Too many vulnerable details
Rooflights, pipes, outlets, corners and upstands multiply the number of interfaces a sheet system must form around.
Prokol MonoSeal · domestic liquid roofing
MonoSeal liquid roofing.For complex domestic flat roofs.
Pure-polyurea waterproofing for suitable complex domestic flat roofs, balconies and overlay applications.
Warranty terms in writingBROOF(t4)1530% elongation
Tell us about your roof
Send photographs, dimensions, postcode and the current problem.
Request assessment 01254 4339871530%
Published elongation
Manufacturer data
Pure polyurea
3GTX technology
Hand-applied membrane
Seamless
Detail-led system
No sheet membrane seams
BROOF(t4)
External fire performance
Tested classification
Why homeowners choose it
EPDM can suit straightforward roof areas. MonoSeal can be more suitable where complex details, irregular geometry or retained surfaces make sheet application less practical.
The problems it solves well
Complex details need careful waterproofing.
MonoSeal creates a continuous membrane across the roof field and its details, but only after the underlying problem has been properly identified.
An awkward existing roof
Changes in level, irregular geometry and retained waterproofing can make a strip-and-sheet solution disproportionately disruptive.
Recurring leaks at junctions
The main roof covering may be serviceable while transitions, edges or penetrations repeatedly admit water.
Appearance and intended use matter
Visible roofs, balconies and terraces need a specification that considers waterproofing, appearance and intended use together.
Domestic applications
A continuous membrane around complex roof details.
Complex extension roofs
A seamless route around rooflights, lanterns, parapets, outlets and multiple changes in geometry.
Balconies + terraces
Waterproofing designed around thresholds, edges, outlets and the specified traffic or finish requirement.
Dormers + bay roofs
Compact, detail-heavy areas where sheet cutting and multiple junctions can become the weak point.
Garage + garden rooms
A liquid-applied option where the roof shape, visible finish or retained substrate makes sheet application less practical.
Existing roof overlays
Potentially avoids unnecessary strip-back where the existing build-up is dry, stable, compatible and properly prepared.
Roof detail refurbishment
MonoSeal Detail can treat intricate areas without reinforcement fleece, subject to the confirmed specification.
EPDM or MonoSeal?
Choose the system from the roof condition.
Roof conditionLikely routeWhy
Simple new timber deckUsually EPDMA single sheet is efficient and economical where geometry is clean.
Multiple rooflights or penetrationsUsually MonoSealSeamless application reduces separate formed junctions.
Irregular or changing geometryUsually MonoSealLiquid application follows the real shape of the roof.
Suitable existing waterproofingAssess MonoSeal overlayCondition, moisture, adhesion and compatibility must pass first.
Wet, rotten or unstable deckNeither yetStrip back, investigate and repair the build-up before waterproofing.
Straightforward garage or extensionUsually EPDMA single-sheet system may offer better value where the roof is suitable.
Balcony or terraceAssess MonoSealWaterproofing, thresholds, drainage and final use must be specified together.
Warranty availability is subject to the approved system specification, substrate preparation, trained installation, inspection records and applicable warranty terms.
The specification route
The finish is only as good as what sits beneath it.
01Diagnose
Establish whether the issue is the covering, detail, deck, drainage or trapped moisture.
02Test
Confirm substrate stability, dryness, adhesion, contamination and compatibility.
03Specify
Set preparation, primers, membrane build-up, detail treatment and finish.
04Deliver
Use trained approved contractors with project records and inspection points.
05Protect
Complete qualifying warranty documentation and define future inspection requirements.
MonoSeal on domestic roofs
The details become part of one continuous finish.
A liquid-applied membrane can be useful around rooflights, parapets, outlets, thresholds and changes in level. These photographs show the application and completed finish.
When MonoSeal is not the answer.
Wet, rotten or unstable decks
Unresolved structural movement
Contaminated or incompatible substrates
Poor drainage left uncorrected
A simple roof where EPDM gives better value
Any project without the required preparation
Clear answers
MonoSeal domestic roofing answers
Direct answers about warranties, overlays, details, balconies and choosing between MonoSeal and EPDM.
What is Prokol MonoSeal?
MonoSeal is a hand-applied waterproofing membrane based on pure polyurea with Prokol 3GTX technology. Once correctly cured it forms a seamless, durable membrane over suitable prepared flat or slightly pitched roofs, existing waterproofing, wood and mineral or cement-bound substrates.
What makes MonoSeal suitable for domestic flat roofs?
Its value is strongest on complex and highly detailed roofs. Liquid application follows upstands, outlets, rooflights, penetrations and changes in geometry without introducing a separate sheet joint at every transition. Suitability still depends on substrate condition, preparation, detailing and application.
Is MonoSeal better than EPDM?
MonoSeal may be more suitable where seamless detailing, irregular geometry or a compatible overlay is required. EPDM may be more economical for straightforward garages, extensions and clean timber-deck roofs.
Are warranties available for MonoSeal roofing?
Warranty availability depends on the approved specification, preparation, application, inspection records and the applicable written supplier or manufacturer terms. It is not automatic for every roof.
Can MonoSeal be installed over an existing flat roof?
Potentially. Existing waterproofing must be identified and assessed for moisture, stability, adhesion, contamination, drainage and compatibility. Unsound layers or trapped moisture cannot be hidden beneath a new membrane.
Can MonoSeal waterproof balconies and terraces?
MonoSeal can be specified for balconies and terraces, but thresholds, drainage, falls, movement, intended traffic and the final surface finish all need to be resolved as one system. An anti-slip or colour-stable finish may be required depending on use.
What is MonoSeal Detail?
MonoSeal Detail is the hand-applicable pure-polyurea detail product in the system. Manufacturer information states that it can waterproof intricate roof details without reinforcement fleece, simplifying areas such as penetrations and junctions. Required thickness and any second layer remain specification-led.
What fire classification does MonoSeal have?
Manufacturer information lists external roof-fire classifications including BROOF(t1) and BROOF(t4) under EN 13501-5. The classification must be referenced against the tested roof build-up and project requirement rather than treated as a universal claim for every substrate.
How flexible is MonoSeal?
Prokol reports elongation of 1530% for the cured MonoSeal membrane. That supports movement accommodation and complex detailing, but it does not remove the need to repair unstable substrates or resolve structural movement before application.
How do I get a MonoSeal roof assessed?
Send the postcode, roof dimensions, photographs, roof use and known problems. Forti Nova can review the details, arrange an assessment and connect suitable work with trained approved contractors.
MonoSeal roof assessment