Steel Thermally Broken Windows

Propak’s innovative thermally broken steel system has been well received by many major architects and is now used extensively in high end residential and refurbishment projects throughout UK.

We have worked on behalf of some of the largest developers and property owners such as The Crown Estate and are now the largest UK based fabricator of the slimline system. We have a wealth of experience in design, manufacture and installation so can support you from initial design right through to completion.

The very narrow profiles provide an economic and aesthetically appealing solution for a wide range of window constructions with impressive face widths of just 25 or 40 mm. The steel and glass fibre construction guarantees minimal heat loss and maximum stability.

The profiles can give a sleek minimal frame for a modern building and for refurbishments to maintain an authentic, historical look to outside of the building whilst meeting the highest standards in terms of thermal and acoustic sound reduction; with practically no restrictions.

The conventional opening types for buildings from the 1950’s and 1960’s, such as inward or outward-opening side-hung, double vent, bottom-hung, top-hung or projected top hung windows, can be constructed from standard profiles.

Technical Specification

The systems that we manufacture can be designed to accommodate a wide range of specifications as shown in the tables below.

A large range of curved units and surface finish options are available to with all conventional opening types such as inward or outward-opening side-hung, double vent, bottom-hung, top-hung, projected top hung, pivot, or tilt and turn windows, can be constructed using standard profiles within the system.

Acoustic	Up to 47dB Heritage System: 34mm Glazing depth. HI System: 90mm Glazing depth. Double and triple glazed units provide a range of enhanced acoustic performances.
Thermal Properties	U-Values down to 0.8 W/m2K Ultra HI System: U-Values down to 0.69 W/m2K for fixed panes
Maximum H	Heritage System: 1800mm HI System: 2800mm Primo System: 2800mm TF System: 2300mm
Materials	Mild Steel Bronze Stainless Steel Corten
Surface Finishes	PPC – Polyester Powder Coating – Standard & Non Standard RAL Colours Specialist PPC finishes in Anodonic Colours (Bronze, Pewter, etc.) Colour matching available Stainless Steel – Brushed or Mirror Polished Bronze – Brushed, Mirror & Patinated Corten
Glazing Depths	Heritage System: 34mm Ultra HI System: 90mm
Construction Types	Arched heads & bespoke geometrics Inward or Outward Opening Side-hung Vents Double Vents Bottom-hung Top-hung Projected Top Hung Pivot Windows Tilt and turn
Access Equipment Ironmongery	Hinges: Welded or Screw-on. PPC, steel or stainless steel Concealed Hinges: Tilt & Turn Option only. Locking: Concealed multi-point locking, Cockspur Handles: Espagnolette, Lockable Espagnolette, Cockspur (Satin, Copper, Brass, Dark Bronze, Gun Metal, Antique Black) Safety: Friction Stays, Concealed Restrictors
Spread Technical Features	Arched heads and bespoke geometrics available Connection to solid wall or lightweight wall construction Connections to curtain wall and glazed partitions all fully certified Installation depth 60mm Dry and wet glazing
Tests Certificates	Heritage CE marking details: Water tightness EN 12208 Class 9A – 600 Pa Resistance to Wind load EN 12210 Class C4-1600 Pa Air Permeability EN 12207 Class 4 – 600 Pa Thermal Production EN ISO 10077-1 1.9 W/m2K Metal Profiles with Thermal Barrier in accordance with EN 14024 Airborne sound insulation to Rw 50 db HI System CE marking details: Water tightness EN 12208 – Up to E750 Resistance to Wind load EN 12210 Class C5 Air Permeability EN 12207 Class 4 Thermal Production EN ISO 10077-1 0.92 W/m2K Metal Profiles with Thermal Barrier in accordance with EN 14024 TW/CT2 Airborne sound insulation to Rw 46 dB

Steel Thermally Broken Windows

Technical Specification

GALLERY