For Flat, Curved & Sloping Roofs

For Flat, Curved
& Sloping Roofs

25 Year Guarantee

25 Year
Guarantee

Specialist Advice & Support

Specialist Advice
& Support

Express National Delivery

Express National
Delivery

We've waterproofed 180m SqM of roofs!

We've waterproofed
180m SqM of roofs!

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a sample

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.

Double-shell rooflight 2S

High quality rooflights for flat roofs 

The double-shell version (U value: 2.68 [W/m²K]) consists of two domed extruded polymethyl methacrylate shells (PMMA). Acrylic glass is a highly transparent, impact-proof and UV resistant plastic. The standard version consists of two opal shells; a version with two transparent shells is available on request.

Advantages

  • Outstanding thermal insulation characteristics
  • Natural lighting combined with preventive fire protection
  • System-compatible connection to alwitra waterproofing membranes by means of kerbs with optional EVALON® or EVALASTIC® collars

Applications

  • A great way to let natural light into a room
  • Suitable for room ventilation, as a natural smoke vent with geometric cross-section or for providing access to the roof.

Product Details Back to top

Technical Data

Material Build-Up

U Value
[W/m²K]

Light
transmittance [%]
g value Rw value
[dB]
Acrylic
(PMMA)
2S clear 2.68 81% 0.75 20
2s opaque 2.68 69% 0.58 20
Polycarbonate
(PC)
2S clear 2.68 79% 0.75 20
2s opaque 2.68 73% 0.63 20
Polycarbonate
Heatstop
2s opaque 2.68 41% 0.45 20
2SWD PMMA opaque 1.23 51% 0.42 21
2SWD PC opaque 1.23 50% 0.41 21

Reaction to fire PMMA: Euroclass E
Reaction to fire PC: Euroclass B-s1, do
CE marking DIN EN 1873

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

Archdiocese of Liverpool
Coventry City Council
Aecom
3D Reid
Balfour Beatty
Aloft Roofing & Leadwork
Churchill
Fife Council
Angell Thompson
Alec French Architects
ISG
Ashtree Roofing
English Heritage
Glasgow Housing Association
Coomber Associates
Arc
Jade-Aden
Bay Roofing SW Ltd

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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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Michael

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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James

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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Dave

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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Charlie

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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Carlo

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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Dave

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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John

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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Martin

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

Richard

…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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Shaun

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

Dave

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

Justin

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.

Peter

Can’t beat VSK

Lee

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

Steve

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

Kevin

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