Seal a leaking commercial roof for a fraction of replacement cost. Complete GacoFlex silicone system from £15.50/m² fully installed — surveyed, coated and warranted by one team, without closing the building.
A Chertsey roof that has had patch repairs for years is a good coating candidate. Gaco S42 silicone goes over felt, asphalt, single-ply and metal alike once the substrate is checked, and SF42 covers the ponding areas.
You deal with one specification and one supplier: Duratite. The Chertsey application is done by manufacturer-trained approved contractors, and the roof is handed over with a 20-year manufacturer-backed product warranty.
From every Chertsey postcode outwards, Surrey is covered by one approved-contractor team. The same team covers Woking on the same visit schedule.
Real completed GacoFlex silicone installs by the Duratite approved-installer network — the same system we specify in Chertsey.
A tired profiled metal roof coated in place with Gaco S42 — no tear-off, no closure days, every seam, lap and fixing sealed under one continuous membrane. Real drone photography of a completed UK install.
Very few Chertsey roofs need replacing outright. Worn surfaces, open laps and failed detail work are surface problems, and a sound deck underneath means the waterproofing can be renewed in place without closing anything down. If the deck has gone, we will tell you that instead.
Leaks at laps, fixings or rooflights — but the deck still feels solid underfoot
Corroding or chalking metal sheets, or weathered asbestos cement
Ponding water that sits for days after rain
Replacement quotes that blow the maintenance budget
Tenants in occupation who cannot be decanted while the roof comes off
A complete GacoFlex silicone roof coating system in Chertsey typically costs £15.50 to £35 per m² fully installed — one figure covering materials and professional application. Roof condition, access and warranty length set where you land in the range.
| Complete system, fully installed | Typical installed price | Best suited to |
|---|---|---|
| GacoFlex system — 10-year specification | £15.50–£20 / m² installed | Sound roofs needing renewed waterproofing on a tighter budget |
| GacoFlex system — 20-year specification | £20–£25 / m² installed | Full film build for the 20-year manufacturer-backed warranty |
| GacoFlex system — complex roofs | £25–£35 / m² installed | Heavy preparation, chronic ponding, extensive seam & detail work |
| Full roof replacement (for comparison) | £80–£150+ / m² | End-of-life decks only — coating avoids this cost in most cases |
One system, one price. Every component below is part of the installed figure — none of them is ever priced separately.
You pay for the old roof twice in a replacement: once to remove and tip it, once to build its successor. Overcoating keeps the existing build-up as the base, so the bill covers the new membrane and the application, and nothing else.
That is also why the programme is measured in days rather than weeks, with no weather-exposed deck at any point.
Across 1,000+ UK commercial projects this system has renewed the waterproofing without removing the roof underneath, on asbestos cement, corroding profiled metal and ponding flat roofs alike.
The same roof, two very different routes. This is the comparison every Chertsey building owner should see before signing a re-roof order.
| What it means for you | GacoFlex coating system | Full roof replacement |
|---|---|---|
| Typical cost | £15.50–£35 / m² fully installed | £80–£150+ / m² |
| Time on site | Days — weekend phasing routine | Weeks of strip-off and rebuild |
| Disruption below the roof | None — the building stays live | Tenant disruption, decant costs and void risk |
| Waste to landfill | None — the existing roof stays put | The entire old roof, skipped and tipped |
| Weather exposure during works | Rain-resistant within hours | Open deck between strip and re-sheet |
| Warranty | 20-year manufacturer-backed product warranty | Varies by system and installer |
| When it’s the right call | Sound deck, worn-out surface — most roofs we survey | Genuinely end-of-life decks and structures |
Refurbish commercial flat roofs across Chertsey — offices, retail, mixed-use estate — without business disruption. Gaco S42 silicone seals flat and low-slope roofs in a single coat, backed by a 20-year manufacturer-backed product warranty.
Cold-applied Gaco S42 overcoats the existing roof in days, not weeks. Weekend phasing keeps tenants and operations live throughout — no tear-off, no skips, no closure days.
Backed directly by Gaco / Amrize on every approved-applicator install, and transferable if the building is sold.
Class A fire rating, solar reflectance up to 0.91, independently lab-tested for adhesion, elongation and UV stability.
Manufacturer-trained installers covering every Chertsey postcode. One team specs, supplies and supervises — a single point of contact end-to-end.
Four steps from first call to 20-year warranty. Most Chertsey roofs are surveyed within 2–5 working days and coated in days, not weeks.
A measured walk-over of your Chertsey roof with photographic condition record — core moisture checks where needed.
Same-week quotation with measured areas, system build-up (S42 or SF42), warranty term and programme.
Preparation first — clean, repair, prime — then a cold application by spray, brush or roller. Nothing is heated, and the coating shrugs off rain within hours.
Final inspection, then the 20-year manufacturer-backed product warranty is issued on completion.
The same stages every GacoFlex install goes through — real UK roofs, no renders and no stock photography.
Failed asphalt, ponding water and leaking details — the classic candidate roof. If the deck is sound, this is exactly the roof a coating rescues.
Cleaned, repaired and detailed first — seams, laps and fixings banded in silicone before any field coat goes on. This is the detail work the 20-year warranty depends on.
The finished S42 membrane — one seamless, ponding-water-rated surface, self-terminating around lanterns and upstands, with the manufacturer-backed warranty issued on completion.
