Skylight systems endure severe multi-directional structural forces, including the dead load of heavy triple-glazed insulated glass units (IGUs), live maintenance access loads, snow loads, and wind uplift pressures. The 6063-T6 temper undergoes artificial precipitation hardening (ageing at elevated temperatures), yielding a minimum tensile strength of 205–214 MPa and a yield strength of ~170 MPa, compared to T5 temper (~145 MPa yield). Utilizing 6063-T6 for skylight rafters and transoms prevents long-span deflection beyond the standard L/175 limit, preserving structural integrity and protecting glass perimeter seals against stress cracking.

Aluminium possesses high thermal conductivity (~200 W/m·K), which creates a thermal bridge between cold outdoor ambient air and warm indoor humid air. Without thermal isolation, the interior surface of the frame drops below the dew point temperature, triggering condensation that drips down onto ceilings and finishes. Pak Alumex inserts PA66 GF25 polyamide strips (reinforced with 25% glass fiber, thermal conductivity ~0.3 W/m·K) mechanically crimped between inner and outer extruded aluminium profiles. This thermal barrier restricts heat flow, elevating internal surface temperatures, lowering overall window U-values to 1.1–1.4 W/m²K, and permanently preventing condensation formation.

Because overhead skylights face direct, unshaded solar radiation and weathering, surface coating selection is critical. For coastal, saline, or tropical environments, we recommend Qualicoat Class 2 Superdurable Architectural Powder Coating applied at 60–80 microns over chromate-free zirconium conversion pre-treatment, or 20–25 micron Anodizing. Anodizing electrochemically integrates an aluminum oxide film directly into the metal surface, rendering it completely immune to filiform corrosion, peeling, and UV degradation under harsh outdoor conditions.

Our engineering division accepts client CAD drawings (DWG/DXF) or physical profile samples. We evaluate key geometric parameters including wall thickness uniformity, moment of inertia (Ix, Iy), thermal break cavity dimensions, and assembly tolerances. Once approved, we manufacture precision H13 tool-steel extrusion dies, run trial extrusions at our Faisalabad plant, and dispatch first-article samples alongside chemical and mechanical lab test certificates before initiating mass production runs.

Low-pitch skylight installations (under 15°) present challenging water shedding dynamics. Pak Alumex skylight profile systems employ a multi-tier pressure-equalized drainage design. High-grade EPDM gaskets provide a primary compression weather-seal against the glass unit. Any water penetrating this barrier is collected in continuous internal secondary drainage gutters extruded into the rafters and transoms, which guide water out through baffled weep holes equipped with non-return valves. This engineering approach guarantees water tightness up to 750 Pa pressure differentials under continuous water spray testing.

Standard architectural skylight profiles in catalog dies carry flexible minimum order quantities starting at 500 kg per section, while custom die development orders typically start at 1,000 kg. Die manufacturing requires 10 to 14 days, with sample production and testing taking an additional 5 days. Upon sample sign-off, bulk production and surface finishing are completed within 14 to 21 days. Orders are then wrapped, crated, and dispatched to Karachi port for ocean freight delivery to destination ports worldwide.