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


alwitra Dayluxe Window

alwitra® Dayluxe Window

High-performance multi-cell frame with a laminated safety glass pane (HR++). 

  • In combination with an alwitra® kerb and an alwitra® rooflight, you get a flat roof window, absolutely suitable for living spaces, with optimum characteristics.
  • Compatible with all alwitra® rooflights and kerbs


Discover More
Double-shell rooflight 2S

Double-shell rooflight 2S

 The double-skin version consists of two domed extruded polymethyl methacrylate skins (PMMA).

  • Acrylic glass rooflight 2S (U value: 2.68 [W/m²K])
  • Highly transparent, impact-proof and UV resistant plastic. 
  • The standard version consists of two opaque skins; a version with two transparent skins is available on request.
Discover More
Three-shell rooflight 3S

Three-shell rooflight 3S

Acrylic glass rooflight 3S (U value: 1.70 [W/m²K])

  • Consists of three domed extruded polymethyl methacrylate skins (PMMA).
  • The standard version consists of two opaque skins and a transparent middle skin; a version with three transparent skins is available on request.
Discover More
Multi-Shell Rooflight 2S WD

Multi-Shell Rooflight 2S WD

Acrylic glass rooflight 2S WD. 

  • The multi-skin rooflight 2S WD consists of a transparent domed outer acrylic glass skin (PMMA)
  • 10 mm domed transparent SPC sheet and an opaque inner acrylic glass skin
  • Due to their outstanding thermal insulation characteristics, these rooflights are the ideal solution for buildings with increased thermal protection requirements.
Discover More


The extruded polyvinyl chloride profiles with an impact-proof frame feature an innovative cellular system optimising the thermal insulation of the profile.

  • Without any additional measures, alwitra® upstands ensure excellent thermal insulation up to every corner
  • U-value: 1.0 W/m²K according to EN 12567-2
  • White inner side, smooth or lightly textured PVC
Discover More
Rooflight Accessories

Rooflight Accessories

  • Electrical sun protection
  • alwitra® fall-through protection grating
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