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Re: Snow Depth

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UBC snow analysis when done correctly will yield accurate loading
conditions.  it is important to understand the site completely.  Predominate
wind direction and the density of the surrounding trees are probably the two
most important issues to consider.

Most residential properties that have even a little architecture will end up
with windows partially covered with snow.  Good detailing of the
waterproofing is critical and the owner can not cut corners on the materials
with respect to this issue.

In general, all penetrations of the roof should be eliminated.  The snow and
ice will tend to collect around them and tear them off as the snow slides /
moves down the roof.  Venting can be done through the sides.

Also be aware of chimneys on the downhill eaves.  Ice splitters will be
required or you will loose the chimney.

Bill Nelson

----- Original Message -----
From: "Matt Melcher" <MattM(--nospam--at)>
To: <seaint(--nospam--at)>
Sent: Thursday, March 29, 2001 4:09 PM
Subject: Snow Depth

> Snow loads for the 97 UBC are covered in the Appendix for chapter 16.
> the ground snow load and using these formulas you can determine the
> of the base of the snow, and "height" of the drift of the snow.  These
> heights are based on a density of snow up to a maximum of 35 pcf.
> I have a project with windows and exhaust vents that are subject to being
> buried by snow drifts.  Is using a height determined from the appendix
> unconservative for placing windows and exhaust vents?
> Anyone with some experience with this?  Any good references that talk
> how these values are determined?
> Matt