Which flat roof system is best? – Introduction

The flat roof is a great choice for many buildings for example an extension, garage or outhouse. The goal of this article is to help you understand the different types of flat roof systems that we supply and which one is better suited to your project. This will help you make an informed decision when choosing your flat roof, whether it’s a DIY project or hiring a professional roofer.

What are the types of flat roof coverings?

  • Rubber roofing: EPDM stands for Ethylene Propylene Diene Monomer, EPDM is an extremely durable synthetic rubber roofing membrane. 
  • Fibreglass roofing: This material consists mainly of glass fibre woven into a fabric that has been coated with resin to make it waterproof. It resists both fire and water damage well because the fibres themselves don’t absorb water like some other materials do (like asphalt shingles). 

Life expectancy and Longevity.

Very good for both products, 25 – 30 years for fibreglass and up to 50 years for rubber. Rubber is more susceptible to accidental sharps damage and vandalism however both are easily repairable for isolated minor damages.

Certification

Fibreglass – NHBC approved, Fire retardent

EPDM – BBA approved – NHBC approved – Fire rated

Cost

Fibreglass costs a little more than EPDM, both are more cost effective in the long term than Felt. Fibreglass is better suited for foot traffic elements such as balconies and elevated decks. However Rubber can be easily over paved using geotextile fleece and paving slab supports.

Suitability

Fibreglass

  • Green roofs
  • Lightweight
  • Visually attractive
  • Colour options
  • Strong
  • Jointless under 50 sq.m
  • Complex shape compatible
  • Large roofs require expansion joints
  • No hot flame required.

EPDM

  • Green roofs
  • Lightweight
  • Flexible
  • Strong
  • Complex shape requires joins
  • Suits uniformly shaped roofs
  • No hot flame required.
  • Visually standard

Damage resistance

Fibreglass has a very high resistance factor even to vandalism – EPDM is very durable but may have issues with sharps and vandalism.

Repair Profile

Both are very easily repaired, done well a fibreglass repair is almost invisible. Rubber repair has a higher visibility.

Appearance

Fibreglass is first class and easily cleaned and at RKD comes in Light and Dark Grey. Rubber is black, as you would expect and has a good clean appearance. Also rubber is easily cleaned

Both systems use edge trims to provide clean and professional looking finishes.

So let’s look at the pro’s and cons

Fibreglass

Pros

  • Visually
  • Complexity compatible
  • Foot traffic compatible
  • No joins
  • Resistant to sharps
  • Good repairability profile
  • Not hot flames required
  • Good Longevity
  • Small roofs good for DIY

Cons

  • More expensive than EPDM
  • Mandatory to be dry throughout installation
  • Mixing ratios to be considered
  • Large roofs require expansion joints

Rubber

Pros

  • Cost effective
  • Easy to install
  • One piece
  • Can be joined
  • Good repairability profile
  • Not hot flames required
  • Great longevity
  • Good for DIY

​​Cons

  • Complexity means joins
  • Requires additionals for foot traffic
  • Needs to be dry
  • Potential shrikage
  • Susceptible to sharps

In frankness it’s all in personal perception and the project you are envisaging.

Both systems have first class waterproofing qualities.

Here’s the good news!

RoofingKits.co.uk has got your back, whether you’re looking for a beautiful new fibreglass roof or are wanting to DIY a rubber roof. 

Check out our range online today, or get in touch for some friendly advice on which one is right for you.

If you’re still unsure or have any questions about which type of roof is right for your home then please get in touch with one of our experienced team members today! We’re always happy to answer any queries about fibreglass roofs and rubber roofs so feel free drop us an email or give us a call anytime 02381 229016.