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!

Request a sample

Request
a sample

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®

Soil Vent Pipes

The alwitra Shaft (Soil) Vent Pipe forms the upper end of vent pipes protruding over low slope roofs. The soil vent pipe consisting of one single pipe extends over the roof build-up without any joints and is connected to the downpipe.e below the roof structure by means of the included reducer.

Worldwide

As used on landmark architecture throughout the world

almost 40 years experience with waterproofing systems in the UK

Almost 40 years experience with waterproofing systems in the UK

Find an installer

Advantages

  • The connecting flange can be welded dirtectly to the corresponding roof waterproofing without any auxiliary materials.
  • At the top, the soil vent pipe can be left open. Alternatively, the soil vent pipe can be covered against rain with the included vent cowl or with the optional weather cap
  • The lower part made of PP and PP bead foam is installed in the supporting substructure and flashed against the vapour and wind barrier; inserting into the vent pipe ensures air-tightness

Applications

  • Suitable for both warm and cold roofs

Product Details Back to top

Product Specification

Material: PVC pipe with vent cowl and optional weather cap made of PP
Colour: black, with factory-fitted connecting flange in the colour of the waterproofing membrane
Height above the waterproofing (excl. cowl): 300 mm
Outer pipe diameter: 125 mm (DN 125)
Outer connecting flange diameter: 480 mm
Outer support ring diameter: 240 mm
Ø of screw holes at support ring: 210 mm
Flange width support ring: 60 mm
Installation opening: Ø 190 (200) mm
Thermal insulation thickness: 0 - 300 mm (or 800 mm for SL)
Connection diameter: 125 mm (DN 125) and 110 mm (DN 100), 75 mm (DN 70) optional

Technical Drawings

Soil Vent Pipes

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
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

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 More

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…

Read More

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…

Read More

Dave

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

Read More

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…

Read More

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…

Read More

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 More

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…

Read More

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…

Read More

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…

Read More

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

Find an Installer

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

Find an installer
Close

We use cookies

If you continue without changing your settings we'll assume you're happy to receive our cookies.
If you'd like to change this just update your browser settings. Find out more.

Okay. I got it.
Full screen