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Re: footing - frost depth

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The requirement here is for 4 feet of frost protection as
the powers that be have recognized that there are some
variabilities that will affect the frost penetration.
The actual max frost penetration here is in the order
of 3'.
Gary

On 22 Mar 2006 at 19:51, Jordan Truesdell, PE wrote:

> I've also heard it said that top of footing placement is sometimes 
> used because a cip footing with sloping/rough sides is more likely to 
> get "grabbed" and elevated by an ice lens, even if the bottom of the 
> footing is below the frost level. 
> Jordan
> 
> 
> 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 haveseen 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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