Steel swing and French doors, fabricated to the opening
Steel swing and French doors with slim sightlines, thermal ratings, and a double. One source for every opening in the building.
The Detail That Matters
Where the French door is won or lost
On a single swing door the sightline reads at the jambs. On a French door it reads at the center, where the two leaves meet. That doubled meeting stile is what the architect, homeowner, and installer notices first. The OTTOSTUMM W20 holds 1.5". The Jansen Janisol Arte 2.0 holds 1.6" on a thermally broken system. Steel keeps that center stile narrow where aluminum cannot.
The meeting point is the seal
On a French pair, the joint between the two leaves is the classic path for air and water. Studio Steel French doors carry a welded steel astragal. The inactive leaf has a steel tube welded to it, then a second tube carrying the weather seal welded to it. The active leaf closes against the seal. Fabricated steel does the sealing, with no applied strip to peel or fail.
Heavy steel that stays true
Steel doors are fabricated to tolerance and prepped for hardware rated to carry the leaf. The door that swings true on installation swings true years later. The dimension confirmed in the approved CADs is the dimension that holds.
One family across every condition
A whole-house specification mixes interior and exterior, solid steel and thermally broken, single leaf and French pair. The W20 wine cellar door and the W50 TB terrace door come from the same fabricator, the same finish line, and the same hardware program. The sightline language and the finish stay consistent across openings that serve completely different functions.
True steel construction
Studio Steel swing and French doors are fabricated from true steel profiles across five systems: OTTOSTUMM W20, W40, W50 TB, and W75 TB, plus the Jansen Janisol Arte 2.0. The W20 and W40 are solid steel; the W50 TB, W75 TB, and Jansen systems are thermally broken for projects where the energy code requires it. The W20 holds a 1.5" sightline, the W40 a 1.5" sightline, the W50 TB a 2.0" sightline, and the Jansen system a 1.6" sightline; W75 TB available on request.
A three-stage finish, 200 microns
Every Studio Steel door goes through a three-stage finish process before it ships. Profiles are abrasive-blasted to Sa2.5 grade, then phosphate-treated to reduce surface reactivity. A cathodic e-coat layer, epoxy resin at approximately 30 µm, is applied uniformly across all surfaces including internal geometries. Electrostatic powder coat follows at approximately 180 µm using TIGER powder, baked at 200°C. The topcoat is a PPG Tetrafluoro fluorocarbon, UV-stable and weather-resistant. Total system thickness is approximately 200 µm. Salt spray resistance exceeds 1,000 hours. Custom colors are available.
Sealed at the factory
Weatherstripping, threshold, and seal details are confirmed at the CAD stage and fabricated into the door assembly before it ships. The door arrives ready to install, not ready to be adjusted. On French door configurations, the center astragal is fabricated as part of the assembly.
Another USP
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All five Studio Steel profile systems are available for swing and French door configurations.
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Solid Steel Vs Thermally Broken
All five Studio Steel profile systems are available for swing and French door configurations.
| Specification | Ottostum W20 | Ottostum W40 | Ottostum W50 TB | Ottostum W75 TB | Jenson Janisol Arte 2.0 |
|---|---|---|---|---|---|
| Profile Type | Hot rolled solid steel | Hot rolled solid steel | Thermally broken | Thermally broken | Thermally broken |
| NFRC Ratings | Contact for details | Contact for details | U 0.26-0.35 | Coming soon | NFRC certified - values on request |
| Tile 24 | No | No | Ratings only | Coming soon | Ratings only |
Specifying solid steel, W20 and W40
Interior and exterior openings where thermal performance is not a code requirement: wine cellars, pantries, courtyards, covered entries, and historic renovation projects. The solid steel profiles deliver the narrowest possible sightlines in a non-thermal assembly. The W20 is recommended for Mills Act projects.
When to specify thermally broken, W50 TB, W75 TB, Jansen
Any project where NFRC-rated performance is required for the energy calculation, typically conditioned exterior openings under Title 24 or comparable codes. U-factors as low as 0.26 on triple pane configurations.
Project types where a swing or French door is the right specification for the opening.
Primary exterior entry where the door is the first architectural statement. Single swing or French door, inswing or outswing, composed with sidelites and transoms to the full opening.
The W20 and W40 hot-rolled solid steel profiles suit projects where thermally broken assemblies would conflict with historic approval requirements. The W20 is recommended for Mills Act projects.
Pantries, wine cellars, home offices, and bedroom entries where the swing door manages circulation and the steel profile delivers the aesthetic without a thermal requirement.
Hotel entries, restaurant facades, retail frontages, and commercial lobbies where the door carries both the brand and the building envelope.
Amenity spaces, rooftop enclosures, and common area entries where a consistent steel specification runs across the project.
Performance ratings
NFRC ratings are calculated for the full glazed assembly, not the frame alone. Values vary by glazing selection and configuration. The figures below reflect the OTTOSTUMM W50 TB thermally broken swing door assembly.
| Glazing (W50 TB thermally broken),U-factor,SHGC,VT,Air leakage |
|---|
| Dual pane SB60 laminated,0.35,0.29,0.50,0.3 |
| Dual pane SB70 laminated,0.35,0.20,0.46,0.3 |
| Triple pane SB60/SB60/Clear,0.27,0.23,0.41,0.3 |
| Triple pane SB70/SB70/Clear,0.26,0.13,0.26,0.3 |
Title 24
Thermally broken Studio Steel doors can be built to achieve tested NFRC ratings that an energy consultant applies to a project’s Title 24 calculation. This is not a Title 24 certification of the product itself.
Miami-Dade
Miami-Dade County Notice of Acceptance varies by assembly. Confirmation available on request.
Frequent Questions
Reviews
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Related pages
- Studio Steel product overview
- OTTOSTUMM W20 profile
- OTTOSTUMM W40 profile
- OTTOSTUMM W50 TB profile
- OTTOSTUMM W75 TB profile
- Jansen Janisol Arte 2.0 profile
- Studio Steel Dutch doors
- Studio Steel bi-fold doors
- Finish and coating system
- Performance and certifications
- Architects resource hub
- Revit files, RVT
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