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RE: frost heave

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Frost heave forces are extremely large and will exceed the dead weight of
your slab. The slab will move if ice lenses form under it.
You do not say what the slab supports. If the slab is exposed to freezing
temperatures you could use non-frost susceptible gravel (Fines < 3 to 5%) to
the seasonal frost depth. You may also reduce the frost depth by placing
closed-cell polystyrene insulation the slab. Use the insulation if the slab
support a freezer.

-----Original Message-----
From: Pat Clark [mailto:bcinc(--nospam--at)]
Sent: Monday, October 13, 2003 12:56 PM
To: seaint(--nospam--at)
Subject: frost heave

I am looking for any references or input on designing a p.t. slab in an area
that typically requires frost protection down to 24".  I am wondering if the
slab could be designed to resist the heaving forces from the possible frost
lenses.  And if so, what sort of criteria could we design the slab for to
approximate those loads?
I am designing the structure, and consulting with a p.t. engineer out of Ca,
so they do not have any idea of what those loads would need to be.
Any recommendations would be most welcome.
<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" />

Patrick Clark, P.E.

Building Concepts, Inc.

<?xml:namespace prefix = st1 ns =
"urn:schemas-microsoft-com:office:smarttags" />1228 Pep Circle

Gardnerville, NV 89410

(775) 782-8886 x22

(775) 782-8833 fax


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