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Subject Author Date
Concrete slab for parking a car Les Desser 11-09-2006
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Posted by Bobk207 on November 15, 2006, 3:34 pm

Bob Morrison wrote:
> In a previous post Bobk207 wrote...
> > You're in London area, UK correct?
> >
> > Bob Morrison.....frost issues? None if his base is well drained?
> >
>
> BobK:
>
> You are correct. If the base is well drained then there will be no frost
> heave. It takes moisture that will freeze and expand.
>
> BTW, you can get frost heave in the floor of a walk-in freezer if you
> don't make sure the slab is well-drained.
>

I get frost heave in the "floor" of my mom's freezer...... :)

sometimes she forgets to close the door completely & the moisutre
overwhelms the defrost cycle .....the moisture freezes & "mounds" the
aluminum panel that is the "floor" of the freezer

I remove the floor panel & defrost with warm water & shop vac....good
as new

cheers
Bob


Posted by Les Desser on November 16, 2006, 3:39 pm

>You are correct. If the base is well drained then there will be no
>frost heave. It takes moisture that will freeze and expand.

I was actually wrong in my last post - the air temperature here in north
London was about 63 F. Today it was a cold 52 F. Tonight they are
expecting lows of 45 F.

Last year I think the worst we got was some mornings with frozen car
windscreens.

The chance of frost below an 8" slab here is not very high I suspect.
In any event the water table is at about 9' and there is very little
open soil to catch rain in the area.
-------

In any event, many thanks for all the posts and advice given here.
--
Les Desser
(The Reply-to address IS valid)

Posted by Bob Morrison on November 16, 2006, 6:31 pm
In a previous post Les Desser wrote...
> was actually wrong in my last post - the air temperature here in north
> London was about 63 F. Today it was a cold 52 F. Tonight they are
> expecting lows of 45 F.
>
> Last year I think the worst we got was some mornings with frozen car
> windscreens.
>
> The chance of frost below an 8" slab here is not very high I suspect.
> In any event the water table is at about 9' and there is very little
> open soil to catch rain in the area.
>

Les:

I believe our climates have similar temperatures. Mostly maritime
moderate with an occasional freeze.

Our local building codes call for building foundations to be a minimum of
12" below finished grade. So, there is some potential for frost heave but
not much. Again, a well-drained based will go a long way to preventing
the problem.


--
Bob Morrison, PE, SE
R L Morrison Engineering Co
Structural & Civil Engineering
Poulsbo WA
bob at rlmorrisonengr dot com

Posted by Les Desser on November 15, 2006, 3:40 am

>OR Just leave it out of your 8" slab :)

You and Bob have convinced me!
--
Les Desser
(The Reply-to address IS valid)

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