HYDRONYLON HP
The principal liquid-applied waterproofing product, forming the seamless weatherproof layer over the main roof area.
Flat roof refurbishment without replacement
A liquid-applied flat roof waterproofing system with European Technical Assessment ETA-23/0735, backed by a 10-year product guarantee issued by HYDRONYLON LTD to the Approved Contractor. Applied over your existing roof, without strip-off.
- ETA-23/0735 certified European Technical Assessment
- 10 years confirmed durability Assessed system performance
- Seamless system, formed in place No laps or joints to fail
- London-based supply & training Stock and support in the UK
The problem
Your flat roof is failing. Replacement is not the only option.
Common flat roof problems
- Leaking felt. Water finds its way through aged laps, blisters and splits, and the leak rarely sits directly above the stain on the ceiling.
- Ponding water. Standing water after rain accelerates the breakdown of the existing covering and shortens the life of every patch repair.
- Cracked surface. UV exposure and thermal movement open cracks in the surface faster than spot repairs can keep up with.
The overlay alternative
HYDRONYLON is applied directly over the existing covering, so there is no strip-off, no skips on the drive and no days with the building open to the weather.
The liquid cures into a seamless waterproof membrane formed in place around every outlet, upstand and penetration, with no laps or joints to fail later.
Because the existing covering stays in place, refurbishment with HYDRONYLON typically costs significantly less than a full re-roof and takes days rather than weeks.
See where the system is usedThe process
From survey to guaranteed roof
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Survey
An Approved Contractor inspects the roof, checks the existing build-up and confirms that the covering can stay in place.
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Preparation
The surface is cleaned, local defects are made good and the substrate is primed with Primer Emulsion EG.
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Application
The liquid system is applied with Technical Mesh SW-1 reinforcement, forming a seamless waterproof layer around every detail.
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Sign-off and guarantee
The completed roof is signed off and backed by a 10-year product guarantee issued by HYDRONYLON LTD to the Approved Contractor. Ask your Approved Contractor about the guarantee terms.
For roofing professionals
Become a HYDRONYLON Approved Contractor
Trade pricing
Buy the complete system at contractor rates, with stock held and supplied from London.
Certified training
Hands-on training for £250 covering survey, preparation and application, finishing with assessment and accreditation.
A product guarantee on every project
Receive a 10-year product guarantee from the manufacturer's UK distributor, issued to you for each completed project, a strong reassurance to put in front of your clients.
Products
Five products. One system.
HYDRONYLON HN
Liquid-applied waterproofing used within the system build-up where the specification requires it.
HYDRONYLON HMS-P
System component for upstands, penetrations and detail areas.
Primer Emulsion EG
Primer that prepares felt, asphalt, concrete and metal substrates for the system.
Technical Mesh SW-1
Reinforcement mesh embedded within the liquid layers for strength at details and across full surfaces.
Case studies
Recent projects
Hatton Garden, London
Teddington
FAQ
Frequently asked questions
What is HYDRONYLON?
HYDRONYLON is a liquid-applied flat roof waterproofing system that holds European Technical Assessment ETA-23/0735. It is applied cold in liquid form and cures into a seamless, fully bonded waterproof layer over the existing roof. In the UK it is supplied and supported by HYDRONYLON LTD, a British company with European-certified technology.
How much does flat roof refurbishment with HYDRONYLON cost?
The cost depends on the condition of the roof, its area and the amount of detailing, so every project is priced individually after a survey. Because the existing covering stays in place, refurbishment with HYDRONYLON is typically significantly more economical than a full re-roof and faster to complete. For a quotation, speak to an Approved Contractor or contact us directly.
How long does the HYDRONYLON system last?
The durability of the system is 10 years confirmed under European Technical Assessment ETA-23/0735. Because the cured layer is seamless and fully bonded, there are no laps or joints to fail over time, and localised damage can be repaired by reapplying the liquid system to the affected area.
Do I need to remove my old roof covering first?
In most cases, no. The system is designed as an overlay and is applied directly over sound felt, asphalt and concrete after cleaning and priming. A survey confirms whether the existing build-up can stay in place. Avoiding strip-off shortens the work on site and removes waste disposal costs.
Who can install HYDRONYLON?
Installation is carried out by HYDRONYLON Approved Contractors (HAC), roofing professionals trained and assessed by HYDRONYLON LTD. Each completed project is backed by a 10-year product guarantee issued by HYDRONYLON LTD to the Approved Contractor; ask your contractor about the guarantee terms. Roofing professionals can join the programme through certified training for £250.
Talk to us about your roof
Send us the size and a photo of your roof and we will come back with the next step, whether that is a survey, a quotation or a contractor near you.