Liquid Roof Waterproofing
Liquid waterproofing for flat and low-pitched roofs – extend your roof’s lifespan with the Lava 20 System.
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Spot signs your roof needs waterproofing
Do you have a flat or low-pitched roof that could use some TLC? Is your flat roof leaking due to constant exposure to humidity, ultraviolet solar radiation and temperature fluctuations?
Waterproofing that keeps water out
Our team of Dublin roofers use a specially formulated liquid silicone and polyurethane coating known as the Lava 20 System. It provides a smooth, elasticated coating for low-pitched roofs and balconies, creating a waterproof membrane that helps your roof deal with:
Waterproofing keeps moisture out
The Lava 20 System is an affordable, effective and long-lasting liquid roof waterproofing solution that also adds a layer of thermal insulation to your property. It is resistant to chemical damage, oils and detergents, making it ideal for medium foot traffic.
Images From Our Liquid Roof Waterproofing
A selection of recent liquid roof waterproofing jobs across Dublin.
What Our Customers Say
Many happy clients across Dublin — check out our customer recommendations.
Why customers choose us for roof waterproofing
The highly skilled roofing contractors at D.Hennessy Roofing specialise in roof restoration, giving roofs a new lease of life with simple and effective liquid roofing solutions.
Free, no-obligation quotes
A clear price before any work starts — no surprises.
25+ years of experience
Decades of fixing every kind of Dublin roof.
Licensed & insured
Fully covered, with National Guild membership.
24/7 emergency call-outs
Urgent leaks answered around the clock.
Guaranteed workmanship
Every repair we make carries a 10-year guarantee.
Extremely versatile
Roofs, balconies, wet areas, walkways, water tanks and terraces.
A Simple, Stress-Free Process
From your first call to the final clean-up, here’s exactly what to expect when you work with D. Hennessy Roofing.
01
Tell Us About Your Roof
Call or send us a few details about the issue — a photo helps us understand it before we arrive.
02
Free Inspection & Quote
We inspect the roof properly and give you a clear, fixed quote — no pressure, no surprises.
03
We Get to Work
Agree a schedule that suits you, then our team carries out the work to the highest standard.
04
Clean-Up & Handover
We leave your site tidy, walk you through the finished work, and hand over any paperwork.
05
Enjoy Peace of Mind
With a 20-year guarantee on new roofs, you can relax knowing the job is done right.
06
We Stay in Touch
Most of our work comes from referrals — we aim to earn yours too.
Areas We Cover for Liquid Roof Waterproofing
We repair roofs right across Dublin — from the North County down to the South County.
North Dublin
Swords, Malahide, Santry and Glasnevin.
City Centre
Dublin 1–7 and the surrounding suburbs.
South Dublin
Ballsbridge, Donnybrook, Rathgar and Dundrum.
Dublin West
Lucan, Clondalkin and Tallaght.
North County
Swords, Balbriggan and Skerries.
South County
Dún Laoghaire, Blackrock and Dalkey.
Liquid Roof Waterproofing Questions, Answered
The things Dublin homeowners ask us most about repairs.
Almost anywhere – roofs, balconies, wet areas, walkways, water tanks and terraces. It can also be used for detailing on chimneys, pipes, solar panel systems and guttering to create a waterproof seal.
Usually, yes. We source matching tiles, slates and materials so the repair blends in with the rest of your roof rather than standing out.
Where the damage is localised, a repair is almost always the right call — it fixes the problem for a fraction of the cost of a new roof. We'll always be honest about which you need.
Yes. Every repair is covered by our 10-year workmanship guarantee, and we're fully licensed and insured for your peace of mind.
Need your roof waterproofed?
Get a free quote or a fast emergency call-out.
Ready to waterproof your roof?
Get a free quote — or fast emergency help if the roof is leaking now.