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Kalzip Low U value Liner Roof System U value 0 09 Y6G9w.rvt:
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Low U-value roof


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Roof facade Pitched roof Flat roof Curved roof

Technical Specification


The Kalzip low U-value roof system is a dual insulation system capable of achieving U-values as low as 0.10 W/m2/K. It has been developed in anticipation of changes to Part L of the Building Regulations in 2010 and beyond – changes that will lead to ever-tightening design limits on thermal performance.

The Code for Sustainable Homes represents current best practice for the construction of residential dwellings and is closely linked to the Building Regulations. It is generally accepted that a similar code will be extended to non-dwellings, driving the way forward to achieving zero carbon buildings by 2019.

The symbiosis of rigid insulation boards with glass mineral fibre layers allows the system to achieve such low U-values giving significantly greater overall thermal resistance compared to that of one single layer of insulation of the same total thickness.

The low U-value system is primarily based on a standard Kalzip standing seam roof build and as such is subject to the same basic set of criteria and properties for materials, finishes, geometries, accessories and components. It is available with four types of roof lining; standard liner; liner-deck; structural metal deck; timber deck.

Sustainable options
The low U-value system can be combined with renewable (Kalzip AluPlusSolar) and green roof (Kalzip Nature Roof) technologies.

Curving parameters
Where Kalzip Insulation 23 board is fixed to a curved liner, there are a number of possibilities to accommodate solutions for flat roofs and curved roofs down to a 1.5° radius.

NBS specifications are available on request along with further details on acoustics, fire and thermal efficiency.

For further information please download or request the Kalzip systems brochure or contact us.low U-value roof
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Kalzip Main Contact

Kalzip Ltd
Haydock Lane, Haydock
St. Helens
WA11 9TY
United Kingdom

Tel: 01942 295 500


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About the Company

Kalzip specialises in the international manufacture and supply of tailored metal solutions for building envelopes and is the world’s leading aluminium standing seam roofing and wall cladding system. Since being launched onto the market in 1968, over 90 million sqm of Kalzip aluminium profiled sheets have been installed on an increasingly wide variety of roofs and façades all around the world.

Kalzip is a precision engineered, multi component system with proven durability, high performance and low maintenance. Innovation, quality, technical capability, experience and service are just some of Kalzip’s key attributes with the company’s extensive research and development activities which are aimed at continually pushing the boundaries of modern construction capabilities and providing the very best building envelope solution every time.

A range of materials, finishes and shapes, virtually limitless design potential and advanced roll forming techniques have enabled Kalzip to combine functionality with stunning aesthetics on both small uncomplicated designs and world-famous, award winning projects.

Alternative products include;
• Kalzip foldable aluminium
• Kalzip solar solutions
• Kalzip Nature Roof
• Kalzip off site construction
• Bespoke fabrications
• A series of safety accessories and approved and certified system components.

In addition, Kalzip offer unrivalled levels of technical support combined with a fully established and experienced technical design service who are fully equipped and knowledgeable in the application of all Kalzip products and solutions.

With independent sites covering; North America, Europe, Middle East and Asia Pacific and sales offices worldwide, Kalzip boasts international experience with local services for customers. All Kalzip systems are installed by a fully approved, highly trained network of Teamkal contractors. For further information visit
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