ACM composite panels and metal panel siding look simple until the reveal joints go uneven or the face starts to ripple. Rainscreen framing, reveal layout and panel attachment installed by the same in-house Red Seal crews that build the roof above it.
ACM stands for aluminum composite material: two thin aluminum skins bonded to a solid core, cut and folded into flat panels with narrow reveal joints between them. Ribbed and corrugated metal panel siding is a different product entirely, a rolled steel or aluminum profile with a visible rib pattern. Both get specified for how clean or how industrial they look. Both fail the same way when they get installed like siding instead of like the engineered system they actually are, with no air gap behind the face and no plan for how the panels move.
Thin-gauge panels installed without enough attachment points, or fastened rigidly with no room to expand, ripple and wave in direct sun. It is the single most common complaint on a flat-panel job.
A panel installed tight to the wall with no open air gap traps whatever moisture gets past the joints. A true rainscreen assembly lets that moisture drain and dry instead of sitting against the sheathing.
ACM cores are not interchangeable. A polyethylene-core panel used where a fire-retardant mineral-core assembly is required is a code problem, not a cosmetic one, and it is decided at the specification stage, not on site.
Panel problems usually show up at the joints and the face long before there is any structural issue. Walk your building or home once a season, especially after a hail storm or a stretch of hard sun, and look at the seams and the flatness of the panel face.
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A panel job lives or dies on the layout: reveal spacing, attachment points, and where the panel-to-roof and panel-to-window junctions land. Get the layout wrong and no amount of careful cutting fixes it later. Because our in-house Red Seal crews build both the roof and the exterior, those junctions are handled by one accountable team instead of being split across trades. Backed by COR safety certification and $10M liability coverage.
From a full ACM rainscreen facade to a single ribbed-metal accent band, every panel is laid out, framed and installed in-house by our certified crew.
Flat aluminum composite panels, two thin aluminum skins bonded to a solid core, installed as a true rainscreen with an open air gap behind the panel face. This is the modern commercial-facade look: dead-flat panels with crisp, narrow reveal joints, not a corrugated or ribbed profile.
A different product from ACM: rolled or ribbed steel and aluminum panels with a corrugated or trapezoidal profile, often paired with wood accents. It reads as industrial or modern-farmhouse rather than the flat commercial look of ACM.
The detailing that decides whether a panel job looks crisp or looks cheap: consistent reveal widths, straight window and door surrounds, and corner and edge trim that closes off the panel system cleanly instead of leaving raw edges exposed.
Metal panel used as a deliberate accent band alongside wood, stone or siding rather than covering the whole envelope. It is one of the most common ways we bring a panel look into a residential exterior without the cost of a full commercial-style re-clad.
It depends entirely on the core, and this is where ACM gets misunderstood. Aluminum composite panels are made with different core fills: some use a solid polyethylene (PE) core, others use a fire-retardant (FR) core with a mineral filler that resists ignition and slows flame spread. The aluminum skins themselves do not burn, but a PE core behind them can contribute to a fire if the wrong assembly is used on the wrong building. Code requirements around panel core type, building height and occupancy exist for exactly this reason, and they are not optional details.
PE-core and FR-core panels can look identical on the wall. The difference is entirely inside the panel, which is why the spec sheet matters more than the sample chip.
Building height, occupancy and proximity to property lines all factor into what core and assembly the Alberta Building Code allows. We specify to that requirement, not to whichever panel is cheapest.
Fire performance is tested as a full wall assembly, panel, attachment and air gap together, so swapping one component after the fact can invalidate the rating the design relied on.
This is general information on how ACM panel systems are categorized, not a substitute for a project-specific code review. For any commercial or multi-family application, core type and assembly should be confirmed against the current Alberta Building Code and your local authority having jurisdiction before panels are ordered.
These three cladding families solve different problems. Most projects we quote end up using panel as a deliberate accent alongside a primary cladding rather than covering the whole envelope in it.
