For Flat, Curved & Sloping Roofs

For Flat, Curved
& Sloping Roofs

25 Year Guarantee

25 Year

Specialist Advice & Support

Specialist Advice
& Support

Express National Delivery

Express National

We've waterproofed 180m SqM of roofs!

We've waterproofed
180m SqM of roofs!

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a sample

EVA membranes - The choice for single-ply roofing

6th December 2022

What is an alwitra®/EVA membrane?

EVA waterproofing membranes are superior quality membranes best suited for single-ply waterproofing of all types of flat roof constructions.

What makes EVALON® membranes (the leading alwitra® product range) high-quality membrane is their consistency - a high polymer alloy of EVA and PVC. Both components are polymer solids, so the physical properties remain intact over time, leading to optimal life expectancy. They are fully compatible with bitumen and most types of insulation boards, which cannot be said for some competing membranes on the market. EVA membranes are free from potentially harmful volatile plasticisers - largely responsible for their longer life expectancy, as opposed to other single-ply membranes that are vulnerable to plasticiser loss. Their excellent chemical resistance provides a reliable protective membrane against the weather so that buildings can stay up for decades.

What are some of the advantages?

  • Quick and easy to install
  • Available in a range of colours
  • Bitumen compatible
  • Suitable for all flat roof configurations
  • Have a smooth surface which does not retain dirt

How do they compare to other single-ply membranes?

PVCp - Polyvinylchloride Plasticised

  • Not bitumen compatible and cross-contamination with other PVC materials can lead to plasticiser loss
  • Micro-organisms in the atmosphere can consume the membrane which draws plasticisers out of the material

EPDM - Ethylene Propylene Diene Monomer

  • Choices of colour are only limited to black
  • Lap seals are difficult to form, relying on glue
  • A thick material making detailing complex around pipes, upstands, or where there is a change of plane

FPO & TPO - Flexible Polyolefin / Thermoplastic Polyolefin

  • When weather temperatures are low, the flexibility becomes very stiff which makes it difficult to install
  • The cost is high in comparison to alternatives
  • Welding is best suited in a controlled environment such as factories, but with fluctuating weather, they are harder to install and require the usage of digital heat guns. Welds must be correct FIRST TIME with no room for correction

Want to become an alwitra® accredited installer?

  • High-quality training
  • Become accredited
  • Receive new business leads from alwitra®

Apply Today

Our membranes are used by architects, contractors & developers. View all

Archdiocese of Liverpool
Coventry City Council
3D Reid
Balfour Beatty
InFrame Garden Rooms
Fife Council
Angell Thompson
Alec French Architects
Aloft Roofing & Leadwork
English Heritage
Glasgow Housing Association
Coomber Associates
Ashtree Roofing

Need expert advice or just have a question?

Our specialists are here to support you.
Just ask.

Contact Us 01202 785200

Here's what some of our clients have to say...

We have been alwitra® contractors for many years and have always been impressed with the results and reliability of the product. The customers…

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I, James Hopkins Director of JH Specialist Roofing install single-ply membranes on a daily basis, we as a company have tried numerous types of…

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We have used VSK extensively over the last 5 years, we have found it to be a great product and really good for complex detail work. We find using…

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As a small flat roofing business carrying out mostly domestic refurb work and small extensions EVALON® VSK is our preferred single ply membrane…

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We have been an approved contractor for many years, the level of customer service and the quality of the products provided by ICB (Waterproofing) is…

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We have worked with ICB on several occasions and we would thoroughly recommend them for their high level of professionalism and efficiency. The team…

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OB Architecture

ICB provides an excellent service with all the professional back-up required at the development stage through to completion. The manner in which you…

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I am pleased to recommend ICB as Company, through my personal experience and that of my Business, for the following reasons: They are an easy Company…

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We believe, as one of your approved contractors, over the years we have had a great working relationship with yourselves. When working on projects…

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Best system on the market – VSK all the way!!!!!!


alwitra® is a lovely membrane when you have some detailing and gutters as you can go all the way through in a oner…


…that’s the beauty of this membrane, (you) can complete field sheet and upstand in one go, nice and tight and (a) crisp finish in the…

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This product has to be the most versatile single-ply system we have used. Unbeatable finish.

Lee Orchard

EVALON® VSK – such a quality and versatile membrane.

Lee Orchard

In my mind the best single-ply.


Can’t beat VSK


We find all the staff at ICB, friendly, helpful & knowledgeable.


EVALON® VSK! Surely the best single-ply waterproofing membrane ever produced! A++++


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