february 24, 2010 10:33am

Euro Fighter on roof?

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So what's so interesting about 2 inches of snow on a roof? Parts of the UK will have had 5 times as much as we did this winter.

Well, there are quite a few low level training flights in the valley, from RAF Valley, and they occasionally come right over our hill from the west on a predictable flight path.

The house is, like many PH I imagine, very sound proof. With all doors and windows closed only the loudest of noises get past the sound of my keyboard. The lowest jets sound relatively loud, but nothing like the noise when heard from inside a conventional timber frame or bricks and mortar structure.

Three days after recent snow, and long after it had apparently all melted away, we were slightly startled by the sound of a jet flying overhead, but it did not appear rushing off to the east where it should have been, and the sound was brief and unusually truncated. We looked at each other and as ususual I jumped to a conclusion and rushed out saying that "something has come down", meaning a tree or the like.

It was only when I climbed the bank behind the house that I realised the sound must have come from a large patch of snow sliding off the north facing roof slope.

This got me thinking: Designers try and align PH facing due south, with the south facing roof pitch sometimes being influenced by the fitting of solar collectors or tiles. However, the north slope might be designed with a shallower pitch to accommodate a living roof etc. PH roofs are so well insulated that snow accumulation is more likely, even on a 35-40° slope, than on a conventional building. Could this become a potential issue if UK winters become more extreme?

Just wondered...

Posted By: MarkTiramani

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