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

Refurbishment Outlets
Refurbishment Outlets

The two-part system consisting of a custom-fit refurbishment plate.

  • The plate is centrically arranged over the existing rainwater outlet and flashed against the existing waterproofing without backflow.
  • The drainage element itself is then simply inserted into the refurbishment plate.
  • Flashing against the new waterproofing is carried out either with connecting flange and screw ring (refurbishment rainwater outlet 125) or with factory fitted connecting flange (refurbishment rainwater outlet 75, 110).

Refurbishment Outlets

In the case of refurbishment with additional thermal insulation, where it is not possible to replace existing outlets, it is recommended to install alwitra® refurbishment rainwater outlets.

almost 40 years experience with waterproofing systems in the UK

Almost 40 years experience with waterproofing systems in the UK


As used on landmark architecture throughout the world

Find an installer


  • Refurbishment projects with the additional thermal insullation 

Product Details Back to top

Product Specification

Technical data for alwitra® refurbishment rainwater Outlet 125

For existing rainwater outlets:

DN 125 - DN 150
Material: highly impact resistant PP
Min. thickness of additional insulation: approx. 50 mm
Max. thickness of additional insulation: approx. 200 mm
Outer diameter of flange: 290 mm
Flange width: approx.50 mm
Diameter of the drainage element: approx. 120 mm
Outer diameter of connecting flange: 480 mm
Refurbishment plate: PP black

Technical Data for alwitra® refurbishment rainwater outlet 75 and 110

For existing rainwater outlets:

DN 100 (outlet 110)

DN 70 - DN 90 (outlet 75)

Material: PVC
Min. thickness of additional insulation: approx. 10 mm
Max. thickness of additional insulation: approx. 300 mm
Connecting flange: factory-fitted, in the colour of
the waterproofing membrane
75: 180 x 180 mm
110: 230 x 230 mm
Refurbishment plate: Aluminium 

Technical Drawings

Refurbishment Outlets

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