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Robert Hoellrigl, an Austrian graduated mechanical Engineer joined Encraft in 2006 and moved to India in 2013 as Encraft’s President of R&D and design. He briefed media on the important role of frame material in the whole window & door U-value assessment and how it can compensate in conjunction with warm edge spacer technology for a less onerous glazing specification.

According to him, the energy loss through windows and doors in apartments or flats can range from 30% to 45% which can be reduced significantly by specifying frames with enhanced thermal performance. A powder coated, non-thermally broken, single aluminium casement window with 45 mm profile depth utilizing 5 mm single glazing has a typical U-value of 5.9 W/m2K whilst the same frame in uPVC achieves 4.8 W/m2K. The slightly larger uPVC frame with its inherent warm material properties makes all the difference.

He added that though UPVC installations do not differ from wood or metal frames, the fasteners and the sealants have improved drastically over the time. ”Nowadays frame installation methods are well covered in comprehensive guidelines and standards like the German GKF Montagehandbuch or the British Standard BS 8213-4.”

Commenting on the Indian fenestration practices, he said, India’s window industry can benefit from the wealth of experience gained in other countries and could utilize today’s innovative materials which have been developed to ensure quality and consistency on site. “The most commonly used frame fixing method in India is the rawlplug type that served the fenestration industry well for decades but the Fischer FFSZ type anchor has taken the window industry by storm because of its simplicity, effectiveness and efficiency. As conciliation, India is not alone with irregular window and door apertures. Even countries with official national standards, covering window apertures in terms of size, parallelism, squareness etc. have still got issues with their regulated check reveals that means, the outer skin of a wall construction overhangs part of the outer frame thereby sheltering the joint between frame and aperture from the elements like UV rays, rain and wind.” He feels, India’s most commonly applied straight through aperture construction detail makes it more difficult to hide irregularities and requires more attention when finishing-off.


“The use of insulation foam will become an essential part for the installation of thermal efficient frames in order to eliminate any energy loss through joints, simultaneously improving the sound proofing of the installation. Applying finishing trims to frame installations will help to extend the lifetime of Silicone sealants. It is highly unlikely that energy costs will come down in the future hence the need to reduce avoidable energy losses through fenestration,” said Hoellrigl.


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