Restore, Don't Replace
The majority of flat roofs — even those 20-30 years old — can be fully reconditioned and waterproofed in situ, saving thousands over complete roof replacement.
Trusted flat roof repair and waterproofing solutions throughout Dublin city and county. Our specialist liquid-applied systems prevent leaks, recondition worn roofs, and safeguard your property with manufacturer warranties of up to 25 years.
Dublin's urban environment — with its dense building stock, aging extensions, and exposure to easterly winds and persistent rain — makes flat roof waterproofing an essential investment for property owners across the city and county.
Flat roof problems are among the most common issues homeowners and landlords encounter across the region. Traditional roofing materials like felt and asphalt deteriorate under Ireland's wet climate, leaving properties vulnerable to costly water damage.
The video demonstrates how modern liquid-applied waterproofing technology has transformed flat roof protection. These high-performance membranes are purpose-built to handle permanent ponding water, maintaining their integrity regardless of weather extremes.
Our flat roof waterproofing systems:
Based in Ballymount, Dublin 12, our team provides rapid-response flat roof leak repair, restoration, and full waterproofing for properties of every size. From Victorian-era extensions in Rathmines and Ranelagh to modern apartment developments in Sandyford and Tallaght, we deliver proven, long-lasting roof protection — without the upheaval of stripping and rebuilding your roof. Learn more about our commercial flat roof coating services and our team.
From our Dublin base, we carry out professional flat roof repairs and waterproofing using cutting-edge liquid membrane systems that restore, reinforce, and dramatically prolong the service life of existing roofs.
Our systems are ideally suited for:
As the video shows, the overwhelming majority of flat roof issues can be resolved through reconditioning rather than full replacement. We routinely restore roofs that other contractors would recommend tearing out, using liquid waterproofing combined with structural reinforcement matting. We also offer specialist asbestos roof waterproofing and polyurea roof coating systems for demanding applications.
This approach allows us to:
Whether you're dealing with an active leak in Blanchardstown, visible wear on a Dún Laoghaire apartment block, or planning preventative maintenance for a Dublin city centre commercial building, we engineer a purpose-built waterproofing system that delivers long-term results with minimal disruption to occupants.
Watch: Reconditioning existing felt roofs with liquid membrane
Every project follows the same rigorous four-stage methodology — because cutting corners on preparation is the main reason flat roof repairs fail.
The first stage involves power-washing and decontaminating the entire roof surface to strip away accumulated dirt, moss, lichen, and atmospheric pollutants common on urban rooftops. A pristine substrate is essential — the waterproofing system bonds mechanically and chemically to the surface.
No waterproofing system can perform to specification on a contaminated or poorly prepared roof deck.
Moss, root systems, leaf litter, and trapped detritus are fully removed and drainage outlets cleared. Sheltered courtyards and north-facing extensions are particularly prone to vegetation buildup that holds moisture against the roof membrane and accelerates decay.
Watch: LAVA 20 application on asphalt roof
Watch: Applying liquid membrane over fibreglass matting
Before any waterproofing material is applied, we identify and repair every crack, split joint, failed lap, and corroded fixing across the roof deck.
As demonstrated in the video, this typically includes:
With the substrate fully prepared and reinforced, the liquid waterproofing membrane is applied in controlled, overlapping passes to build a continuous, multi-layer protective shield.
The system is constructed in stages:
The completed system forms a single, monolithic waterproof membrane — fully bonded to the existing roof, resistant to standing water, and capable of accommodating the thermal expansion and contraction typical of urban rooftops.
For Dublin property owners and facility managers, liquid-applied waterproofing delivers measurable advantages over conventional re-roofing — faster installation, lower cost, and decades of proven protection.
Watch: Why installers prefer this system over traditional fibreglass
The majority of flat roofs — even those 20-30 years old — can be fully reconditioned and waterproofed in situ, saving thousands over complete roof replacement.
Unlike sheet membranes with lapped seams, the liquid coating cures into one continuous, impermeable layer — removing the single biggest source of flat roof leaks.
Most residential flat roofs are completed within 1-2 days. No naked flames, no heavy machinery — safe for occupied homes, schools, and commercial premises.
The cured membrane stretches and recovers with the building's natural thermal movement, preventing the cracking and splitting that plagues rigid roofing systems in changeable weather conditions.
