[Greenbuilding] Glass roofing

Clarke Olsen colsen at fairpoint.net
Wed Aug 13 20:07:48 MDT 2014

My favorite pitch is 7.5/12, aka 10 in 16. When I started reviving a 19th cent church, I measured the roof pitch to find this odd dimension, 
and assumed it had sagged from a sensible 8/12, but no, that's a Greek proportion: the diagonal of the Golden Mean. All the old barns
and churches have that pitch, which I came to see as the shallowest that would shed snow and the steepest I could walk on. And it looks right. Ballon framing a gable end at 16"oc yields studs are in 10" increments.
Clarke Olsen
373 route 203
Spencertown, NY 12165 
colsen at taconic.net

On Aug 13, 2014, at 6:12 PM, Frank Tettemer <frank at livingsol.com> wrote:

> Clark, RT, and All,
> Clark, you've attached that photo before,
> and,
> Itis still a thing of beauty. I love thecurvy bracing. It makes it appear all so very light and floating.
> I have built greenhouses, (for plants), using a similar technique, I suppose.
> The roof was built with rafters on 30" centres, to fit the available batch of sliding door glazing, from Many deconstructed doors. Bridging was let into the rafters, under each shinglede overlap.
> It was not too hard,using a sliding jig on a table saw, to cut long, tapered pieces of cedar, almost the same length of the glazing, to aply to the tops of the rafters, at each "shingled" layer of glazing. Silicone was the fastener of choice for the glazing, and it remained leak-free for over twenty five years. The slope was almost a "square pitch", i.e., slightly less than 12/12. I believe that the steepness of pitch helped contribute to longevity.
> -- 
> Frank Tettemer
> Living Sol ~ Building and Design
> www.livingsol.com
> 613 756 3884
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