Aluminium Profiles (Windows & Doors)

Applicable Standard: Regulated under the KEBS Diamond Mark of Quality scheme for aluminium extrusions used in windows, doors, and curtain walling; profiles are assessed against internationally referenced wrought-aluminium-alloy and anodizing/powder-coating standards for wall thickness, temper, and finish durability.

Almost every aluminium profile sold into the Kenyan window and door market correctly uses the right alloy family — 6063-series is close to universal for architectural extrusions, so alloy identity is rarely where the real risk sits. The actual compliance failures are quieter than that: wall thickness shaved below the profile’s structural design minimum to save weight and material cost, temper (heat-treatment condition) supplied softer than specified so the profile machines and installs identically while carrying meaningfully lower yield strength, and anodizing or powder-coat finishes that don’t actually meet the coating thickness or salt-spray durability they’re marketed against. None of these show up in a showroom sample — they show up as flexing frames, hardware pull-out, or a coating that pits and chalks within a couple of years in a coastal installation. The market has also shifted meaningfully toward thermally broken profile systems (a polyamide insulating barrier between the interior and exterior aluminium faces, used to improve energy performance), and verifying that a thermal-break system is genuinely intact — rather than a cosmetic groove with no real insulating barrier — is a compliance question most buyers don’t know to ask until an energy-performance claim is challenged.

Why This Category Gets Flagged

The most structurally significant issue is wall thickness below the profile’s design minimum — visually identical extrusions with thinner walls that flex under load and fail hardware-retention testing (screw pull-out, hinge loading) in ways a showroom display is never subjected to. Second is temper mismatch — profiles supplied in a softer temper than specified (for example, T4 where T5 or T6 was called for), which machines and anodizes identically but carries meaningfully lower yield strength in load-bearing frame members. Third is finish durability shortfall — anodic or powder-coat thickness below the declared class, leading to premature chalking, pitting, or delamination well inside the stated warranty period, an issue that concentrates heavily in coastal and high-salinity installations where the finish is doing real corrosion-protection work rather than just providing colour. A fourth issue, particular to fabricated window and door systems rather than raw extrusion, is glazing bead and gasket incompatibility — rubber or EPDM gaskets sourced separately from the profile system that don’t seal correctly against it, leading to water infiltration and draughts that get blamed on installation workmanship when the actual mismatch is between two components that were never validated together.

Test Parameters

Labeling Requirements

Profiles and bundles must show manufacturer name/trademark, alloy and temper designation, profile reference number, finish type (mill finish, anodized, or powder-coated) and colour/class, and where relevant a coating warranty class. Window and door systems assembled from the profiles should carry a system data plate referencing the fabricator and glazing/hardware compatibility, since finish and structural claims made about a finished window are only as good as the profile-level testing behind them. Where a thermally broken system is specified, the data plate or accompanying documentation should confirm the polyamide barrier’s material and its own independently tested thermal-transmittance contribution, since a genuine thermal break and a purely cosmetic dividing groove can look identical to a site inspector but perform very differently in an energy-performance calculation.

Packaging & Documentation

Because wall thickness, temper, and coating quality are all effectively invisible without independent testing, this is a category where the paper trail behind a shipment matters as much as the extrusion itself:

Typical Gaps We Find

Wall-thickness and temper shortfalls are the least visible defects we find and, structurally, the most consequential — a profile that looks and installs exactly like the specified one but carries meaningfully lower load capacity, discovered only under standardized testing rather than site inspection. Coating thickness below the declared class on powder-coated profiles bound for coastal counties is a close second, and the one most likely to turn into a warranty dispute once salt-air exposure starts pitting the finish within a fraction of its stated service life. We also routinely find shipments arriving with a generic factory-type certificate rather than a mill or coating test certificate tied to the specific batch — meaning there’s no way to confirm any of the above without independent testing until a profile has already been fabricated into a window frame. Gasket and glazing-bead mismatch on assembled systems is another recurring finding, usually the result of a fabricator sourcing seals from a lower-cost, unverified supplier rather than the profile manufacturer’s specified system — a substitution that’s invisible on delivery and only becomes obvious the first time it rains against an installed window. Together, these findings point to the same underlying pattern: the extrusion itself is rarely the weak link in a failed Kenyan aluminium window or door — the weak link is almost always a downstream substitution or shortcut applied somewhere between the mill and the finished installation, which is exactly what batch-level documentation is designed to catch before it becomes a warranty claim.