Flat Roof Solutions
Liquid Waterproofing
Transform your ageing or leaking flat roof with our advanced liquid-applied waterproofing systems. Seamless, durable, and backed by 20-year guarantees - the modern alternative to traditional felt and asphalt roofing.
What is commercial liquid waterproofing?
Commercial liquid waterproofing is a cold-applied, seamless membrane installed in successive coats with polyester fleece reinforcement to create a fully bonded, joint-free waterproof layer over flat or low-pitched roofs. It is the modern replacement for felt and asphalt because it eliminates seams, laps, and hot works (the three things that cause traditional flat roofs to fail). Systems are typically rain-safe in 20–30 minutes and back a 20-year guarantee.
Why Liquid Waterproofing Outperforms Felt and Asphalt
Liquid systems eliminate the seams and laps where 95% of traditional flat roof leaks originate. A fleece-reinforced cold-applied membrane bonds fully to the substrate and conforms perfectly to upstands, outlets, and pipe penetrations, leaving no mechanical joints to fail.
Unlike felt or asphalt, liquid systems contain no heat-welded laps, no torch-applied bitumen, and no fire risk. They cure within hours, remain permanently flexible to absorb thermal movement, and accept foot traffic, plant equipment, and solar PV installations without compromising performance.
Our 4-Stage Application Process
Every project follows a controlled four-stage sequence: detailed site survey and substrate assessment, full surface preparation with priming, reinforced base coat application with polyester fleece, then a UV-stable topcoat. The whole process is designed to be completed without disrupting building operations.
On a standard 500m² industrial roof, this typically completes in two to five working days. Larger sites are sectioned and progressed bay-by-bay so the building remains fully occupied throughout. We provide written method statements, RAMS, and photographic records for every project.
Liquid Waterproofing vs Single-Ply and EPDM
Single-ply and EPDM rely on heat-welded or adhesive seams between sheets, leaving the same potential failure points as felt at every lap. Liquid waterproofing has zero seams (the membrane is one continuous, fully bonded layer) and overlays the existing roof without strip-out, eliminating waste disposal and structural loading concerns.
For complex roofs with multiple penetrations, upstands, or geometric features, liquid is significantly faster to install than sheet systems. It is also the only flat roof option that detail-bonds seamlessly around pipes, rooflights, and parapets without preformed accessories.
What Does Liquid Waterproofing Cost?
Commercial liquid waterproofing typically costs £20–£40 per square metre fully installed including surface preparation, primer, reinforced membrane, and UV-stable topcoat. A 500m² industrial roof equates to approximately £10,000–£20,000, comfortably less than half the cost of strip-and-replace re-roofing.
Pricing is fixed in writing following our free site survey, with no hidden extras for substrate repairs, primer, or detailing. Every installation includes a 20-year guarantee.
Key Features
Seamless Application
Our liquid membrane creates a continuous, joint-free waterproof layer that conforms to any shape or detail.
Cold Applied
No hot works required. Our systems are applied at ambient temperature, eliminating fire risks on site.
Rapid Cure Times
Most systems are rain-safe within minutes and fully cured within hours, minimising weather delays.
Reinforced Systems
Polyester fleece reinforcement provides exceptional tensile strength and crack-bridging capability.
UV Stable Finishes
High-performance topcoats resist UV degradation, maintaining appearance and performance for decades.
Overlay Existing Roofs
Can be applied directly over existing substrates including felt, asphalt, concrete, and metal.
The Advantages
Why Choose This Solution?
Our liquid waterproofing service delivers lasting results with minimal disruption to your business operations.
Our Process
From initial survey to final inspection, we follow a proven methodology to ensure quality results every time.
Site Survey
Our technical team assesses your roof condition, takes measurements, and identifies any areas of concern.
Specification
We design a tailored system based on your roof type, usage requirements, and budget.
Preparation
Surface is cleaned, repaired, and primed to ensure optimal adhesion of the liquid membrane.
Application
Multiple coats of liquid membrane are applied with reinforcement, creating a seamless waterproof barrier.
Common Questions
How long does liquid waterproofing last?
Our liquid waterproofing systems are designed to last 20+ years when correctly installed and maintained. We back this with 20-year guarantees, long-term workmanship guarantees that give building owners confidence in the installed system.
How much does commercial liquid waterproofing cost?
Commercial liquid waterproofing typically costs £20–£40 per square metre, including surface preparation, primer, reinforced liquid membrane, and UV-stable topcoat. For a 500m² industrial roof this equates to approximately £10,000–£20,000, often with a 20-year guarantee included. We provide free site surveys and fixed-price quotations with no obligation.
Does the existing roof need to be stripped before liquid waterproofing is applied?
In the vast majority of cases, no strip-out is required. Our cold-applied liquid systems can be installed directly over most existing substrates, including old felt, asphalt, concrete deck, steel deck, and failed single-ply membranes, eliminating strip-out costs and waste disposal fees, and significantly reducing project timescales.
How long does liquid waterproofing take to install on a commercial roof?
Most standard commercial roofs up to 500m² can be completed within two to five working days. Larger roofs are sectioned and completed progressively so the building remains occupied throughout. Our rapid-cure systems are rain-safe within 20–30 minutes of application, keeping the project on schedule regardless of weather conditions.
Can you apply liquid roofing in wet weather?
The substrate must be dry for application, but our rapid-cure systems become rain-safe within 20–30 minutes. We carefully monitor weather conditions and plan application windows accordingly to ensure optimal adhesion and cure.
Is liquid roofing suitable for flat roofs?
Absolutely. Liquid roofing is ideal for flat and low-pitched roofs where traditional materials can struggle. The seamless, joint-free finish eliminates the weak points where water ingress most commonly occurs, sheet laps, upstand junctions, and pipe penetrations.
What preparation is needed before liquid waterproofing is applied?
We thoroughly clean the existing surface, carry out any necessary substrate repairs, and apply a system-specific primer to ensure maximum adhesion. The extent of preparation depends on the substrate condition identified during the initial survey, all preparation is included in our fixed-price quotation.
Liquid Waterproofing Across the UK
We deliver liquid waterproofing from our Hellaby, Rotherham headquarters to commercial buildings across England, Scotland and Wales. Explore some of our most active service areas:
Related Services
We offer a complete range of specialist commercial roofing services across the UK.
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Industrial Drainage Solutions
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Liquid-applied seamless gutter liners that eliminate joint failures and protect commercial drainage systems for decades.
Safe Roof Management
Asbestos Encapsulation
HSE-compliant encapsulation systems that seal asbestos cement roofs safely, up to 70% cheaper than removal and disposal.
Ready to Get Started?
Contact us today for a free, no-obligation site survey and quotation.