What are the options for a flat roof covering?

The main options for covering a flat roof are EPDM rubber, GRP fibreglass, felt, and TPO, each with different costs, lifespans, and installation methods. EPDM is widely considered the best all rounder for durability and value, while felt remains the cheapest upfront. We’ll go through each option, what’s cheapest, and how to make a flat roof look better once covered.

What’s the best cover for a flat roof

EPDM rubber is often considered the best overall choice for UK flat roofs, combining a long lifespan, often 30 to 50 years, with flexibility that handles temperature changes well. It’s installed as large sheets with minimal seams, reducing the risk of leaks at joints.
GRP fibreglass is another strong option, providing a tough, seamless finish that’s particularly good for roofs that will see foot traffic, like roof terraces. It costs more than EPDM generally but offers a very durable, glass smooth surface.

What is the cheapest way to cover a flat roof

Felt remains the cheapest option upfront, and modern high performance felt systems have improved significantly compared to older versions. However, felt typically has a shorter lifespan, often 10 to 20 years, meaning it may need replacing sooner than EPDM or GRP.
When comparing cheapest options, it’s worth thinking about cost over time rather than just the initial price. A slightly more expensive EPDM roof that lasts twice as long as felt can work out better value over the lifetime of the roof.

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What can I put on a flat roof to make it look better

If the roof is visible from windows or a garden, a layer of decorative stone ballast or paving can improve the look while also protecting the membrane underneath from UV exposure. This is common on EPDM roofs where a finished, tidy appearance matters.
For roofs designed for use as a terrace, decking can be laid on raised supports above the membrane, creating a usable outdoor space while protecting the waterproof layer below. Planters and green roof systems are also growing in popularity for adding visual interest.

What’s the best way to cover a flat roof

The best approach starts with an honest assessment of the existing roof structure, since the covering is only as good as what’s underneath. Rotten decking or inadequate falls need addressing before a new covering goes on, regardless of which material is chosen.
From there, EPDM is generally the most practical choice for most domestic flat roofs, offering a good balance of cost, durability, and relatively straightforward installation, though GRP suits roofs that need a hard wearing, walkable surface.

Comparing the main flat roof covering options

This gives a quick overview, but the right choice for your roof depends on size, use, and budget, which a roofer can talk through during a site visit.
It’s also worth considering how the roof will be used. A roof that’s purely functional, like over a garage, might suit a simpler felt or EPDM covering, while a roof intended as outdoor space needs a covering designed to be walked on.

Things that affect which covering suits your roof

The size and shape of the roof matters, EPDM works well on roofs of almost any size due to large sheet sizes with few joints, while felt is applied in smaller rolls with more seams, which can be a consideration on larger roofs.
Access and the condition of the existing structure also play a role. If scaffolding is already up for other work, it can make sense to combine a flat roof covering replacement at the same time to save on access costs.

There’s a good range of options for covering a flat roof, from budget felt to long lasting EPDM and tough GRP. The right choice depends on your budget, how the roof is used, and how long you want it to last, and a roofer can help match the covering to your specific roof.

Need some Flat Roofing support? Speak with a member of our professional flat roofing team here

Frequently Asked Questions

What are the options for a flat roof covering?

The main options are EPDM rubber, GRP fibreglass, felt, and TPO, each varying in cost, lifespan, and suitability for different roof types.

What’s the best cover for a flat roof?

EPDM rubber is often considered the best all-round option, offering a long lifespan and good performance with minimal seams.

What is the cheapest way to cover a flat roof?

Felt is generally the cheapest upfront option, though it has a shorter lifespan than EPDM, GRP, or TPO.

What can I put on a flat roof to make it look better?

Decorative stone ballast, decking, or planters can improve the appearance of a flat roof while also protecting the covering underneath.

What’s the best way to cover a flat roof?

Start by ensuring the roof structure is sound, then choose a covering like EPDM or GRP based on budget, size, and intended use.

How long does EPDM roofing last?

EPDM typically lasts 30 to 50 years when properly installed and maintained.

Is GRP fibreglass good for flat roofs?

Yes, GRP provides a tough, seamless, walkable surface, making it a popular choice for terraces and roofs that see foot traffic.

Can I walk on an EPDM roof?

Occasional light foot traffic is usually fine, but EPDM isn’t generally designed for regular walking compared to GRP.

Does a flat roof need a slight slope?

Yes, flat roofs need a minimum fall, usually around 1:80, to allow water to drain rather than pool on the surface.

How often should a flat roof be inspected?

An annual check, plus after major storms, helps catch any issues with the covering or drainage early.

Can felt roofs be repaired rather than replaced?

Yes, small areas of damaged felt can often be patched, though widespread issues usually point towards a full covering replacement.

What causes flat roofs to fail early?

Poor installation, inadequate falls leading to standing water, and UV degradation over time are common causes of early failure.

Is TPO a good choice for a flat roof?

TPO offers good UV resistance and a bright finish, and performs well, though it’s more commonly used on larger roofs.

Should I match my flat roof covering to my main roof style?

Not necessarily, flat roof coverings are functional and often not visible, so performance and lifespan usually matter more than matching the main roof.