For Flat, Curved & Sloping Roofs

For Flat, Curved
& Sloping Roofs

25 Year Guarantee

25 Year
Guarantee

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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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alwitra Rainwater Outlet Horizontal
alwitra Rainwater Outlet Horizontal

Horizontal, rigid polyurethane body with EVALON flange, 125mm, complete with screw ring and flat grating

  • Made of highly impact-resistant polypropylene (PP) 
  • On classic warm roofs, all standard vapour barriers can be flashed directly.
  • Corresponding extension pieces are available in various lengths, depending on the thermal insulation thickness

alwitra Rainwater Outlet Horizontal

The thermally insulated alwitra rainwater outlet W (horizontal) ensures reliable connection between the waterproofing at cold or inverted roofs and horizontally installed drainage pipes.

Advantages

  • W 125 for connecting to drainage pipes with socket DN 125 (OD 125 mm)
  • W 75/110 with small overall height for connecting to drainage pipes with socket DN 70 (OD 75 mm) and - with included eccentric adapter 75/110 - to pipes DN 100 (OD 110 mm)
  • A combined leaf guard / gravel stop is included.

Applications

  • Cold and Warm Roofs

Product Details Back to top

Technical Drawings

alwitra Rainwater Outlet Horizontal

Technical Data

Class (leaf guard / gravel stop): H 1.5
Discharge: Horizontal
Material: Highly impact resistant PP
Colour: Black (optional connecting
flange in the colour of the waterproofing membrane)
Required roof opening: W 125 190 x 280 mm
W 75/110 190 x 250 mm
Min. Installation height: W 125 approx. 200 mm
W 75/110 approx. 110 mm
Outer diameter flange: 290 mm
Number of screw holes in flange: 3
Ø of screw holes in flange: 240 mm
Flange width: Approx. 50 mm
Connection diameter: W 125 125 mm (DN 125)
W 75/110 75 mm (DN 70)
110 mm (DN 100) with
included adapter 75/110
Outer diameter of optional connecting flange: 480 mm

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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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