[Greenbuilding] Roof slopes (was Re: Glass roofing)

Benjamin Pratt benjamin.g.pratt at gmail.com
Fri Aug 15 07:51:45 MDT 2014


Or 1:1.618

BTW, I can't see my own messages. Are they going though?

Ben


On Fri, Aug 15, 2014 at 8:22 AM, Clarke Olsen <colsen at fairpoint.net> wrote:

> A golden rectangle is one from which you can mark-off the square of an
> end, and be left with a smaller rectangle of identical proportion. If X & Y
> are the short and long sides, then X/Y = Y-X/X. Why don't these keyboards
> have a proper division symbol?
> Clarke Olsen
> clarkeolsendesign.com
> 373 route 203
> Spencertown, NY 12165
> USA
> 518-392-4640
> colsen at taconic.net
>
>
>
>
> On Aug 14, 2014, at 6:08 PM, RT <ArchiLogic at yahoo.ca> wrote:
>
> > On Thu, 14 Aug 2014 16:49:07 -0400, Clarke Olsen <colsen at fairpoint.net>
> wrote:
> >
> >> True, the temples are shallower, but the diagonal of a golden rectangle
> (10 to 16.14....) is an ancient proportion used for
> >> roofs in New England.
> >>
> >> On Aug 14, 2014, at 3:28 PM, candtcampbell at juno.com wrote:
> >>
> >>> I could have sworn that the pitch of a Greek pediment was something
> like 5.2 in 12.
> >>> My favorite pitch is 7.5/12, aka 10 in 16.
> >
> >
> > "7.5/12" and 10/16 are both Murrican (ie based on Imperial units)
> approximations of the diagonal of the Golden Rectangle -- close, but not
> perfect, Perfection being that which the Golden Mean is supposed to
> represent, derived by geometry rather than arithmetic.
> >
> > Me ? I like 7/12 for roofs. 30 degrees. Easy to set up for cuts and
> joints. Not so steep that you slide off when walking around on it but steep
> enough that snow and rain don't accumulate on the outside and the inhabited
> roof volume is an interesting space  -- human scaled as opposed to slopes
> 12/12 or more which are better suited the Divine where much of the
> "soaring" space (or as one typo in a realtor's ad called it "sorrowing 20
> foot ceilings") of the interior roof volume cannot be practically utilised.
> >
> > Enginoids also like 30 degrees for roof slopes. Steeper than 30 degrees
> and live loading due to wind becomes a governing factor in the structural
> design --shallower than 30 degrees, gravity loads govern -- 30 degrees is
> the sweet spot between the two and is structurally very efficient.
> >
> > --
> > === * ===
> > Rob Tom  .  .  . T60BOM
> > Kanata, Ontario, Canada
> >
> > A r c h i L o g i c  at  Y a h o o  dot C A
> > (manually winnow the chaff from my edress if you hit "reply")
> >
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