en flag
en flag
Extreme macro close-up of an aluminium window corner joint, framed tight from the right edge, studio side-lighting raking across the mitre weld to reveal profile depth and surface precision, powder-coat finish texture sharply resolved, no softening or atmospheric blur, industrial grey background
Extreme macro close-up of an aluminium window corner joint, framed tight from the right edge, studio side-lighting raking across the mitre weld to reveal profile depth and surface precision, powder-coat finish texture sharply resolved, no softening or atmospheric blur, industrial grey background
Request Technical Pack
— Aluminium Systems

Load-tested geometry. No on-site hand-holding.

Thermally broken aluminium profiles engineered for multi-storey exposure. Section geometry, U-values, and BS 6375 finish data published — so your specification stands before groundwork begins.

/ Published Performance Data

Specification built to withstand scrutiny

Thermal Performance
Structural Load Rating
Finish & Durability

No thermal compromise

Load-tested longevity

Coastal-rated durability

Profiles tested to wind load class C4 per BS EN 12210. Mullion and transom sections carry published deflection limits for façades up to 15 storeys without bespoke engineering sign-off.

Powder-coat and anodised options tested to BS 6375 salt-spray classification. Over 200 RAL colours available with Class 3 corrosion resistance confirmed before dispatch.

Thermally broken 70 mm and 90 mm frame depths. Published U-values from 1.4 W/m²K. Part L and EN 14351-1 compliant — data downloadable without a sales call.

Wide elevation view of an aluminium window profile section laid flat on a white studio surface, north-facing diffuse daylight from the left, the full frame depth and internal chamber geometry visible in cross-section, gasket grooves and thermal break polyamide strip clearly resolved, no hands, no staging, absolute geometric clarity
Wide elevation view of an aluminium window profile section laid flat on a white studio surface, north-facing diffuse daylight from the left, the full frame depth and internal chamber geometry visible in cross-section, gasket grooves and thermal break polyamide strip clearly resolved, no hands, no staging, absolute geometric clarity
View UPVC Systems
+ Installation-ready geometry

Section data that arrives before the profiles do

DXF and PDF section drawings for every profile series are available immediately on request. Frame depths from 55 mm to 90 mm cover curtain wall, commercial casement, and tilt-and-turn configurations.

Rebate dimensions, glass unit tolerances, and anchor-fixing centres are documented to contractor-ready standard — reducing RFI cycles and keeping your programme on schedule.

Also specifying UPVC? Castle's multi-chamber profiles share the same transparent data standard.

Request Technical Pack

Confirm system fit before your next tender deadline

The technical pack includes section DXFs, full U-value certificates, wind-load test reports, and current lead times — structured for direct inclusion in a specification document.