4Edge Pro

patent glazing systems - modern roof glazing

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As our most advanced and thermally efficient solution, the 4Edge Pro system secures infill materials on all four sides using unique dry-sealed transom mullions. This cutting-edge solution provides superior weatherability, sleek sightlines, and hidden fixings. It merges the best features of roof-lighting solutions with the strength and span capabilities of curtain walling.

The 4Edge Pro eliminates the need for additional weathering tapes or silicone sealants, protecting the system from the effects of poor seals and environmental damage. Its innovative design significantly extends durability when compared to alternative sloping solutions.

Available in single, double or triple glazing configurations, the system is highly adaptable.

Fully compatible with our Skyline Box, Skyline, Rafterline and Traditional glazing bars, it is ideal for creating an appealing visual effect in both modern and traditional architectural projects. This next-generation system sets new standards in structural timber roof solutions by combining advanced technology with long-term durability and unparalleled flexibility.

Advantages

  • Weather Resistance: The system is protected from the effects of harsh conditions, outperforming competitor designs.
  • Thermal Performance: Outperforms standard 2-edge solutions, enhancing energy efficiency and reducing heat loss.
  • Durability: A fully drained design avoids the issues associated with silicone or weathering tapes.
  • Versatility: Compatible with various systems, including the Rafterline patent glazing system, and accommodates glass from 6mm to 50mm.
  • Flexible Installation: Suitable for pitches as low as 5° to vertical, addressing a wide range of architectural needs.
  • Strength and Stability: Designed to cover large spans without being limited by the integrity of the rafters.
  • Seamless Aesthetics: Concealed capping fixings create a clean, appealing appearance.
  • Regulation Compliant: Meets the requirements of Building Regulation Document L, ensuring energy efficiency and performance.
  • Thermally Broken: Designed to minimise thermal bridging, enhancing overall energy efficiency.
  • Suitable For Accepting Opening Vents: Provides the flexibility to incorporate opening vents for improved ventilation.
  • Glazing Options: Supports single, double or triple glazing configurations for various performance needs.

Considerations

  • May not be suitable for certain refurbishment contracts due to rebates in existing structure being too shallow for glazing bars.
  • Not compatible with our proprietary skylight systems.
  • The supporting structure must be free from twist and accurately aligned to accommodate the 4Edge Pro glazing system.
4edge pro double glazed - modern roof glazing

Double Glazing System – 4Edge Pro incorporating Skyline Box SPG5 type thermally broken extruded aluminium glazing bar with screw-on PC5 capping and snap-on cosmetic square topped PC2 capping section – double glazed with 28mm thick double glazed units in a mono-pitched configuration.

4edge pro triple glazed - modern roof glazing

Triple Glazing System – 4Edge Pro incorporating Skyline Box SPG5 type thermally broken extruded aluminium glazing bar with screw-on PC5 capping and snap-on cosmetic square topped PC2 capping section – Triple glazed with 44mm thick triple glazed units.

Our 4Edge Pro glazing system stands out as a superior weatherproof solution compared to traditional sloping curtain walling systems. The internal box section of the glazing bar delivers exceptional strength, while the screw-on pressure cap ensures robust weathering.  For a seamless aesthetic in modern roof glazing, you can choose from plain or ornate snap-on cappings that conceal all fixings.

When combined with high-performance double glazing units featuring warm edge spacer bars and argon gas filling, the 4Edge Pro system achieves an impressive overall U Value of 1.35 W/m²K, fully compliant with Building Regulation Document L.

For even greater thermal efficiency, the 4Edge Pro system used with high-performance triple glazing units, warm edge spacer bars and argon gas filling can reach an outstanding overall U Value of 0.95 W/m²K, also meeting the requirements of Building Regulation Document L.

Experience the ultimate in weatherproofing and energy efficiency with the 4Edge Pro glazing system.

The transom mullion’s ultra-thin capping spans the glazing bar drainage channels, ensuring a fully drained system without reliance on secondary seals.  This innovative design significantly reduces risks associated with poor workmanship, environmental factors during application, and maintenance challenges, ensuring long-lasting and reliable performance.  The versatility and adaptability of the 4Edge Pro system are remarkable; it can accommodate glass thicknesses ranging from 6mm to 50mm, providing flexibility for various project requirements.  Additionally, the system can be installed at pitches as low as 5° to vertical, making it suitable for a wide range of architectural applications and designs.

Span Chart

Performance Data for 4Edge Pro incorporating Skyline Box patent glazing bars

Bar Section
SPG 5
SPG 7
SPG 10
Box Depth (mm)
50
75
100
Lxx-mm4
459,350
1,043,625
1,861,293
Zxx-mm3 Plastic Modulus
17,495
28,284
39,405
Roof Span (mm)*
Double Glazing
1450-3440
2200-4230
2930-4880
Single Glazing
2930-4880
3310-5000
3840-5750
Canopy Glazing
2650-3830
3460-4700
4000-5430

The glazing bar spans shown above are based on using 6mm thick glass for the double glazed, single glazed and canopy types and the bars being spaced at 600mm centres. We will select the appropriate glazing bar for each contract. Spans are dependent upon the site location and exposure rating, site altitude, distance from the sea, height of glazing from ground level, shape of the roof, pitch of glazing, glazing bar centres, glass weight, wind speeds, snow load, dead load and maintenance loads.

* The above spans for each glazing bar have two values. The lower span values are calculated using the most extreme environmental loadings possible in the UK whereas the higher span values are based on the least extreme. Due to the wide range of these values it is therefore essential that we are supplied with the site postal code to enable us to calculate the correct glazing bar type for every project. There are a large number of variables which are used to determine the maximum span of the glazing bars so please do not attempt to buy any glazing bar materials from us without first allowing us to carry out the necessary calculations for your project.