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Xlok Ultra

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Xlok Ultra is a robust and versatile, non-fragile panel glazing system glazed in 25mm structured polycarbonate with strong glass fibre internals. This heavy duty wide span system incorporates glazing bars joined by a carefully engineered fully thermally broken I-beam and is ideal for mono or dual pitch glazing, Northlight replacement, covered walkways and canopies.

Xlok Ultra Features and Options



Integral main profile assembly comprises top and bottom extruded aluminium cappings to BS1474 and a main, structural glass reinforced, polyester resin pultruded profile.The main profile assembly is designed with internal water management and a fully shielded seal system.

Available in mill finish or powder coated white to RAL 9910 BS6496. Other colours are available on request at an additional cost.

Fixings must be high quality stainless steel, of a type suitable for the sub-structure to which the panels are being fixed. Stainless steel greatly reduces the possibility of an electrolytic reaction at the bar/fixing interface.

Xlok Ultra panel glazing systems can be specified with UV protected 25mm multiwall polycarbonate in clear, bronze and opal tints for solar control.


Translucent silica is inserted into the flutes of the multiwall polycarbonate sheet. Aerogel works to deliver an impressive combination of benefits:

  • Thermally insulating with a U value less than 1W/m2K
  • Diffused natural daylighting
  • Improved acoustic performance
  • Lightweight glazing meaning quick and easy to install


Xlok Ultra panels are delivered to site with a protective film covering the glazing, which must be removed after installation. Panels should be treated with care. Unloading and manoeuvering is usually easiest by hand. Panels must never be exposed to weather before installation and should be stored in clean, dry conditions, protected against direct sunlight and in an upright position.

Polycarbonate rooflights should only be cleaned with copious amounts of warm soapy water solution and a soft cloth. Never use solvents or alkaline cleaners or thinners. Do not scrub with brushes or sharp instruments, as these will mark the surface. If a rooflight is found to be damaged it must be replaced.


National Performance Centre
National Performance Centre
Christies Auction House, Vaulted Rooflights
Christies Auction House
Pennistone Market, Xlok Panel Glazing
Penistone Open Market

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