Friday, 24 August 2012

First sloped glazing system to achieve PassivHaus certification

Daylight and Ventilation Solutions (DVS) exclusively represent Lamilux in the U.K. and we are therefore delighted to report that we offer the worlds first PassivHaus certified sloped glazing system.
This article sets out to explain what this certification means and why the PR60 is the roof glazing of choice for PassivHaus projects, as the only certified sloped glazing component. 

Dr Benjamin Krick from the PassivHaus Institute Darmstadt (centre) recently presented Lamilux CEO Dr Heinrich Strunz (left) and Technical Manager Joachim Hessemer with a certificate for the first sloped glazing component compliant with the PassivHaus Standard.

Click here for a full PDF copy of our PassivHaus Certificate

PassivHaus represents one of the most stringent standards in energy efficiency in modern construction. It is regarded as the world’s chief energy efficiency standard for new buildings and building refurbishments. This is because passive houses dispense with separate heating systems and make use of existing energy in buildings to provide heating instead. In order to comply with this requirement, PassivHaus planners rely on high-grade, energy-efficient quality construction materials which retain the maximum possible amount of energy inside buildings and provide an extremely airtight building envelope, thanks to their certified insulation properties. Lamilux has just been provided with conclusive proof that its glass roof structure CI System Glass Architecture PR 60 features such characteristics. This glass and aluminium system has recently been certified by the PassivHaus Institute in Darmstadt, Germany, as the first sloped glazing component suitable for passive houses. The aesthetically pleasing daylight system with its customisable shape achieved top marks and was assigned to the Advanced Component phA category.

Lamilux CI System Glass Architecture PR 60 is the product of consistent further development of the energy-efficient qualities in a thoroughly tried-and-tested glass roof structure, Lamilux CI System Glass Architecture KWS 60. The daylight system manufacturer Lamilux has used this structure in a whole range of sizes in many national and international projects, such as shopping malls, administrative buildings and office complexes. 

The perfect solution for larger area and bespoke roof glazing.

Twice the efficiency thanks to optimised insulation system

In accordance with Passive House requirements, the technical conditions provided in the newly certified system consistently allow glazing to be used which comprises three panes with Argon gas filled cavities. Two of these glass panes feature a low-e coating. The “warm edge” with Super Spacer forms a spacer system. The U value, or heat transmittance coefficient, in the 52mm glazing specification (Ug) is 0.70 W/(m²K) when installed in an inclined position.

Lamilux has developed a new insulation system for posts and rails, consisting of a combined impermeable core which unites the insulation block and the insulation web in a single component. The material used in the system makes the supporting structure twice as energy efficient. The heavy load from the glazing elements is absorbed by the glazing support, aided by glazing fastening bolts, while posts and rails feature very low heat transmittance coefficients of 0.91 W/m²K.

Lamilux have developed a a new insulation system for posts and rails.

Outstanding heat insulation with a UCwi value of 0.82 W/(m²K)

The Passive House Institute in Darmstadt established a UCwi value of 0.82 W/(m²K) for the daylight system as a whole. A good heat transmittance coefficient is one of the main criteria for successful certification and must be under 1.00 W/(m²K) for sloped installation in roofs.

Assessors attach great importance to other aspects when it comes to assuring compliance with Passive House requirements with hygiene playing a significant role. In order to prevent condensation and mould growth, the 12.6°C isothermal line must consistently lie within structures at an outside temperature of -5°C, an indoor temperature of +20°C and a relative humidity of 50 per cent. Lamilux CI System Glass Architecture PR 60 complies with this requirement.

Insulation properties and hygiene requirements play a decisive role in PassivHaus certification.

Heat loss is another factor; this is calculated for the frame system and the ‘warm edge’, and expressed by the coefficient ψopak. The lower this value is, the higher the efficiency class. In the case of Lamilux CI System Glass Architecture PR 60, the coefficient is lower than the maximum value of 0.110 W/(mK) for Passive House classification in the phA – Advanced Component class. 

Glass roofing for energy and cost conscious architects and planners

“With its CI System Glass Architecture PR 60, Lamilux has managed to bring onto the market the first post and rail system in the Sloped Glazing category,” state assessors at the Darmstadt-based Passive House Institute. This provides energy and cost-conscious architects and planners with the first ever glass roof solution which is not only suitable for passive house constructions, but also complies with requirements for the top Passive House efficiency class phA. 

Click here for a PDF copy of our PR60 Brochure.

Thank you for reading this article, if you would like more information about our PassivHaus certified skylights or any of our other energy efficient rooflights please leave a comment below, email us or call 01284 749051.

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