# HYDRONYLON

> HYDRONYLON® is a liquid-applied flat roof waterproofing system, assessed under European Technical Assessment ETA-23/0735. It is supplied and supported in the United Kingdom by HYDRONYLON LTD, a British company registered in England and Wales (Company No. 15582277), serving London and the wider UK.

HYDRONYLON LTD operates two lines of business: the supply of HYDRONYLON system products, and the HYDRONYLON Approved Contractor (HAC) programme, which trains and accredits professional installers. The system is cold-applied over an existing flat roof, sealing it into one continuous, seamless surface without a strip-off, and suits worn felt, asphalt, single-ply and metal roofs. A roof sealed by an Approved Contractor carries a 10-year product guarantee on the materials, issued to the contractor who carries out the work.

In London, HYDRONYLON Approved Contractors carry out flat roof waterproofing, flat roof leak repair, flat roof refurbishment and garage roof waterproofing.

## Services in London
- [Asphalt flat roof overlay London](https://hydronylon.uk/asphalt-flat-roof-overlay-london/): Overlay a worn asphalt flat roof in London instead of stripping it off.
- [Flat Roof Leak Repair in London](https://hydronylon.uk/flat-roof-leak-repair-london/): Leaking flat roof in London? HYDRONYLON is a seamless, liquid-applied waterproofing system fitted over your existing roof, with a 10-year guarantee.
- [Flat roof refurbishment London](https://hydronylon.uk/flat-roof-refurbishment-london/): Refurbish a worn flat roof in London instead of replacing it.
- [Garage roof waterproofing London](https://hydronylon.uk/garage-roof-waterproofing-london/): Leaking or worn garage roof in London? A liquid-applied system seals your existing garage roof without strip-off, with a 10-year product guarantee.
- [Liquid Roofing London](https://hydronylon.uk/liquid-roofing-london/): Liquid roofing for flat roofs in London.

## The system
- [How the HYDRONYLON system works](https://hydronylon.uk/system/): the cold-applied, liquid-applied method, step by step.
- [Applications and roof types](https://hydronylon.uk/applications/): the build-up for felt, asphalt, single-ply and metal flat roofs.
- [Cool roof](https://hydronylon.uk/cool-roof/): the solar-reflective, light-coloured finish and its benefits.
- [The 10-year guarantee](https://hydronylon.uk/guarantee/): how the product guarantee works through Approved Contractors.
- [Downloads](https://hydronylon.uk/downloads/): technical data sheets, the ETA, declaration of performance and brochures.

## Products
- [HYDRONYLON HP](https://hydronylon.uk/products/hydronylon-hp/): Base layers of the system on felt substrates, reinforced with Technical Mesh SW-1 and always finished with HYDRONYLON HN.
- [HYDRONYLON HN](https://hydronylon.uk/products/hydronylon-hn/): The top coat of the system, forming the final weathering surface on felt, metal, mineral and PVC membrane substrates.
- [HYDRONYLON HMS(P)](https://hydronylon.uk/products/hydronylon-hms-p/): Primer and base layer of the system on metal substrates, applied before the HYDRONYLON HN top coat.
- [Primer Emulsion EG](https://hydronylon.uk/products/primer-emulsion-eg/): Primer for mineral substrates, securing adhesion of the system before the HYDRONYLON HN top coat.
- [Technical Mesh SW-1](https://hydronylon.uk/products/technical-mesh-sw-1/): Reinforcement mesh embedded into the liquid layers of the system on felt and PVC membrane build-ups.
- [All products](https://hydronylon.uk/products/)

## Approved Contractor programme
- [Become an Approved Contractor](https://hydronylon.uk/become-a-contractor/): training, accreditation and how the HAC programme works.
- [Find an Approved Contractor](https://hydronylon.uk/approved-contractors/): the directory of accredited installers.

## Knowledge
- [Felt roof repair: your options when the felt is failing](https://hydronylon.uk/knowledge/felt-roof-repair/): Leaking or cracked felt roof? When a patch repair works, when it stops making sense, and how a liquid overlay renews a felt roof without stripping it.
- [Flat roof maintenance: how to extend the life of a flat roof](https://hydronylon.uk/knowledge/flat-roof-maintenance/): What to check on a flat roof and how often, plus how a worn but sound covering can be resealed rather than replaced to add years to its life.
- [Flat roof repair or replacement: which makes sense?](https://hydronylon.uk/knowledge/flat-roof-repair-or-replacement/): Repair, replace or refurbish? How to decide what a failing flat roof actually needs, what each route involves, and when an overlay saves the cost of a re-roof.
- [How long does a flat roof last?](https://hydronylon.uk/knowledge/how-long-does-a-flat-roof-last/): Typical flat roof lifespans in the UK by covering type, what shortens them, and what "assessed durability" really means when you compare systems.
- [How much does flat roof refurbishment cost?](https://hydronylon.uk/knowledge/flat-roof-refurbishment-cost/): Flat roof refurbishment in the UK usually costs less than full replacement because there's no strip-off.
- [Ponding water on a flat roof: how serious is it?](https://hydronylon.uk/knowledge/ponding-water-flat-roof/): Standing water on a flat roof: when it is normal, when it kills the covering, what it costs you in roof life, and how to deal with it properly.
- [What is liquid roof waterproofing?](https://hydronylon.uk/knowledge/what-is-liquid-roof-waterproofing/)

## Case studies
- [Leaking felt roof sealed in Shepherd's Bush, London W12](https://hydronylon.uk/case-studies/shepherds-bush-w12-felt-roof/)
- [Leaking lead and parapet roof sealed in Whitechapel, London E1](https://hydronylon.uk/case-studies/whitechapel-e1-lead-parapet/)

## About
- [About HYDRONYLON LTD](https://hydronylon.uk/about/): the company, the system and how it is supplied in the UK.
- [Contact](https://hydronylon.uk/contact/): how to get in touch.

## Optional
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