Finished metal roofs
Falmouth, England: finished silicone-coated roofs at Tresidder Close (UK project).
No strip-offSeamless finish
Commercial Roof Waterproofing · Lisburn
Commercial Roof Waterproofing in Lisburn — GacoFlex S42 Silicone Roof Coating
Refurbish leaking flat, metal and low-slope roofs in Lisburn without strip-off — GacoFlex S42 silicone, applied by approved installers.
20-year manufacturer-backed product warrantyFree roof surveyApproved installers across Ireland & Northern Ireland
Restoration, not replacementCold applied · 20-year warranty
20-year
Manufacturer-backed product warranty
No strip-off
Coated over the sound existing roof
Cold applied
No hot works on the roof
Free
Roof survey and written quote
Why coat
Why coat rather than replace a Lisburn commercial roof?
Most leaking commercial roofs in Lisburn and the wider County Antrim area do not need tearing off. Where the deck and existing covering are sound enough, GacoFlex S42 silicone is applied over the prepared roof as a continuous, joint-free waterproof layer, with far less waste and disruption than a replacement.
Every Lisburn roof is surveyed first — substrate, adhesion, drainage and details — so the specification matches the roof you actually have.
- ✓Seamless silicone membrane with no laps
- ✓Applied over felt, asphalt, single-ply and metal
- ✓Cold applied, so no torches on the roof
- ✓20-year manufacturer-backed product warranty
The finished result
What a coated commercial roof actually looks like
A completed GacoFlex silicone roof coating, photographed after completion. The caption says where the photo was taken.
Coat or replace?
Is your Lisburn roof end-of-life — or just end-of-surface?
Most leaking commercial roofs do not need tearing off. Where the deck and existing covering are sound enough, GacoFlex S42 silicone is applied over the prepared roof as a continuous, joint-free waterproof layer. The survey checks the deck, adhesion and drainage before anything is specified.
Recognise two or more of these? Coating is worth a survey — the free Lisburn roof survey confirms it either way.
✓
Leaks through splits, blisters or failed laps
✓
Ageing felt or asphalt that has cracked and lost flexibility
✓
Rusting laps, fixings or sheets on a profiled metal roof
✓
Leaks starting at upstands, rooflights, gutters or penetrations
✓
A building that needs to stay in use while the roof is refurbished
Budget & pricing
How is commercial roof waterproofing priced in Lisburn?
It depends on roof area, condition, preparation and details, so we do not publish prices. After the free survey you receive a written quotation in sterling from the approved installer.
| What sets the price | What it covers | How it is confirmed |
|---|---|---|
| Roof area | The area of roof to be coated | Measured at the free survey |
| Condition | The deck, the existing covering and adhesion | Inspected at survey |
| Preparation | Cleaning, repairs and treatment of corroded laps and fixings | Set in the written specification |
| Details | Upstands, rooflights, gutters and penetrations | Recorded at survey |
What the survey and specification cover
Every quotation follows the same survey-led route, whichever county the building is in.
✓Substrate, adhesion, drainage and details checked
✓Preparation of the existing roof specified
✓Spray, brush or roller application chosen for the roof
✓Written specification and quotation in sterling
✓Application by an approved installer
✓Product documentation and warranty handover
The system
GacoFlex S42 silicone roof coating
20year manufacturer-backed product warranty on GacoFlex S42
Silicone, not foamSpray, brush or rollerSeamless, joint-free membrane
What goes on your roof
Silicone, not foam. GacoFlex S42 is a silicone liquid roof coating. It is not spray foam and is not an insulation product.
Seamless membrane. Applied as a liquid over the prepared roof, it cures into a continuous waterproof layer with no laps or seams.
✓20-year manufacturer-backed product warranty
✓Free roof survey
✓Approved installers across Ireland & Northern Ireland
✓info@duratite.ie
Replace or restore?
A leaking roof in Lisburn rarely needs tearing off.
Where the deck and existing covering are sound, GacoFlex S42 silicone restores the waterproofing in one seamless membrane while the building stays in use.