Tested against driving rain, UV degradation, freeze-thaw cycling, and prolonged ponding — the system is specifically validated for the conditions Irish roofs face year-round.
Reconditioning typically costs 40-60% less than full replacement. With no skip hire, no scaffolding, and minimal labour hours, property owners see real savings without compromising on quality.
With its outstanding adhesion, flexibility, and long-term durability, liquid waterproofing consistently outperforms traditional roofing methods — making it the preferred choice for property owners who demand reliable, lasting results.
From Terraced Houses to Industrial Estates
Our liquid waterproofing systems protect flat roofs of every type and scale across the region — from compact rear extensions to expansive commercial rooftops.
We also serve Cork — see our flat roof waterproofing Cork page for details.
Whether it's a period-home extension in Ranelagh or a multi-unit commercial roof in Blanchardstown, our proven waterproofing system delivers lasting protection you can depend on.
Watch: Restoring and waterproofing existing flat roofs
Roof Protection You Can Count On for 25 Years
Our flat roof waterproofing systems are installed in strict accordance with manufacturer specifications and supported by long-term warranties of up to 25 years, giving property owners reliable protection and genuine peace of mind. We utilise advanced systems such as the LAVA 20 waterproofing system for proven, long-term results.
As demonstrated in the video, many roofs that appear to be at the end of their life do not need to be ripped apart or replaced. In many cases, existing felt roofs — even those already decades old — can be professionally cleaned, reconditioned, detailed, and fully waterproofed using advanced liquid-applied systems. Even valley leak repairs can be addressed as part of the reconditioning process.
Our approach:
For you, this means:
By combining proven installation methods with manufacturer-backed warranties, we deliver reliable, future-proof waterproofing solutions that protect your property long after the work is complete.
Answers to common questions from Dublin property owners about our flat roof waterproofing services. Visit our main FAQ page for general enquiries.
Yes. We cover every Dublin postcode from Dublin 1 to Dublin 24 and beyond — including Fingal, South Dublin, and Dún Laoghaire-Rathdown. Our base in Ballymount, Dublin 12 means we can reach any Dublin location quickly.
As we're based in Dublin 12, we can often arrange same-day or next-day inspections across the city and county. For emergency leaks or storm damage, we offer priority callouts throughout Dublin.
Absolutely. Many of Dublin's Georgian, Victorian, and Edwardian properties have flat-roofed extensions that require specialist waterproofing. Our liquid-applied systems are ideal for these complex roof profiles because they conform to irregular shapes and details without mechanical fixings.
We waterproof every type of flat roof found across Dublin — felt, bitumen, asphalt, EPDM, TPO, fibreglass, concrete, and metal. This includes residential extensions, garages, apartment blocks, commercial units, schools, and industrial buildings.
Every roof is different, so we provide free, no-obligation on-site inspections and transparent quotations. Pricing depends on roof area, current condition, and the system specified. There are no hidden fees — you'll receive a full breakdown before any work begins.
In the vast majority of cases, yes. Our liquid-applied systems bond directly over existing felt, bitumen, and other substrates after proper cleaning and preparation. This avoids the cost, waste, and disruption of stripping the old roof entirely.
We offer manufacturer-backed warranties of up to 25 years, depending on the system and specification. Full warranty documentation is provided upon completion of every Dublin project.
We serve all of Dublin city and county: Swords, Malahide, Howth, Clontarf, Drumcondra, Glasnevin, Blanchardstown, Castleknock, Lucan, Clondalkin, Tallaght, Rathfarnham, Dundrum, Stillorgan, Blackrock, Dún Laoghaire, Sandyford, Ballsbridge, Rathmines, Ranelagh, and every area in between.
Whether your Dublin flat roof is leaking, showing cracks, or simply due a professional assessment, our free inspection gives you a clear picture of its condition — and what it will take to protect it for the long term.
Because we're based locally in Ballymount, Dublin 12, we can often arrange same-day or next-day inspections across the region. You'll receive a comprehensive written quotation — typically within one hour of the visit. Visit our blog for more information about flat roof maintenance and waterproofing best practices.
What you can expect:
Get in touch today to arrange your free flat roof inspection in Dublin. Property owners across the city and county trust Dublin Protective Coatings for professional, warranty-backed flat roof repair and waterproofing.
