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RE: footing - frost depth

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I've used extruded foam also, but I have heard recently from an
architect that its long-term properties in wet soil may not be very
good.  It may lose its insulating value.  I haven't been able to
confirm.  Anyone have any news on that ?

Also, in a crunch once, the geotech agreed to allow me to count the 300
mm of MG20 (0-3/4") compacted cushion, since it is not affected by
frost.  So my footing was 300 mm above the presumed frost line.


Kevin Below


-----Original Message-----
From: Daryl Richardson [mailto:h.d.richardson(--nospam--at)shaw.ca] 
Sent: 23 mars 2006 11:17
To: seaint(--nospam--at)seaint.org
Subject: Re: footing - frost depth


Gary,

        This must be a regional thing.  I've used Styrofoam insulation 
several times to insulate footings against frost action.  Here in
Calgary an 
engineer's stamp is required if the footing is not below frost depth;
but 
other solutions are allowed.

Regards,

H. Daryl Richardson

----- Original Message ----- 
From: "Gary Hodgson & Associates" <ghodgson(--nospam--at)bellnet.ca>
To: <seaint(--nospam--at)seaint.org>
Sent: Thursday, March 23, 2006 6:02 AM
Subject: Re: footing - frost depth


> Jim,
> Out of curiosity, what are the other methods allowed by
> your code?  Up here, the municipal authorities only want
> to see the footings below frost level, so you have to do
> a lot of dancing.
> Gary
>
> On 22 Mar 2006 at 14:11, Jim Wilson wrote:
>
>> The IRC states "...foundation walls, piers and other permanent 
>> supports
>> of buildings and structures shall be protected from frost by one or
more 
>> of the following methods:  1. Extending below the frost line..."
>>
>>   Subsequently, the bottom of footing must be set at or below the 
>> frost
>> line.  Some engineers and architects detail the top of the footing at

>> frost line.  It's my guess that this is an older-school approach.  I
say 
>> that only because I have seen it on older drawings, not in common 
>> practice.
>>
>>   For sloping grades, the footing depth needs to be measured
>> perpendicular to the slope.  This could increase the vertical depth.
>>
>>   Jim Wilson, PE
>>   Stroudsburg, PA
>>
>> IRV FRUCHTMAN <ifaeng(--nospam--at)yahoo.com> wrote:
>>   Dave
>> I thought the bottom of the footing is placed at or
>> below the frost depth.
>> Irv
>>
>> --- David Topete wrote:
>>
>> > List:
>> > Can someone give me a brief summary of foundation
>> > design (or detailing) with regard to frost depths
>> > noted? Do I basically place the top of spread
>> > footing at or below the frost depth? from finish
>> > grade?
>> > A reference would be just fine also. I rarely
>> > design for wind, snow, or frost, but there's a first
>> > for everything...
>> > Thanks in advance.
>> > DT
>> >
>> >
>> > ---------------------------------
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