Industrial Cladding & Re-Cladding — Commercial roofing quotes

Industrial roof cladding is the covering that sits over the vast majority of the UK’s portal-frame estate: warehouses, distribution units, factories and retail sheds where the roof is a broad, sloped expanse of profiled metal rather than a flat membrane. It is the right call when you own or manage a large-span building on a steel frame and the existing sheets are corroding, leaking at the laps, or simply at the end of their coated life. A cladding specification is read from the purlin up, not from a price list, because the same 3,000 square metre warehouse can be re-covered three genuinely different ways, and the number on the page depends entirely on which one the survey justifies.

There are three broad routes, and knowing which one you are being quoted is the whole point of comparing industrial roof cladding quotes properly. Profiled steel or aluminium sheeting, in a built-up (twin-skin) system, lays an outer sheet, insulation and a liner over the purlins as separate components, and suits a re-clad where the existing liner is sound. An insulated composite (sandwich) panel bonds the outer skin, insulation core and liner into one factory-made unit, which goes down fast and gives a predictable U-value in a single fix. Over-sheeting, sometimes called over-cladding, fixes a new insulated outer skin over the existing roof on a spacer system without a full strip, where the structure can take the added load and the substrate is dry. Each has a place; none is a default.

The trigger is usually one of three things: a leak that reactive patching no longer holds, a corrosion problem visible from the yard as rust streaking down the sheets, or a planned-maintenance line that can no longer wait. Whichever it is, the honest first move is a survey that reads the deck, the loads and the drainage, so the quote is a specification you can defend to a board rather than a rate per square metre that moves the moment a contractor is actually on the roof.

Why choose industrial cladding over the other systems

Industrial roof cladding earns its place on a specific building type: the large-span, sloped, metal-roofed shed. Where your building is genuinely flat or shallow-pitch, a membrane is usually the better answer, and our commercial flat roofing page sets out where single-ply, felt or liquid win instead. Where the roof is a pitched slate or tile structure on a school, church or civic building, the covering is a different trade entirely, covered on the pitched and slate roofing page.

The sharper decision is between a full re-clad and the cheaper interventions. Where the sheets themselves are structurally sound and it is only the cut edges and gutters that have failed, a full re-clad is often over-specifying the problem. In that case a cut-edge corrosion coating or a gutter lining can buy ten to twenty years at a fraction of the cost, and the roof refurbishment and over-roofing route deals with the middle ground where an over-sheet is honest. The classic trap is a quote that prices a full strip when the actual fault is one failed gutter run — which is exactly why the whole roof should be surveyed before any one scope is priced.

A full re-clad is the right spend when the corrosion is through the sheet rather than at the edges, when the insulation is wet or absent, when the building needs a Part L thermal upgrade it cannot get any other way, or when the roof must be brought to a condition that will carry a solar array for the next 25 years. In those cases the capital is justified because it resets the whole roof, and the alternatives would spend the money twice.

Industrial roof cladding spec and sizing

An industrial cladding specification is built from the structure up and priced from a survey. Typical roof areas run from around 1,000 square metres on a single unit up to 20,000 square metres and beyond on a distribution shed, installed in roughly three to ten weeks depending on area and access, phased bay by bay while the building trades below.

The service life of a new insulated metal or composite cladding system is around 30 to 40 years, and the guarantee is a separate, finite figure worth asking about specifically: up to a 25 to 40 year manufacturer guarantee, subject to the system and approved-installer status. The strongest are single-point guarantees issued because a manufacturer-approved contractor fitted the system to specification, covering the coated sheet, the insulation and the workmanship. Ask for the term in years, exactly what is covered, and whether the cover survives any one firm ceasing to trade. Never accept anything described as a lifetime guarantee, because a guarantee is always bounded by a term.

On a full re-clad the U-value is typically upgraded to around 0.18 W/m²K to meet the Building Regulations Part L thermal-element requirement, achieved through the insulation thickness in the built-up or composite build-up. The fixing pattern is not a matter of habit: it is set by the wind-uplift calculation to BS EN 1991-1-4, which defines the fastener density across the field and the enhanced zones at the eaves, verges and corners where uplift is highest. On a profiled roof the minimum pitch is set by the sheet manufacturer, commonly down to around 1:40 for weathertightness, and the survey confirms the existing falls are adequate before any covering is specified.