Head to head
Coating vs replacement for a Lisburn commercial roof
The same roof, two routes. The free survey establishes which one is right.
| What it means for you | GacoFlex S42 silicone coating | Full roof replacement |
|---|---|---|
| Existing covering | Coated over once sound and prepared | Stripped, skipped and replaced |
| The building below | Most buildings stay in use | Weather exposure and downtime while stripped |
| Joints and laps | Seamless, joint-free membrane | Depends on the new covering |
| Hot works | None — cold applied | Depends on the system chosen |
| Warranty | 20-year manufacturer-backed product warranty | Depends on the system and installer |
The honest caveat: a coating needs a sound deck and existing covering. The free Lisburn survey checks this before anything is specified.
Free roof waterproofing survey in Lisburn — no obligationTell us about the building and an approved installer covering County Antrim will be in touch.
Book a free survey Common problems
What building owners in Lisburn ask us to fix
Complex details
Upstands, rooflights, gutters and penetrations are where most leaks start. Liquid coatings are worked around every detail with no seams.
Corroding metal roofs
Rusting laps, fixings and sheet surfaces on profiled metal roofs are treated and sealed as part of the preparation and coating.
Replacement cost and disruption
Stripping a roof means skips, weather exposure and downtime. Coating works over the existing roof while the building stays in use.
Persistent leaks
Splits, blisters and failed laps let water in wherever the roof covering has aged. A liquid-applied membrane covers the whole surface, not just the leak you found.
The process
How it works
Send your details using the form below or email info@duratite.ie.
1
Free survey
An approved installer covering County Antrim visits, measures and inspects the building.
2
Specification
You receive a written specification and quotation in sterling for your building.
3
Installation
The approved installer carries out the work to the manufacturer’s requirements.
4
Warranty and handover
Product documentation and the manufacturer-backed product warranty are handed over on completion.
Duratite Ireland does not run a branch in Lisburn. The survey and installation are carried out by an approved installer who covers County Antrim.
Stage by stage
What the process looks like on a real roof
Photographs from a profiled metal roof coated with GacoFlex S42 silicone.
1 · First coat
First full coat of white S42 silicone going on over the prepared profiled roof.
Prepared firstLaps banded
2 · Finished coat
Completed GacoFlex S42 white silicone coating on a profiled metal roof between rooflights.
GacoFlex S42Profiled metal
3 · Checked
Film thickness checked with a comb gauge on the finished white silicone coat.
Quality checksSpecified thickness
The system
What goes on your Lisburn roof
Every Lisburn roof is surveyed first — substrate, adhesion, drainage and details — so the specification matches the roof you actually have.
| Feature | What it means for your roof |
|---|---|
| Silicone, not foam | GacoFlex S42 is a silicone liquid roof coating. It is not spray foam and is not an insulation product. |
| Seamless membrane | Applied as a liquid over the prepared roof, it cures into a continuous waterproof layer with no laps or seams. |
| Spray, brush or roller | The installer chooses spray, brush or roller application to suit the roof, the details and site conditions. |
| Cold applied | No hot works or torches on the roof, which suits occupied buildings and sensitive sites. |
| 20-year manufacturer-backed product warranty | Available when the system is specified and installed by an approved installer to the manufacturer’s requirements. |
GacoFlex S42 is a silicone liquid roof coating. It is not spray foam and is not an insulation product.
Recent projects
Duratite projects in the UK and Northern Ireland
Completed Gaco roof coatings, led by SAICA’s plant at Warrenpoint, County Down. Each caption says where the photo was taken.
Encapsulated roof
Completed white coating on an asbestos cement roof at SAICA, Warrenpoint, County Down.
Sheets left in placeNorthern Ireland project
Finished flat roof
Torquay, England: finished GacoFlex S42 silicone coating on a flat roof (UK project).
GacoFlex S4220-year warranty system
Coating around plant
Torquay, England: S42 silicone worked by hand around rooflights and plant (UK project).
Details worked by handNo hot works
The numbers
Commercial Roof Waterproofing in Lisburn at a glance
20-year
Manufacturer-backed product warranty
No strip-off
Coated over the sound existing roof
Cold applied
No hot works on the roof
Free
Roof survey and written quote
Northern Ireland
Roof refurbishment and regulations in Lisburn
A coating restores waterproofing but does not add insulation. Where refurbishment brings a roof within the Building Regulations (Northern Ireland) 2012, the guidance in Technical Booklet F2 applies. The survey flags whether your project triggers it.