Duratite specifies all three Gaco coating chemistries. Use this side-by-side to shortlist — the free Chertsey survey confirms the right build-up.
| Feature | Silicone · S42 / SF42 | Acrylic · Gaco 127 | Urethane · U91 / U92 |
|---|---|---|---|
| Best suited to | Flat & metal roofs with ponding water | Large reflective metal roofs, cool-roof projects | Pedestrian decks, plant rooms, trafficked areas |
| Ponding water resistance | Excellent | Poor | Very good |
| UV / weather resistance | Outstanding | Very good | Outstanding (U92 aliphatic) |
| Foot-traffic durability | Limited | Limited | Walk-on rated |
| Cool-roof / energy savings | High reflectivity (white) | High reflectivity (white) | Standard |
| Application | Single coat (S42) or fibre-reinforced (SF42), cold-applied | 2-coat, cold-applied, fast drying | 2-coat (base + top), cold-applied |
| Manufacturer warranty | Up to 20 years | Up to 15 years | Up to 20 years |
Real GacoFlex system installations — the same specification process and the same approved contractor network we deploy in Chertsey, led here by the roof types Chertsey actually has.
Original profiled metal roof coated in place with the GacoFlex S42 Series silicone system — no tear-off and no stripping of the existing sheets. Coating completed July 2025. Building owner Treveth Holdings LLP; installed by Gwella Contracting Solutions Ltd.
Failing bitumen felt roof with chronic ponding and leaking laps. The deck was confirmed sound on survey, so the roof was cleaned, detailed and coated in place with the GacoFlex S42 silicone system — no strip-off, seven days on site. Installed by J&M Coatings, Torquay.
Aged asphalt terrace leaking at parapets, outlets and skylight upstands — cleaned, detail-sealed and coated with GacoFlex S42 in two days, ready for decking over. Installed by J&M Coatings, Bournemouth.
Manufacturer-trained, Gaco-approved installers cover every Chertsey postcode and the wider Surrey region.
The GacoFlex silicone system suits any low-slope or profiled roof in Chertsey — typical Surrey jobs include:
Not sure which system your roof needs? A free survey settles it — call 01208 832 602.
Same GacoFlex system, same approved-installer network, across Surrey:
Every city page carries the same fully installed pricing and the same 20-year manufacturer-backed warranty.
Straight answers to the questions Chertsey building owners and facilities managers ask us most.
Yes. Duratite covers all of Chertsey and the wider Surrey area. Our manufacturer-trained approved contractors are mobilised across the region for free roof surveys and Gaco S42 silicone installations on commercial, industrial and agricultural buildings.
For most Chertsey postcodes we attend within 2–5 working days of enquiry. Urgent surveys can be arranged within 48–72 hours. Each visit includes a measured walk-over, photographic record and same-week written quote with no obligation.
Silicone roof coating in Chertsey typically ranges from £15.50 to £35 per m² supplied and installed, depending on roof condition, access, substrate and warranty length. A free site survey provides an exact figure with no obligation.
Yes — Gaco S42 silicone is the preferred encapsulation route for ageing asbestos cement sheeting on Chertsey commercial, industrial and agricultural buildings. It locks in fibres, extends roof life by 20+ years and avoids licensed-removal notification. Often eligible for Land Remediation Relief.
Yes. We routinely schedule Chertsey commercial roof coating works for weekends, bank holidays and out-of-hours periods so your operations and tenants are not interrupted. Gaco S42 is rain-resistant within hours, which makes weekend installs reliable even in changeable UK weather.
Gaco S42 carries a 20-year manufacturer-backed product warranty when installed by a Duratite-approved applicator in Chertsey. The warranty is transferable on sale of the building, and remains valid for the full term provided routine inspections are carried out.
Gaco SF42 is the fibre-reinforced silicone — choose it for Chertsey roofs with chronic ponding water, dished gutters or substrates needing extra crack-bridging. Gaco S42 is the standard single-coat silicone for general flat, low-slope and metal-roof refurbishment. The Duratite technical team confirms the right system on your free survey.
Gaco S42 white silicone reflects up to 85% of solar radiation. For Chertsey commercial landlords this contributes to improved EPC ratings ahead of the MEES 2027 minimum-rating tightening, where buildings rated below E cannot legally be let.
Yes. All Chertsey installations are carried out by Gaco-approved contractors with manufacturer training, full public-liability insurance, working-at-height accreditation and CSCS-qualified operatives. The 20-year manufacturer-backed product warranty is only valid when installation is completed by approved applicators.
Yes. The same approved contractor network that covers Chertsey works across the whole of Surrey, including Weybridge, Staines, Woking. One survey team, one specification, one 20-year manufacturer-backed product warranty — wherever the building is.
Installation is carried out by Gaco-approved contractors with manufacturer training, full public liability insurance and CSCS-qualified operatives. The products are supplied by Duratite Building Products Limited, and the 20-year product warranty is manufacturer-backed by Gaco (Amrize) — it is only valid when an approved applicator completes the install, which is exactly how every Duratite-managed project runs.
The national hub — systems, spec guidance and every city we cover.
Read more →ServiceThe full overview of Gaco commercial waterproofing — silicone, acrylic and urethane.
Read more →ServiceEncapsulate and waterproof an asbestos cement roof without removal — HSE-compliant, LRR-eligible.
Read more →ProductThe flagship silicone coatings behind every project on this page — spec sheets and trade pricing.
Read more →GuideWhat UK building owners actually pay, and what moves the price up or down.
Read more →GuideHow a reflective roof coating supports EPC uplift before the 2027 minimum-rating change.
Read more →Send your building details and a few photos. We confirm the right Gaco system and book your free Chertsey survey.
Tell us about your building and we’ll recommend the right system — foam, waterproofing or both — surveyed, specified and quoted at no cost.
We install Silicone Roof Coating across the UK. A few other locations our approved teams cover:
Not seeing your area? We cover all of the UK. Call 01208 832 602 for a free site survey.