The other decisions the survey settles are the rooflight replacement — old fragile GRP rooflights are a leading fall-through hazard and are almost always renewed as part of the works — and the fall-arrest or man-safe system designed into the roof so future maintenance is safe. A quote that omits rooflights and access provision is not a complete specification.

Compliance specific to industrial cladding

Industrial cladding carries an acute safety and thermal compliance load. Wind uplift to BS EN 1991-1-4 governs the fixing, because on a large sloped roof it is uplift, not gravity, that peels sheets away, and the calculation sets the enhanced fixing at the eaves, ridge and corners. A full re-clad that renews more than 50% of the roof surface is notifiable building work and triggers the Part L thermal-element upgrade, so the insulation must be brought up to current standards; the position is set out in the government’s Approved Document L (conservation of fuel and power).

Old profiled roofs are, in the language of the regulations, fragile roofs, and falls through them are a leading cause of construction fatalities, so fragile-roof precautions, edge protection and rescue planning under the Work at Height Regulations 2005 are mandatory — the HSE guidance on roof work and work at height is the reference. Any building from before 2000 must be surveyed for asbestos before intrusive work, since legacy asbestos-cement sheets and rooflights are common on older sheds. Ask whether each firm quoting is a member of the National Federation of Roofing Contractors (NFRC) and works to those standards; our guarantees page explains what to check on the guarantee.

Industrial roof cladding FAQs

Should I re-clad, over-sheet or just coat my industrial roof?

It depends on where the failure is. Coat where the sheets are sound and only the cut edges are corroding. Over-sheet where the outer skin is failing but the liner and structure are sound and can take the added load. Fully re-clad where corrosion is through the sheet, the insulation is wet, or the roof needs a Part L thermal upgrade. The survey reads the whole roof and gives you all three numbers, so the decision is made on evidence, not on whichever scope a contractor prefers to sell.

What does industrial roof cladding cost per square metre?

The real driver is the build-up the structure and U-value target demand, not the headline material, so a defensible figure comes from a survey. Gutter lining and cut-edge treatment, where they are the honest answer, are priced separately and are far cheaper.

Can a re-clad roof carry solar panels?

Often yes, and a re-clad is frequently the right moment to prepare for it. A ballasted or fixed array adds roughly 15 to 25 kg per square metre of dead load in typical conditions, more on exposed roofs, plus wind uplift, and sits on the roof for 25 years or more. Putting an array on a corroding roof means lifting it to re-clad underneath within a few years, so where solar is planned the right sequence is to re-clad first, then design the fixings so the roof is ready for PV.

How disruptive is re-cladding to a working warehouse?

Less than most owners fear when it is planned properly. Most re-clads are carried out bay by bay while the building trades below, with the noisier work phased to quiet periods, and temporary weather protection over each open bay. Working at height over a live building is managed under the Work at Height Regulations 2005 with fragile-roof precautions, edge protection and a rescue plan. A good quote sets out the phasing and the plan for keeping you operational.

Do I need Building Regulations approval to re-clad?

Usually yes for a full re-clad. Renewing more than 50% of the roof surface is notifiable and triggers a Part L thermal-element upgrade, so the insulation must meet current standards. Where the roofer is CompetentRoofer-registered, the work can be self-certified and a Building Regulations Compliance Certificate issued for your records instead of a separate Local Authority Building Control application — the document you will need at a sale, lease event or insurance review.

What is cut-edge corrosion and does my clad roof have it?

Cut-edge corrosion is rust at the sheet ends and laps of a profiled metal roof, where the protective coating is cut through in manufacture and the exposed steel corrodes first. If you can see rust streaking down the sheets from the yard, that is usually where it has started. On a roof whose sheets are otherwise sound it is treated with a specialist cut-edge coating rather than a full re-clad, which is far cheaper and far less disruptive, so the survey confirms whether the corrosion is only at the edges or has gone through the sheet before any re-clad is specified. Catching it early, at the cut edge, is one of the highest-value planned-maintenance decisions on a profiled roof, because it defers a capital re-clad by years for the cost of a coating.

Compare your industrial roof cladding quotes

If you are weighing up a re-clad, over-sheet or coating for a warehouse, factory or distribution unit, the honest first step is a survey of the deck, the loads and the drainage, not a rate over the phone. Use the quote form to compare the quotes you hold line by line, and ask each roofer to show how it will design the wind-uplift fixing, the Part L U-value upgrade and the access plan for your building. Compare the numbers properly against the cost guide and the repair or replace decision before you take an industrial roof cladding proposal to the board, and see how the guarantees actually work.