Modern commercial look
Dead-flat aluminum skins over a solid core, with narrow reveal joints and a true rainscreen air gap behind the face. It is the cleanest, most contemporary look available and it takes Calgary UV and freeze-thaw well when the core and attachment are specified correctly. It costs more than siding and is usually seen on commercial facades and higher-end residential feature walls.
Industrial & farmhouse
Rolled steel or aluminum panels with a visible ribbed or trapezoidal profile. Tougher against surface hail marking than a flat panel because the ribs break up the flat plane, and a strong fit for the industrial-modern or farmhouse look that has become popular on Calgary infill and acreage homes.
Full-envelope cladding
For covering an entire home, fibre-cement siding is usually the more practical and economical choice, with panel or metal reserved for an entry, a gable or a feature band. See our Hardie siding page for the full comparison.
Lifespans assume a correctly specified core, a real rainscreen air gap and attachment sized for the panel gauge, which is the engineering you cannot see from the ground and we never skip. Oil-canning and wet-seal failure are almost always attachment or layout problems, not a sign the panel material itself has failed. Relative material cost compares these materials to each other, not a quote for your project. Your price depends on size, access and what we find underneath.
Panel work rewards planning more than any other exterior system. Here is exactly what to expect.
We inspect the wall assembly, sheathing and existing cladding, and confirm what the substrate needs before a panel system goes over it.
ACM or ribbed metal, panel gauge, core type and PVDF colour, chosen for the look you want and the code requirements of the wall.
We lay out the rainscreen framing, reveal-joint spacing and panel sizing on paper first, so seams land where they should, not where they happen to fall.
Sub-framing and the open air gap go in behind the panel face, the part of a rainscreen system that never shows but decides whether it performs.
Panels, trim and reveal joints installed by in-house crews, then a walk of every elevation with you before we call it done.
ACM stands for aluminum composite material: two thin aluminum skins bonded to a solid core, cut and folded into flat panels with narrow reveal joints between them. It is the dead-flat, crisp-joint look you see on modern commercial facades, installed as a rainscreen system with an open air gap behind the panel face.
ACM is a flat composite panel, two aluminum skins over a core, with narrow reveal joints. Ribbed or corrugated metal panel siding is a different product, a rolled steel or aluminum sheet with a visible rib or trapezoidal profile. ACM reads as flat and modern-commercial; ribbed metal reads as industrial or farmhouse. They are installed differently and are not interchangeable.
It depends on the core. ACM panels are made with either a polyethylene (PE) core or a fire-retardant (FR) mineral-filled core, and building height, occupancy and code determine which is required. The aluminum skins do not burn, but a PE-core panel used where an FR-core assembly is required is a code problem. We specify core type to the requirement, and any commercial application should have core and assembly confirmed against the Alberta Building Code.
Oil-canning is the rippling or waving you see on a flat panel face in direct sun. It usually comes from panels that are too thin-gauge for their span, too few attachment points, or fastening that leaves no room for the panel to expand and contract. It is prevented at the layout and attachment stage, not by anything done after installation.
Well, when specified and installed correctly. PVDF-finished aluminum skins resist UV fading far better than ordinary paint, and a properly detailed rainscreen air gap lets moisture drain and dry instead of freezing behind the panel. Ribbed metal panels are also fairly hail-tolerant because the rib pattern breaks up the flat plane. Most failures we see trace back to the installation, not the material.
Both, though most residential uses we install are a deliberate accent, an entry feature, a gable or a band alongside siding, rather than the whole envelope. Full ACM facades are more common on commercial buildings. Ribbed metal panel siding is used both ways, as full cladding on modern or farmhouse-style homes and as an accent on more traditional ones.
Through a rainscreen assembly. Sub-framing goes over the wall first to create an open air gap, then panels are attached with a wet-seal system (sealant at the joints) or a dry-joint system (mechanical extrusions that do not rely on sealant). Dry-joint systems generally need less long-term maintenance because there is no sealant to fail, but both work when the layout and attachment are engineered correctly for the panel gauge and span.
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