SFS Continuous Walling: What It Is, When to Use It, and Why DogWall Ultra Is the Better Way to Build It

SFS continuous walling, also called oversail SFS, is one of two ways to build a non-load-bearing external wall using a steel frame system. Where infill SFS is fixed between floor slabs, continuous walling runs in front of them. The SFS frame is built on the outside face of the primary structure, fixed back to it at calculated centres with engineered cleats, and the full building envelope (insulation, air barrier, and cladding) is applied continuously across the face of the building.

The result is a cleaner thermal envelope, better continuity of insulation, and a facade with no cold bridges at slab edges. For commercial buildings in Scandinavia and Northern Europe, where thermal performance targets are demanding and facade aesthetics increasingly matter, continuous SFS walling has become the specification of choice over infill on most mid- to high-rise projects.

The challenge is the same as it is for any SFS wall: how it gets procured and assembled. And that is where DogWall Ultra changes the equation entirely.

Continuous SFS vs Infill SFS: The Key Differences

Understanding why continuous walling is specified matters before discussing how to build it better.

In an infill SFS wall, the frame sits between the floor slabs. The slab edges are exposed on the outside face of the building and must be wrapped with cladding separately, introducing thermal bridges and detailing complexity at every floor level. Infill is faster to fix and uses less steel, which is why it dominates lower-budget and lower-specification projects.

In a continuous SFS wall, the frame oversails the slab edges. Insulation and cladding run uninterrupted across the full height of the building, with no slab-edge cold bridges and no floor-by-floor detailing breaks. The fixing cleat at each floor level is the only thermal bridge point, and in a well-designed system that is managed with thermal break washers. Thermal performance is consistently better. Acoustic performance across floor levels is better. The finished facade is architecturally cleaner.

For projects where the building specification demands U-values below 0.20 W/m²K, or where facade continuity is part of the architectural intent, continuous SFS walling is not an option. It is the requirement.

The Problem with Procuring a Continuous SFS Wall the Traditional Way

A continuous SFS wall assembly, procured the conventional way, involves the following separately sourced components:

• SFS framing sections (studs, tracks, cleats) from an SFS manufacturer

• Thermal break cleats or washers from a fixings supplier

• Insulation from a mineral wool or PIR manufacturer

• Air barrier membrane from a membrane supplier

• Cladding subframe from a secondary steel fabricator

• External cladding panels from a facade panel manufacturer

• Window reveal boxes or trims, site-fabricated or sourced separately

  
  

That is six to eight suppliers. Each is responsible only for their component. The interfaces between them (where insulation meets membrane, where membrane meets subframe, where subframe meets cladding panel, where the whole assembly meets the window frame) belong to nobody. They are resolved on site by the installing subcontractor, working from drawings, under programme pressure.

When a thermal bridge appears, or moisture tracks in at a window reveal, or a panel moves after installation, the liability question becomes a negotiation between six parties. Resolution is slow and expensive.

This is not a materials problem. Continuous SFS performs. The problem is that the system is assembled from components that were never designed to work together, sourced from suppliers who have no contractual relationship with each other, and detailed on site by a trade that is working from a specification no single party owns end to end.

DogWall Ultra: Continuous SFS Walling as a Single System

DogWall Ultra by SIMPLEX Technologies is a factory-configured, flat-pack continuous SFS wall system. One order covers everything required to build the complete external wall: SFS frame with cleats, Rockwool insulation, air barrier, cladding subframe, and cladding panels. Every component is manufactured together, configured to the project dimensions, and delivered to site as a single kit. Window openings are pre-engineered at the factory stage, built into the frame geometry at order.

Six to eight suppliers become one. One warranty covers the complete system. General labour can install the kit without a specialist SFS subcontractor. There is no on-site cutting or sizing of any component.

The system is patented. No competitor currently offers a complete configured continuous SFS wall kit from a single manufacturer.

What Comes in Every DogWall Ultra Order

Every DogWall Ultra delivery is a complete, project-specific wall kit. The components:

SFS frame: Cold-formed steel C-sections and tracks CNC-manufactured to the exact bay dimensions and floor-to-ceiling heights of the project. Cleat positions for oversail fixing are engineered into the frame. Window opening positions are built in at manufacture. Nothing is cut on site.

Insulation: Mineral wool insulation sized to fit precisely between and over the SFS studs. No site trimming. No gaps at junctions.

Cladding subframe: Modular aluminium or steel subframe, pre-cut and pre-coordinated with the SFS frame geometry. Subframe pins are engineered directly into the SFS frame, so there is no independent subframe positioning on site.

SIMPLEX cladding panels: Customer's choice from the full SIMPLEX panel range. Panels arrive pre-cut to the specified dimensions and hang directly to the subframe. Window openings are already formed in the frame at manufacture — nothing is cut or adjusted on site.

What DogWall Ultra Delivers for Each Stakeholder

For developers: One order, one delivery, one point of accountability. No managing six separate building envelope suppliers. No interface disputes when something fails. There is only one party. Programme certainty: the wall arrives as a configured system and installs faster than a site-built alternative. In a 6-storey commercial building with a 300-metre perimeter, the thinner continuous SFS assembly compared to masonry recovers 540 m² of usable floor area, worth €1,350,000 at €2,500/m².

For main contractors: No specialist SFS subcontractor required. No multi-supplier delivery sequencing. No on-site cutting or sizing. General labour installs the complete kit. Programme moves faster because the wall arrives ready, not as raw components waiting to be assembled into a system.

For architects: A fully tested wall assembly with a single system specification and a single warranty document. Full design freedom across the SIMPLEX cladding range: fibre cement, metal cassette, composite panel, and more. One technical contact for the complete wall system.

The Cladding Finish Is Fully Configurable

DogWall Ultra is not a fixed aesthetic. The system is a configurable platform. The external cladding is specified at order from the full SIMPLEX panel range:

• Fibre cement panels with hidden fixing systems

• Metal cassette panels

• Composite facade panels

• Tile-format cladding elements and many more

Panel dimensions, insulation thickness, and window positions are all specified upfront and factored into the factory configuration. The finished facade is indistinguishable from any site-built continuous SFS wall. The difference is entirely in how it was procured, delivered, and installed.

SIMPLEX Technologies: External Wall and Facade Specialists

SIMPLEX Technologies are specialists in non-load-bearing external wall systems and ventilated facade solutions, with over 300 completed projects across the Baltics, Scandinavia, and the UK.

If you have a project where a continuous SFS external wall is under consideration, we are happy to advise on system configuration and prepare a technical proposal.

📧 simplex@simplex.lv 📞 +371 28603704 🌐 simplex.lv