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!

Request a sample

a sample

Single-Ply Membranes

Our Single Ply Membranes set the UK gold standard for waterproofing all roof types, including flat, curved, sloped, mansard, and dormers. alwitra® products surpass all competitors in reliability, offering a superior single ply solution for flat roof waterproofing compatible with green, brown, or blue roof systems.




Superior Single-Ply Waterproofing

Superior single ply waterproofing at its best.

  • Bitumen-free & solvent-free
  • UV Stable
  • Root-resistant
  • Fire load five times lower than that of a built-up felt roof
Discover More


Self-Adhesive Single Ply Membrane

The #1 self-adhesive waterproofing membrane

  • Self-adhesive underside coating
  • Bitumen-free & solvent-free
  • High adhesive strength
  • Ideal for steep slope or curved roof areas
Discover More


Superior Fire-Retarding Waterproofing

Superior Fire-Retarding Waterproofing

  • Compatible with bitumen
  • High thermal-mechanical resilience
  • Root and rhizome-resistant
  • High reflection of heat rays
Discover More


Superior Fire-Retarding Self-Adhered Waterproofing

  • Up to five times lower fire load compared to two-layer seals
  • Optimal vapour pressure compensation function of the polyester fleece or glass/polyester fleece backing
  • Self-adhesive underside coating
  • With the integrated fire protection layer, for direct bonding on unbacked rigid EPS foam boards
Discover More

What is a Single Ply Membrane?

Single ply membranes are flexible synthetic polymer waterproofing sheets specifically designed to waterproof flat roofs. This type of roofing can be categorised into two groups: thermoplastics and synthetic rubber, offering a modern solution for flat roof applications.

What is the best Single Ply Membrane?

The best Single Ply Membrane is a vinyl-ethylene-terpolymer (VET) membrane, comprising polyvinyl-chloride (PVC) and ethylene-vinyl-acetate (EVA), which results in an extremely stable product, free from potentially harmful volatile plasticisers. With excellent chemical resistance. It provides a reliable protective membrane against inclement weather to ensure buildings remain protected for years to come.

alwitra® are the leading supplier of Single Ply Membranes with a 50-year service life and a 25-year guarantee, they are as reliable as they are cost-effective. Easy to install, and available in various colours to replicate traditional roofing at a lower cost, these BREEAM Accredited, UV stable, root-resistant membranes are bitumen-free, solvent-free and applied cold. Most importantly, they are trusted by architects, roofing contractors and developers throughout the world.

System Components

Aluminium Profiles

Aluminium Profiles

High-quality aluminium profiles for roof edging and roof capping.

Discover more
Daylight Systems

Daylight Systems

Superior daylight systems providing light and excellent thermal insulation.

Discover more
Roof Drainage

Roof Drainage

The perfect solution to various drainage issues for low sloped roofs.

Discover more


Additional extras to customise your alwitra® waterproofing system.

Discover more

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…

Read Full Review


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…

Read Full Review


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…

Read Full Review


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

Read Full Review


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…

Read Full Review


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

Read Full Review

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…

Read Full Review


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…

Read Full Review


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

Read Full Review


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…

Read Full Review


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++++


Find an Installer

We're ready to help, just fill out this form and we’ll get straight back to you.

Find an installer

We use cookies. By using the website you agree with our use of cookies. For more information, please read our privacy policy.

Okay, got it!
Full screen