Choosing a Renovation Cladding: Metal Carved Panels Against the Four Alternatives

Most villa and resort renovations start the same way: four quotations arrive, and none of them measure the same thing. One prices material per square metre, one includes labour, one is for a system that does not insulate, and one quietly assumes the old facade comes off first. Put them side by side and the cheapest number usually belongs to the option that leaves most of the work to somebody else.

That is the comparison problem worth solving before the specification is written. Below is how the five realistic options behave on the criteria that actually decide a renovation, and — just as usefully — where a metal carved panel is the wrong answer.

The five options, and what each one actually delivers

On an existing building in Southeast Asia the shortlist is usually: re-tile or re-stone, aluminium composite panel (ACP), paint or textured coating, a thin-coat external insulation system (EPS or rock wool plus render), or a metal carved insulated panel.

They differ on five things that matter far more than the unit price.

Weight. A 16 mm metal carved panel is 3.7 kg/m² — about a tenth of stone or ceramic tiling at 30–60 kg/m², and light enough that a full 4,000 mm panel is a one-person lift at 5.7 kg. On an older structure that is the difference between re-cladding and a structural assessment.

Wet or dry. Tiling and render are wet trades: mixing, curing, and a weather window between coats. Panels are fixed dry with a starter track, self-drilling screws and interlocking edges, so there is no water on site and no interval waiting for anything to set.

Whether insulation is included. Paint and ACP insulate nothing. An EPS or rock wool system insulates but still needs a decorative finish on top. A metal carved panel arrives as the finished face and the insulation in one element, laminated in a single pass.

What happens to the old wall. Every option except the panel assumes demolition, or at least extensive preparation. Over-cladding leaves the existing wall in place.

Time to first repaint. Coatings are the cheapest line on the quotation and the most expensive over twenty years.

Figures for the alternative systems are industry ranges given for orientation and are drawn from the producer's own comparison material — they are not a quotation basis. Confirm any of them against your local supply before you commit.

Where the panel is the wrong choice

This is the part most supplier pages leave out, and it is where projects go wrong.

Fire-critical buildings. The core is rigid PU, classified B1 to GB 8624. That is not a non-combustible A class. For high-rise, hospitals, schools, or anything under a European specification calling for A2, the answer is a rock wool core — which this production base does not currently run. Raise it at enquiry rather than at design review.

Local fire approval is not the same as a fire class. The classification is supported by a CNAS/CMA-accredited laboratory report (CTICM2102162526523ABR, issued 23 June 2024). Whether your authority accepts it is a separate question. There is no CE marking, UL listing, EN 14509, ASTM, SABER or CodeMark held on this product — schemes such as CE under CPR 305/2011, ASTM E84 or UL 723, SASO/SABER, EAC and CodeMark must be confirmed against your market before the container ships, not after it lands.

Exposed coastal and high-UV sites. The standard finish is an 11-layer polyester system (six coats face, five reverse) on aluminium-zinc coated steel. It is not PVDF. On an open beachfront or at altitude, polyester chalks sooner than the same panel inland. If your specification calls for PVDF or SMP, say so at sampling — it is a different production route and a different price.

A substrate that cannot hold a fixing. Direct fixing works on sound masonry, rendered, concrete and previously painted walls. It does not work on friable or chalky surfaces, unreinforced aerated concrete block, or walls with extensive hollow or delaminated areas. Over-cladding hides a drummy wall; it does not repair it. Where the substrate is doubtful, the correct answer is a framed system — C-section main rails at 1,200 mm centres or less, U-section secondary rails at 380 mm.

A U-value set by code. A 16 mm panel is decorative cladding that also insulates; it is not a code-compliance device on its own. Measured conductivity is 0.022 W/(m·K) at 10 °C and 0.024 W/(m·K) at 25 °C (GB/T 10295-2008), with a system heat transfer coefficient of 1.50 W/(m²·K) (GB/T 13475-2008). If your project has a mandated U-value, model the whole wall build-up and check it before ordering.

Material price. Per square metre of material, paint wins. The case for the panel is installed cost — labour, no demolition, and insulation you would otherwise buy separately. Sell it on that comparison and it holds; sell it on material price and it does not.

The specification, stated plainly

Programme and access

On the producer's own comparison, 100 m² of wall is clad by a two-person crew in three to five days; ceramic tiling on the same wall takes four people ten to fifteen days. In practice the useful number for a resort is the phase, not the total — one elevation or one wing at a time keeps the rest of the rooms sellable, and because the work is dry there is no gap between trades waiting for mortar to cure.

Two things over-cladding does not remove. Access is still needed above the first floor, and the sealant stage still needs a dry joint — in a monsoon that means sequencing sealing ahead of the afternoon storm rather than leaving it to the end of the day.

At 4,000 mm the panel and its carton are long. Check site access and turning space before delivery, and note that container utilisation is governed by volume, not weight: roughly 1,300 m² to a 20GP, 2,600 m² to a 40GP and 4,360 m² to a 40HQ of 16 mm panel. A 20GP takes only one row of cartons lengthwise, so the short container is the poor value of the three.

What actually moves the price

Two corrections worth having in writing before you compare quotations. There is no volume tier on panel price — the mill price is set by steel gauge and core thickness, not by how many containers you take. And a quotation that comes in well below the field has usually been built by moving one of those first two variables; ask for the calliper figure and for the mill's batch policy on colour, so one elevation comes out of one production run.

Commercial terms are straightforward: ex-works from the production base in Zouping, Shandong, or FOB Qingdao, packaging included. Minimum order 500 m² — about 330 standard panels. Production for one container is 15 days, and quotations carry a fixed validity window because steel and MDI move. Chinese export declaration uses HS 7308.90.00; your import duty treatment is set by your own customs authority and is worth confirming before you model landed cost.

Questions buyers ask

Is a metal carved panel cheaper than tiling? Not on material alone — paint wins that comparison, and tiling may too. The comparison that holds is installed cost per square metre: labour, the demolition and disposal you avoid, and the insulation you would otherwise buy separately.

Can panels go over existing tiles? Yes, where the tiling is soundly bonded and the surface is flat to 3–4 mm over a 2 m straightedge. Hollow or drummy areas should be cut out first — over-cladding conceals the defect, it does not fix it.

How long does the finish last? The producer's literature quotes 45–50 years structural service life and 15–20 years coating colour fastness. Both assume the coating is matched to the exposure; standard polyester on an open beachfront will chalk sooner than the same panel inland.