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

Flat Roof Vents

Flat Roof Vents

Cold Roof Vents

Cold Roof Vents

alwitra cold roof vents can be welded directly to the corresponding roof waterproofing without any additional materials.

  • The vent cowl, together with the weather cap, provides rainproof protection of the vent pipe
  • At the lower end of the vent, a drip pan will collect any condensate, which will eventually evaporate. This is to prevent or reduce moisture penetration of the thermal insulation
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Refurbishment Vents

Refurbishment Vents

The alwitra refurbishment vent 160 is made of CFC free PUR integral foam.

  • At the factory, an EVALON® sealing ring is foamed into the welding flange. The sealing ring ensures permanently reliable flashing against the new roof waterproofing.
  • To this end, a prefabricated EVALON®  flashing collar is homogeneously welded to the sealing ring and the adjacent roofing membrane in the same way as the seam connection of the field membranes.
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Soil Vent Pipes

Soil Vent Pipes

The alwitra soil vent pipe forms the upper end of vent pipes protruding over low slope roofs with waterproofing of any constructional type up to DN 125 (OD 125).

  • The soil vent pipe consisting of one single pipe extends over the roof build-up without any joints and is connected to the downpipe DN 125 (OD 125) and DN 100 (OD 110) below the roof structure by means of the included reducer.
  • A corresponding reducer (125/75) is available for downpipes DN 70 (OD 75)
  • The connecting flange can be made with EVALON®
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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
Aloft Roofing & Leadwork
Fife Council
Angell Thompson
Alec French Architects
Ashtree Roofing
English Heritage
Glasgow Housing Association
Coomber Associates
Bay Roofing SW Ltd

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!!!!!!


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


alwitra® Evalon VSK! Surely the best membrane ever invented.


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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