The Truth is Out There (Window Specifications)

Posted by on Aug 15, 2016 in Guides | Comments Off

The Truth is Out There (Window Specifications)

(Post by Karl and Liam)

  Glazing Frame Evidence Required for Passivhaus.pdf (97.9 KiB, 1,180 hits)


  Glazing Frame Specifications for Passivhaus.xls (87.0 KiB, 1,064 hits)

In a darkened basement there is a series of files, full of mystery and unanswered questions. The investigations held within these files are frequently hampered by a wall of secrecy which surrounds the subject matter. At every turn there seem to be half-truths and prevarication, with questions being sidestepped or overlooked. However, the investigators aren’t looking for proof of alien abductions, a vast conspiracy in the military-industrial complex or even the cause of some strange events in backwoods Virginia, likely caused by a limited gene pool and a chemical waste leak. They just want to know the U-values for some window frames and glazing.

We’ve lost count of the number of times we’ve asked for this information. We know it’s out there because it’s essential for BFRC certification, apart from anything else, but most manufacturers really struggle to provide it. When asked which window manufacturers to approach, it’s so much easier to suggest ones who are able to give us this essential data without the hassle of an email trail as long as Hilary Clinton’s list of deleted messages, or a series of phone calls long enough to send an FBI phone-tapper into a stupor. This is far from ideal: we would prefer, as both Designers and Certifiers, to be able to identify the best windows for any given project based on their technical performance.

So, for the benefit of window suppliers and manufacturers, we’ve developed an Excel sheet and PDF, which tell you exactly what we need to know and to what standard the numbers should have been calculated to.

Please make the evidence and filled-out spreadsheet easily accessible and downloadable from your website, and you’ll earn the gratitude of legions of Passivhaus designers beavering away at their projects. They’ll probably want to specify your windows, too.

The truth is out there – please help us to find out what it is.

PDF (read this and upload thermal reports to your website):

  Glazing Frame Evidence Required for Passivhaus.pdf (97.9 KiB, 1,180 hits)


Excel sheet (fill this out and upload to your website):

  Glazing Frame Specifications for Passivhaus.xls (87.0 KiB, 1,064 hits)