Sectors
Flat Roofing for Industrial & Warehouse Buildings
Production halls, distribution warehouses, logistics sheds and trade counter units share a roof problem the rest of the built environment does not: enormous areas, almost no one looking at them, and a leak landing on stock, machinery or a working floor. This page sets out how we approach them.
Book a surveyOr call us on 07593 196505
Big simple fields, mapped rather than paced
The defining feature of an industrial roof is scale without complication: hundreds or thousands of square metres of largely uninterrupted covering. Walking that methodically takes time, and time on a roof is the reason large fields get inspected less often than they should. Aerial imaging changes the arithmetic. Flown as part of a condition survey, a drone records the whole field from above in one pass, making the slopes, the pools that sit after rain, debris build-up and damaged areas visible as patterns rather than as isolated photographs.
The imaging tells us where to concentrate; it does not do the inspecting. Whether the covering is still stuck down has to be tested by hand, soft areas felt for, and moisture read through the layers before anyone can say what the roof is worth spending money on. The aerial record and the physical inspection go into the same report, and the report says which finding came from which.
Weak points
Plant, penetrations and rooflights: where the water gets in
The interruptions
On a building this size the membrane rarely fails in the open. It fails at the interruptions, and industrial roofs are full of them: extract and air handling units on frames, refrigeration pipework, cable trays, gas and service penetrations (pipes and ducts through the roof), and long runs of rooflights whose kerbs (their raised frames) and edges age faster than anything around them. Those runs are the other hazard up there: an aged rooflight will not carry a person, so we treat them as fragile until proven otherwise and work round them on a planned route rather than stepping over them. Add the vibration of plant, the traffic of anyone servicing it, and the debris that collects against every turned-up edge, and the pattern of an industrial leak becomes predictable.
What the field itself is made of decides the rest. A unit of this age is usually either profiled metal sheet, where the fixings and the cut edges go before the panels do, or a single ply membrane whose welds and flashings are the first thing a survey opens up.
The systems that answer it
That is where the systems earn their place. Torch-on felt gives the field a robust, repairable covering. Cold-applied liquid waterproofing handles the geometry sheet membrane struggles with, and keeps flame away from rooflights, cladding junctions and anything combustible under the Safe2Torch discipline. Straight talk on systems is part of the job: Torch-on felt and the HYDRONYLON liquid system are what our own crews lay, while the surveying and the advice cover every flat roof system in use, and the profiled metal or single ply already on the building is repaired and overlaid rather than left to somebody else. Where your building would do better on a system outside what we lay, the report says exactly that.
One material stops the job dead. Plenty of older units and yard buildings are still sheeted in profiled cement, and on a building of that vintage asbestos is a live possibility. No crew of ours cuts, lifts or drills it. You hear that the moment we see it and again in writing, no quotation from us includes touching it, and what the sheeting actually contains is a question for a laboratory rather than a judgement anybody makes from a ladder. Getting it off the roof belongs to an asbestos contractor, trained and equipped for it, working under the Control of Asbestos Regulations.
On site
Working on a site that is running
Refurbishing one of these roofs over the sheets already up there is described on its own page. Industrial sites have rules, and they exist for good reasons. Yard traffic, loading bay schedules, shift changes, restricted zones, permit-to-work systems for roof access and hot works: all of it is agreed before a date is booked, not negotiated on the morning. Method statements and risk assessments go in ahead of time, permits are signed before work starts, and any hot works are controlled and closed out the same day. Where a phase genuinely will be disruptive, you hear that at the planning stage rather than discovering it. How a programme is actually built around an operation, section by section, is described on roof works over a trading site.
Programme
Programmes across units and estates
South-east London keeps most of its sheds in a few places, which makes them easy to programme together: the trade estates along the Erith and Crayford riverside, and the older industrial pockets around the Cray Valley, are typical of what a single schedule can cover in a day.
Multi-unit estates and logistics parks reward planning more than almost any other building type, because the roofs are similar in age and construction and fail in similar ways. A planned maintenance programme keeps outlets and gutters clear before winter, catches small splits while they are cheap, and produces a dated record per roof, which is what supports guarantee compliance and what makes a capital plan defensible. Between visits, isolated failures are handled as flat roof and leak repairs, with the same record keeping.
The wider approach, reporting standards and the way we work in occupied buildings are set out on the commercial flat roofing hub. Capital work on a spent roof goes through refurbishment and overlays or replacement.
Questions
Frequently asked questions
Can you survey a large warehouse roof quickly?
Yes, and this is where aerial imaging pulls its weight. A drone maps a big uninterrupted field in a fraction of the time it takes to walk it, showing slopes, standing water and debris from above, while the physical inspection concentrates on the details that decide everything: seams, upstands, plant bases and outlets.
Do you install single ply on industrial roofs?
No, and we would rather say so than pretend otherwise. We install torch-on felt, also called reinforced bituminous membrane, and liquid-applied waterproofing. The single ply already on your building is a different matter: that we survey, repair and, where the substrate suits it, renew with a liquid overlay. Only a brand new single ply roof goes elsewhere, to an installer the membrane manufacturer has approved, and the report says so plainly when that is the right answer.
How do you work around production and deliveries?
By agreeing the constraints before anything is booked. Access routes, yard movements, shift patterns, permit-to-work systems and any hot works controls are settled in advance, and work is sequenced so the parts that affect operations happen when they cost you least.
Why do industrial roofs leak around plant and rooflights?
Because those are the only places the membrane is interrupted. Every extract unit, service penetration, cable tray support and rooflight kerb is an edge that has to be detailed, and edges are where movement, debris and standing water concentrate. A survey of an industrial roof is largely a survey of its interruptions.
Can several units on one estate run under one programme?
Yes. Each roof is surveyed and recorded on its own, then priorities are compared across the estate so budgets and visits can be planned as a whole. Pricing follows the same rule as everywhere else: a survey first, then a written figure for each roof and for the portfolio as a whole, never a rate guessed off a site plan.
Got a roof nobody has looked at in years?
That describes most industrial roofs. Tell us the size, the location and how the site runs, and we will start with a survey.
We need a little more before we can send that: a name, the postcode of the roof, what is happening with it, and either a phone number or an email address.
Sorry, that did not send. What you wrote is still here, so press send again when you have a signal. If it will not go, ring 07593 196505 or email office@pluvian.uk.
That has come through a few times already. If the first one did not arrive, ring us instead or email office@pluvian.uk and we will pick it up from there.
Coming out and pricing the work is free; a written condition survey carries a fee, agreed before the visit and taken off the price of the work if you go ahead.