From: Michael Bryson <bryson(--nospam--at)civil.ubc.ca>
Date: Wed, 21 Jun 2000 19:36:55 -0700 (PDT)
Correct me if I am wrong, but I think the original question was trying to
ask if you can reduce your snow drift caused by snow build-up against the
new building's walls (i.e. reduce hd in Fig. A-16-4). It is my opinion
that if you built a sloping roof profile matching the drift surcharge
profile (ie slope=hd/Wd) then the drift surcharge would equal zero. This
is because drifting is caused by wind blowing dry snow around, and the
snow doesn't care if it blows over a roof or existing snow. Hence, there
is no snow build-up.
On Wed, 21 Jun 2000, Jake Watson wrote:
> Only to an extent will it work. Snow loading can be a big deal here in
> Utah. If the roof slope is steep enough you can take load reductions.
> But as a rule of thumb, this won't eliminate the problem. At best it
> will only lessen it. If you raise the old roof above your new one, you
> won't have any problems. See the appendix to chapter 16 in the back of
> the UBC for general guidelines. If you are unfamiliar with snow
> loading, make sure you talk with someone (read building official) who is
> familiar with the area and snow provisions. Where are you planning on
> Jake Watson, E.I.T.
> Salt Lake City, UT
> One last though, the drifting on the existing building won't have to be
> considered if they are far enough apart. I don't have the provisions if
> front of me, so look at the appendix.
> Pat Ebner wrote:
> > A project manager just came in and asked if I had ever heard of basically building a sloped roof on a lower building to eliminate the snow drift load. He has a building which is to be built next to a shorter existing building, which was not designed for a snow drift load. I have not heard of anything like this. Has anyone done this or knows if this would work?