W50 TB
A 1.5 mm precision cold-rolled zinc-magnesium alloy steel profile, single-pass formed and bonded with a polyurethane thermal break — engineered to reach passive-house standard with triple glazing.
Performance
Heritage face.
Modern envelope.
W50 TB carries the proportions of a classic FerroFinestra window — a slim 59 mm sightline, the same stepped reinforcement leg, the same crisp shadow gap — and pairs them with a polyurethane thermal break engineered specifically for steel.
Anatomy
The profile,
broken thermally.
1.5 mm zinc-magnesium alloy steel cold-rolled in a single pass — denser and more corrosion-resistant than standard cold-formed steel.
-
01.
Swiss-imported zinc-magnesium alloy steel — superior corrosion resistance.
-
02.
1.5 mm precision cold-rolled, single-pass forming for dimensional stability.
-
03.
59 mm external sightline — the slimmest thermally broken steel face in its class.
-
04.
Polyurethane thermal break engineered specifically for steel.
-
05.
Classic stepped reinforcement leg — the FerroFinestra signature, retained.
-
06.
18 mm glass rebate, 50 mm depth — accepts triple-glazed IGUs.
-
07.
Integrated drainage structure cast into the section.
-
08.
16 mm controllable space between frame and sash for service and resealing.
-
09.
Compatible with concealed tilt-and-turn and inward-opening hardware.
-
10.
UK Police-recommended security grade · fire-rated installations available.
Configurations
Nine Ways
to open a wall.
From the smallest top-hung casement to oversized pivot doors and folding glass walls — every standard configuration architects specify.
Glazing Beads
Four profiles
of detail.
The bead is the smallest line in a steel window. W50 TB ships with four profile options.
Finish
Natural steel.
Or any color.
Powder Coat — in any RAL.
A multi-stage powder-coat system applied through Tiger Coatings — BlackFramed's certified European finishing partner. Any RAL standard, any custom matched color. Matte, satin, or texture finishes available. Applied over a phosphate-passivated zinc-magnesium substrate — warrantied against fade, chalk, and adhesion failure.
Specified Palette — a starting point.
Six colors we recommend for W50 TB envelopes — from RAL 9005 Jet Black for contemporary façades to Off White for historic adaptive reuse. Any RAL is available on request; samples are produced in 100 × 100 mm panels and delivered with the project documentation pack.
vii. Specification
Specify W50 TB.
Whether you're an architect, builder, or homeowner, we'll review your project and prepare a custom quotation, preliminary specifications, finish options, and expected lead time.
Start a Project
Tell us about your project.
A few details and we’ll be in touch.