or being under water indefinitely.
  • Impact resistant.
  • Chemical resistant.
  • Light colors provide energy efficiency.
  • Can be walked on without damage.
  • Fire resistant.
  • Great insulator, non conductive.
  • Available in any color.
  • Lifetime warranty.

Our services include:

  • Flat Roof Repair
  • New build Flat Roofs
  • Leaking Roof Repair
  • Balconies and Walkways