Our Coating Guarantee | Up to 20 Years
Accredited, insured and audited
IPAFPOWERED ACCESS TRAINED£10mPUBLIC LIABILITYIPAFPOWERED ACCESS TRAINED£10mPUBLIC LIABILITYEvery coating system we apply carries a guarantee of up to 20 years. That term is set at survey stage, against the building in front of us, not promised on the phone and quietly trimmed later.
What the coating guarantee covers
A guarantee is only worth what it covers, so here it is in plain terms. Cover extends to the things that are genuinely ours to answer for:
- Coating adhesion failure
- Premature weathering beyond normal expectations for the specified system
- Water penetration through the coating system
- Delamination or peeling
- Defects in materials or in our application workmanship
What no honest contractor will cover is a building that was never suitable in the first place. If the substrate is failing, the deck is wet or the sheets are past saving, a coating is the wrong answer, and we will say so at survey stage rather than sell you a guarantee that could never pay out.
Why the survey decides the term
The length of your coating guarantee is decided by the building, not by the sales pitch. A sound profiled roof with sixty per cent of its life left is a very different proposition to one with corrosion through the sheet laps and moisture sitting in the insulation. Our surveyor gets onto the roof, photographs the condition, records the readings that matter and writes the specification around what is actually there. Only then is a term put in writing.
Where a building will not support the full term, we tell you the shorter one at survey. A ten year guarantee you can rely on is worth considerably more than a twenty year one that quietly excludes half your roof.
How the paperwork protects you
Preparation specified, film thickness measured, stages photographed, sign-off recorded. That record is what turns an application into a guaranteed system, and it is the same record that settles matters quickly if you ever need to call on it. Every stage is photographed as we go, which is why our case studies show the condition we started with rather than only the finished elevation.
Making a claim
If something goes wrong within the guarantee period, contact us with the building address and your original specification reference. We inspect it. Where the fault sits with the coating or with our workmanship, it is put right. We would rather return to a building once than argue about it. The buildings in our case studies are the ones we still get invited back to.
Common questions about our coating guarantee
Is the coating guarantee transferable if I sell the building?
Tell us at survey stage that the building may change hands and we will confirm in writing what the specified system allows, before you commit to anything.
Does it cover the whole roof or only the coated area?
It covers the system we applied, over the area set out in the survey. Anything outside that scope, such as rooflights we were asked not to touch, for instance, sit outside the guarantee, and that is written down at the start rather than produced afterwards.
What voids a coating guarantee?
Typically: alterations by others, mechanical damage, new penetrations cut through the coating without reinstatement, and neglect of the maintenance set out in the specification. None of it is unusual, and all of it is stated in writing before work begins.
Do I need to maintain the coating for the guarantee to stand?
Yes. Most systems require periodic inspection and gutter clearance, which is ordinary building maintenance rather than a hidden obligation. The requirement is stated in your specification at the outset.
How long does a coating guarantee last on an asbestos roof?
Encapsulation is assessed exactly like any other roof: condition first, term second. The survey establishes whether the sheets will carry the system for the full period, and the answer goes in writing before you decide anything.
If you want to know what term your building will actually support, the honest answer only comes from standing on it. Book a free no-obligation site survey and we will tell you what the roof needs, what it does not, and what we are prepared to guarantee. For the standards behind this work, the Health and Safety Executive publishes guidance on working on fragile roofs, which governs how every survey and application we carry out is planned.
Coating or replacement: when each approach is appropriate
A coating can extend the serviceable life of a sound roof or building envelope without the disruption involved in full replacement. It is often appropriate where the existing substrate remains stable, defects are localised and the waterproofing detail can be prepared and treated effectively. Applied correctly, coatings can also provide a continuous finish around laps, seams, penetrations and other vulnerable areas.
Replacement wins when the underlying construction has reached the end of its useful life. We would not recommend coating over widespread corrosion, extensive delamination, persistent trapped moisture, rotten decking, failed insulation or structural movement. A coating guarantee cannot compensate for an unsound substrate.
There are also cases where opening up the roof is necessary to correct falls, drainage, thermal performance or concealed defects. In those circumstances, replacement or substantial remedial work is the more dependable course. Our survey is intended to establish that distinction before a coating specification is proposed.
Preparation and detailing behind the coating guarantee
The finished surface is only the visible part of the work. The reliability of protective and waterproof coatings depends heavily on preparation, adhesion and the treatment of details that interrupt the main area.
Substrate preparation
We assess contamination, corrosion, loose material, previous finishes and residual moisture before application. Cleaning and preparation must create a sound, compatible surface; simply covering defects risks transferring the same weakness into the new coating system.
Waterproofing details
Joints, laps, seams, upstands, outlets, fixings and penetrations require particular attention. We repair or reinforce these areas as specified before applying the main coating. Ponding water, blocked drainage and poorly formed interfaces must also be addressed where they could undermine long-term waterproofing performance.
Application control
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We check that weather and surface conditions are suitable for application and curing.
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We apply each coating in the required sequence, allowing appropriate curing between stages.
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We monitor coverage and film build rather than relying on appearance alone.
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We inspect vulnerable details and completed areas before the work is signed off.
These practical controls help ensure that the coating guarantee relates to a properly surveyed, prepared and applied system. Its precise scope remains subject to the agreed specification, the condition of the substrate and the stated maintenance requirements.
Get a free site survey, no obligation
One of our surveyors walks the building, photographs the condition and quotes only what it actually needs. Send us the details and we'll come back with a clear, practical route, not a hard sell.
Book your free site surveyWhy choose NCS
Why businesses trust National Coating Specialists
Where we work
Sectors and buildings we coat
Survey-led coating, spraying and exterior refurbishment across commercial, industrial and agricultural property in the UK.
Recent work
Recent projects, documented survey to handover
Book a free, no-obligation site survey
We coat and refurbish commercial, industrial and agricultural roofs and walls in place, right across the UK. Tell us about your building and we’ll arrange a survey at a time that suits you.
Accredited, insured and audited
IPAFPOWERED ACCESS TRAINED£10mPUBLIC LIABILITYIPAFPOWERED ACCESS TRAINED£10mPUBLIC LIABILITYWhat does your building need?
Pick the surface, then the problem. We will point you to the right service.