Exterior Wall Cladding Materials Compared for Real Projects

Read this before the table

Two things make cladding comparisons misleading.

First, the system matters more than the material. The same board performs differently on a drained cavity than bonded to a wall. Settle the system question first — see ventilated facade vs direct-applied cladding.

Second, published figures vary enormously within a material family. “Metal cladding” spans 0.7 mm aluminium sheet and 3 mm composite panel. Any weight, cost or fire figure that is not tied to a specific product and thickness is decoration.

So the comparison below is on behaviour and constraint. Where a number would require a specific product, it is not given.

The candidates

Material	Relative weight	Exposure tolerance	Maintenance	Repairability	Main constraint
Brick / brick slip	Very high / low	Very high	Very low	Localised, matching is hard	Structural capacity; slip systems depend on fixing method
Natural stone	Very high	Very high	Very low	Difficult; batch matching	Weight, support system, cost
Fibre cement board	Moderate	High	Low–moderate (edge sealing, coating)	Panel-by-panel	Cut edges and fixing detail
Metal (sheet, cassette, composite)	Low–moderate	High	Low, but coating damage is visible	Panel-by-panel	Coating spec; fire classification varies by core
Timber	Low	Moderate — depends on species and treatment	High	Board-by-board	Movement, UV greying, recoating cycle
Render / EIFS	Low	Moderate	Moderate — cracks and recoating	Localised repair usually visible	Substrate movement; impact damage
Porcelain / ceramic panel	Moderate	Very high	Very low	Panel-by-panel	Support system; edge chipping in handling
High-pressure laminate	Low	High	Low	Panel-by-panel	Fire classification; thermal movement

Fire performance is deliberately absent from this table. It cannot be summarised by material family: it depends on the specific product, its core, the complete tested assembly, the building height and the jurisdiction. Treat it as a project-specific hard constraint to be confirmed, not a property to be looked up.

How to narrow the list

1. Apply the hard constraints. Fire classification for your building height and occupancy. Structural capacity for the weight. Any planning or conservation requirement on appearance. These are pass/fail and they typically remove half the list.

2. Apply exposure. Driving rain, UV intensity, freeze-thaw cycling, coastal salt. Then check that the fixings are specified for the same environment — fixings fail before cladding more often than the other way round.

3. Apply maintenance reality. Not what is theoretically possible, but who will actually do it and how they will reach it. Timber on a two-storey house with easy scaffold access is a different proposition from timber on a fifth floor over a public footpath.

4. Apply repairability. Ask what happens when one area is damaged. Panelised systems allow individual replacement. Continuous finishes such as render usually show the repair. Over a thirty-year life this matters more than most people expect at specification stage.

5. Then choose on appearance from whatever survived, including how the material weathers rather than only how it looks new.

Where each one is the wrong choice

• Brick and stone on a structure that was not designed for the weight, or in renovation without a verified capacity check.
• Timber where nobody has committed to a recoating cycle, or on elevations with high UV and no shading.
• Render over a substrate that moves, or where impact damage at ground level is likely.
• Metal where visible surface damage is unacceptable and the location invites it.
• Fibre cement where cut edges will be exposed and left unsealed.
• Any panel system where the support system was value-engineered out after the material was chosen.

The decision that gets skipped

Almost every cladding conversation starts with appearance and works backwards. That is why cladding decisions get reopened late, after the structural or fire constraint surfaces.

Running the constraints first is faster, even though it feels like the boring order. It also produces a shortlist you can defend when someone asks why the cheaper option was not used — which is a question that always arrives eventually.

Settle the system before the material — see the facades and exterior design guide and types of facade systems. Where weight governs, start instead with lightweight facade materials.