Ström Architects — Catalonia — Spain
Overview
Patented technology removing the barrier between indoors and outdoors. The Vitrocsa Invisible Frame system embeds all rails and frames flush within the floor, walls, and ceiling — leaving only the glass visible. No raised threshold. Just uninterrupted sightlines.
The Vitrocsa Invisible Frame is a patented window system that removes the barrier between indoors and outdoors. The frame is fully embedded under the floor, in the ceiling, and in the walls, allowing a glass wall with no visible vertical mullions or thresholds. The track is concealed beneath the floor finish, creating a flush surface with no raised threshold — ideal for seamless indoor-outdoor living and improved accessibility. The Invisible Frame is available in single-track or multi-track configurations and is compatible with Vitrocsa's core ranges: V56, TH+, and V32. The Invisible Frame operates as both a standalone system and as a configuration of the Vitrocsa Sliding system, where it appears as “Invisible Frame With One or Two Tracks”. It is also integrated by default into the Turnable Corner system.
Key Features
Engineered details that define the system
01
Unobstructed Sightlines
The window frame is fully embedded under the floor, in the ceiling and walls, allowing a glass wall with no visible vertical mullions or thresholds. Indoor and outdoor spaces blend together, enhancing views and design continuity.
02
Flush Floor Integration
With the track concealed beneath the floor finish, there is no raised threshold. This provides unobstructed passage — ideal for seamless indoor-outdoor living and improved accessibility.
03
Weather-Sealed
The Invisible Frame is thermally insulated and weather-sealed, matching the performance of our other systems even in demanding climates. Drainage and maintenance are managed out of sight.
04
Single-track or Multi-track
Available in single-track or multi-track setups, the Invisible Frame can be tailored to opening size. It is compatible with Vitrocsa's core ranges (V56, TH+, V32) and is integrated by default into the Turnable Corner system.
Finishes
A refined palette of finishes
Every Vitrocsa system is available in a range of finishes to suit your architectural intent — from the signature anodised aluminium to bespoke powder coatings and stainless steel.
Anodised Finishes
Standard EV1 anodised aluminium at 25 microns — the signature Vitrocsa finish, with special anodisation available for a bespoke metallic tone.
Powder Coated Finishes
A large choice of RAL colours, from anthracite grey (RAL 7016) to jet black (RAL 9005), applied as a uniform matte powder coat.
Textured Finishes
Matte, fine-textured effect coatings such as “Moon Dust” (IGP-Effectives® 5903U90070F10) — volcanic ash with the subtle glow of meteorites — adding tactile depth and a refined surface character to the profile.
Bespoke Finishes
Bespoke effect colours from the IGP-Effectives® collection paired with IGP-DURA®one 56 — such as “Terra di Sienna” — alongside brushed stainless steel for a truly custom architectural statement.
Invisible Frame Window Range
The Vitrocsa Invisible Frame system embeds all rails and frames flush within the floor, wall and ceiling — eliminating visible thresholds entirely. Available in V56 and TH+ two-track configurations and the V32 single-track range for thermal reinforcement.
In Motion
See the system in action
Technical Specifications
Invisible Frame Comparison Table
Below is a comparative overview of the Invisible Frame window system's available ranges, highlighting key specifications and capabilities of each.
| Window Type | V56 | TH+ | V32 |
|---|---|---|---|
| Tracks | Two tracks | Two tracks | Single track |
| Connection Thickness | 22 mm | 22 mm | 23 mm |
| Panel Size | < 20 m² | < 20 m² | Up to 12 m² |
| Glass Thickness | 56 mm | 32 to 42 mm | 32 mm |
| Finishes | Standard EV1 anodised 25 microns; Powder coating; Special anodisation | Standard EV1 anodised 25 microns; Powder coating; Special anodisation | Standard EV1 anodised 25 microns; Powder coating; Special anodisation |
UK Availability
Available in the UK
The Vitrocsa Invisible Frame system is available to specify, purchase, and install in the UK through Vitrocsa UK. All three Invisible Frame ranges (V56, TH+, V32) are available in the UK.
Technical Downloads
CAD, BIM & datasheets
Download the Invisible Frame datasheet directly, or request CAD drawings and Revit BIM objects from our technical team.
Installation
UK Installation & Aftercare
Vitrocsa systems in the UK are installed by UK-based trained installers, using a hybrid in-house and partner programme model. After installation, Vitrocsa UK serves as your primary support contact through a hybrid aftercare model.
Lead time: Typically 12 weeks from drawing sign-off.
Pricing: Provided on quotation; commercial terms available on request.
For Specifiers
For Architects & Specifiers
The Invisible Frame system is designed for architects and specifiers seeking frameless minimalist glazing. Our UK team provides:
- —Full specification support: CAD drawings, Revit BIM objects, NBS specifications
- —PDF datasheets for V56, TH+, and V32 ranges
- —Technical guidance from concept through to installation
In Practice
Related Projects
Projects featuring the Vitrocsa Invisible Frame window system.
FAQ
Invisible Frame FAQs
Answers to the most common questions about the Vitrocsa Invisible Frame window system. Can't find what you're looking for? Ask Cortex or contact our team directly.
Next Step
Request a Quote for the Invisible Frame System
Share your project details and our UK technical team will prepare a detailed quotation. Pricing is provided on quotation; commercial terms are available on request. Typical lead time is 12 weeks from drawing sign-off.
Gated Resource
The Specifier's Guide to Minimal Glazing
A comprehensive reference for architects and specifiers working with minimalist window systems. Covers system selection, thermal performance, glazing specification, structural requirements, and installation planning.
System range comparison — V56, TH+, V32 & 3001
Glazing specification: double vs triple, coatings & interlayers
Thermal performance data & U-value guidance
Structural requirements & site preparation checklist
Finish options & material samples guidance
Project planning timeline & specification checklist
Company Brochure
Download the Vitrocsa corporate brochure
A complete overview of our heritage, six window systems, certified performance, and global architectural references.
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Explore the Full Range
Discover every Vitrocsa system
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System 02
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System 06
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