Upgrading roof insulation at the same time can support a better EPC (Energy Performance Certificate), which is required in Northern Ireland when a building is sold or let.
Roof work is planned around safe access and work at height, in line with the requirements enforced by HSENI.
Local coverage
Where do you cover around Lisburn?
Approved installers cover County Antrim and the rest of Northern Ireland.
About Lisburn
A town or city in County Antrim, Northern Ireland.
- City south-west of Belfast on the M1
Quotations for Lisburn are issued in sterling.
Nearby areas
Commercial Roof Waterproofing pages for places near Lisburn:
Somewhere else? We cover all 26 counties of the Republic of Ireland and all 6 counties of Northern Ireland.
More services in Lisburn
Other systems surveyed and installed by approved installers:
- Spray Foam Insulation in Lisburn
- Gaco Asbestos Roof Waterproofing in Lisburn
- More on Commercial Roof Waterproofing
- All areas we cover
- Silicone roof coating in Ireland
- Warehouse roof repair: coat or replace?
- Building regulations in Northern Ireland
Every enquiry starts with a free survey.
Your questions answered
Frequently asked questions
Straight answers to the questions Lisburn building owners and managers ask most.
Do you provide commercial roof waterproofing in Lisburn?
Yes. Duratite Ireland takes enquiries from Lisburn and the wider County Antrim area and routes them to an approved GacoFlex installer who covers County Antrim. We do not have a branch office in Lisburn; the survey and application are carried out by the approved installer.
Can the building stay open while the roof is coated?
In most cases, yes. The system is cold applied with no hot works, and the work takes place on the roof rather than inside, so most Lisburn buildings stay in use. The installer agrees access and programme with you.
Can GacoFlex S42 go over my existing roof in Lisburn?
Often, yes. Silicone coating is applied over many existing roof types, including felt, asphalt, single-ply and profiled metal, once the surface is sound and properly prepared. The survey checks the deck, adhesion and drainage before anything is specified.
What warranty comes with a silicone roof coating in Lisburn?
GacoFlex S42 carries a 20-year manufacturer-backed product warranty when it is specified and installed by an approved installer to the manufacturer’s requirements.
How much does commercial roof waterproofing cost in Lisburn?
It depends on roof area, condition, preparation and details, so we do not publish prices. After the free survey you receive a written quotation in sterling from the approved installer.
Does a roof coating in Lisburn need to meet building regulations?
The coating itself does not add insulation. If the wider refurbishment brings the roof within the Building Regulations (Northern Ireland) 2012, Technical Booklet F2 applies, and the survey confirms whether that is the case.
Is GacoFlex S42 a spray foam?
No. GacoFlex S42 is a silicone liquid roof coating. It can be applied by spray, brush or roller, but it is a waterproofing membrane, not foam insulation.
Keep reading
Related services, projects & guides
Hub
Commercial Roof Waterproofing in Ireland
Products, applications and every area we cover.
Read more → Northern Ireland case studySAICA, Warrenpoint, County Down
Asbestos cement roofs encapsulated and coated in place at a working industrial plant.
Read the case study → ServiceSpray Foam Insulation in Lisburn
Spray foam insulation, surveyed and installed by approved installers.
Read more → ServiceGaco Asbestos Roof Waterproofing in Lisburn
Asbestos cement roof encapsulation and waterproofing, surveyed and installed by approved installers.
Read more → CountyCommercial Roof Waterproofing in County Antrim
Coverage across the whole of County Antrim.
Read more → AreasAll areas we cover
Every county in Ireland and Northern Ireland.
Read more → Free survey
Get a free survey in Lisburn
Tell us about the building and an approved installer covering County Antrim will be in touch.
- 20-year manufacturer-backed product warranty
- Free roof survey
- Approved installers across Ireland & Northern Ireland
Ireland & Northern Ireland
Other areas we serve
Approved installers cover Roof Waterproofing across Ireland and Northern Ireland. A few other locations near Lisburn: