Commercial roofing case studies
How real commercial roofs are surveyed, quoted and delivered across different systems. Representative scenarios are clearly labelled as modelled — we never present a modelled project as a named client.
The three commercial roofing projects on this page show how the same method, reading the roof from the deck up, produces very different specifications — and very different quotes — depending on the building, the fault and the loads. Before you read them, one honest note: these are modelled, representative scenarios, not named clients. This is a specifier and quote-comparison service that connects building owners with accredited installers, and rather than borrow someone else's photographs or invent a client list we do not have, we have set out three realistic projects that reflect the decisions a survey actually forces. Every figure in them — the falls, the Part L U-value, the guarantee term — is consistent with how work is specified; none is a claim about a specific past job.
Each study starts from the same place, a survey of the deck, the build-up and the load profile, and diverges on the evidence. Together they show the point this whole site is built on: that a headline price means nothing until the scope is fixed, and that the honest answer is often neither the cheapest quote nor the dearest.
Gutter lining solves a leak three sheet repairs could not
A manufacturing unit had an internal leak over a production line that had defeated three separate roof-sheet repairs. The survey found the sheets sound but a failed box-gutter joint carrying water behind the cladding — sealed with a cold-applied liquid lining at a fraction of the re-clad that had been quoted.
n/a (linear box-gutter run) m² · Cold-applied liquid gutter lining, whole box-gutter run
Read case study → Modelled scenarioA 1,600 m² school re-roof phased across the summer holiday
A 1970s concrete-deck teaching block had a cold-deck felt roof leaking into classrooms and showing interstitial condensation. An overlay would have hidden the condensation, so the roof was stripped to the deck and rebuilt as a reinforced-bitumen warm deck, phased around the school year.
1,600 m² · Reinforced-bitumen warm deck, tapered insulation, vapour control layer
Read case study → Modelled scenarioComparing three quotes on a 2,400 m² warehouse re-clad
A facilities manager held three commercial roofing quotes for a leaking profiled-metal warehouse roof that ranged from a £48,000 coating to a £310,000 full re-clad. On survey the sheets were sound but the valley gutters and cut edges had failed — so the three quotes priced three different scopes and only one fixed the actual fault.
2,400 m² · Over-sheet to insulated built-up cladding, plus gutter lining and cut-edge corrosion treatment
Read case study →What the three studies show
Comparing three quotes on a 2,400 m² distribution warehouse re-clad. A facilities manager held three quotes for a leaking profiled-metal warehouse roof, from a £48,000 coating to a £310,000 full re-clad. On survey the sheets were sound, but the valley gutters and the cut edges had failed — the leak was never the roof surface. The honest answer sat between the extremes: a gutter lining, cut-edge corrosion treatment and an over-sheet to a new insulated build-up at around £140,000, correcting the actual fault and adding a Part L U-value upgrade the coating would never have delivered, under a 25-year manufacturer guarantee. It ran about six weeks, phased and occupied throughout. The three quotes were never comparable because they priced three different scopes — this is the reference project for our whole industrial cladding and re-cladding approach.
A 1,600 m² school re-roof phased across the summer holiday. A 1970s concrete-deck teaching block had a cold-deck felt roof leaking into classrooms and showing interstitial condensation. An overlay would have left the condensation in place, so the roof was stripped to the deck and rebuilt as a self-adhesive reinforced-bitumen warm deck with a vapour control layer, tapered insulation to a 1:80 finished fall, and a 0.18 W/m²K Part L upgrade. Cold-applied layers removed naked-flame hot-works risk over an occupied school, and the noisy work was phased across the summer holiday and evenings under a 20-year manufacturer guarantee. It is a representative commercial flat roofing re-roof, self-certified by a CompetentRoofer-registered installer with a Building Regulations Compliance Certificate.
A gutter lining solves a leak three sheet repairs could not. A manufacturing unit had an internal leak over a production line that had defeated three separate roof-sheet repairs. The survey found the sheets sound but a failed box-gutter joint carrying water behind the cladding line. A cold-applied liquid gutter lining sealed the whole gutter run to its outlets in under a fortnight, at a fraction of the cost of the re-clad that had been quoted, and the leak stopped. The lesson is the one this site keeps returning to: on a big industrial roof, survey the whole roof, because the drip is rarely under the stain — and the cheapest correct scope is often the one no other quote offered.
Read the how it works page for the survey-to-sign-off method behind all three, or the repair, refurbish or replace page for the decision each one turned on. For a costed condition report on your own building, request a quote.