EPDM and GRP Flat Roofing | What Is the Difference?

EPDM and GRP Flat Roofing What Is the Difference

Building a new structure sounds fun until you find yourself in the dilemma of what type of roofing you want to have. The market is saturated with myriad roofing options that may confuse consumers. If you have visited the market or searched online, then you must have frequently come across words like “EPDM flat roofing” and “GRP flat roofing”.

Both of these roofing types are highly popular and can accommodate versatile weather conditions and roof structures. However, they both have their own pros and cons, which we have discussed in this blog. Read further to learn more about them.

EPDM Flat Roofing

EPDM is the abbreviation for Ethylene Propylene Diene Monomer. It is a synthetic rubber material that has immense durability. It has been used as one of the most reliable, strong, and affordable methods of roofing since the 1960s. It can be manually installed with fasteners, secured with stones, or glued. It works great for low-sloped roofs and comes in black and white colours.


  • It is budget-friendly.
  • It requires easy installation.
  • It is waterproof and impermeable.
  • It reduces the energy consumption.
  • It is an environment-friendly option.
  • It requires little and easy maintenance.
  • It is fire-resistant and can slow down the fire expansion.
  • It is sturdy and durable and can last up to 25-30 years if taken care of!
  • It is highly flexible to bend in different shapes and sizes.


  • It is prone to damage.
  • It can shrink up to 4% as it ages.
  • Non-reinforced EPDM forms can be punctured.
  • It is not as visually appealing as other types.
  • It is vulnerable if installed in unsuitable environment.
  • Ponding water may cause long-term damage to the roof.

GRP Flat Roofing

Glass Reinforced Plastic (GRP), more commonly known as fibreglass roofing, is an amalgam of polyester resins and chopped strand mat glass fibres. With more awareness regarding the benefits of GRP, its evolvement and increasing installation expertise, it is becoming one of the most widely preferred roofing options.


  • It is waterproof.
  • It is lightweight.
  • It is eco-friendly.
  • It has high curb appeal.
  • It has diverse applications.
  • It is a jointless roofing option.
  • It is available in different colours.
  • It requires easy repairs.
  • It is highly durable and can last more than 25 years!


  • It is expensive.
  • The colour fades with time.
  • It is not the best solution for larger roofs.
  • It needs to be installed under suitable weather conditions.

GRP Flat Roofing

EPDM vs GRP Flat Roofing

Here is a brief overview of the difference between EPDM and GRP flat roofing.

EPDM Flat Roofing GRP Flat Roofing
Cost (EPDM is better)
  • It is made of recyclable materials so it costs lesser.
  • It requires less labour and has relatively easy installation process which makes reduces the net expense of roof installation.


  • It is expensive as compared to EPDM.
  • Its installation is relatively more complex and requires specific weather conditions, tools and products that makes it harder and costlier.
Appearance (GRP is better)
  • It comes in black and white.
  • It is not aesthetically pleasing as it has a dull basic finish. However, since it’s not visible from the ground so this point is often overlooked.
  • It comes in a variety of colours.
  • It also gives a clean look
  • The different colour options make it more preferable.
Sustainability (Both are good)
  • It has very little smog impact.
  • It is made of recyclable material.
  • It is highly compatible with green roofs.
  • It doesn’t contain bitumen.
  • The rubber material doesn’t pollute the rainwater.
  • It is relatively less eco-friendly. However, it still is an eco-friendly option as it doesn’t emit any harmful toxins.
  • It does not require frequent replacements and hence produces less waste.
  • Its constituent components can be recycled.
Installation (EPDM is better)
  • It is relatively easy and quick to install.
  • It requires less installation cost.
  • Its installation takes longer as it requires a series of steps to ensure a proper installation.
  • It cannot be installed in wet conditions, so waiting for the right time can be a challenge.
  • It is not suitable for larger roofs and has high expansion rates.
Repair and Cleaning (EPDM is better)
  • It is highly durable and requires occasional maintenance.
  • It can be easily cleaned with a rubber roof cleaner or a mop.
  • It is sturdy. However, repairing it can be harder than EPDM.
  • It can be easily cleaned using simple tools like a mop and a gentle cleanser or pressure washer.
Durability (GRP is better)
  • It is known to have an average life span of 25-30 years, and if taken care of properly, it can even last up to 50 years!
  • It is not prone to cracks and blisters due to its elasticity.
  • It is not suitable for high traffic and can swiftly deteriorate.
  • With correct installation, it can last for more than 25 years.
  • It has an excellent strength-to-weight ratio, which means increased load-bearing capacity.
Weather Resistance (Both are good)
  • High water resistance; less leakage.
  • Resistance to salt water makes it best for structures in coastal areas.
  • It offers matchless UV resistance.
  • It is watertight and leakproof.
  • It offers a strong barrier against moisture.
  • It is resistant to UV. However, the colours may fade.

Every house has its own requirements, and it is always best to consult specialists to find the right roof for your project. It ensures peace of mind and a long-lived roof. If you are concerned about your roof selection and installation in Surrey, then connect to Surrey Roofing Specialists Ltd.

Surrey Roofing Specialists Ltd. is one of the most trusted names in the roofing industry in Surrey. From installation to repairs, our versatile services ensure to cover all aspects of roofing and gutters. So, if you need any guidance, maintenance, or a new roof, don’t hesitate to call us!

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