PSN-L Email List Message
Subject: Re: low pressure tilt?
From: ian ian@...........
Date: Wed, 12 Mar 2008 08:08:18 +0000
Hi,
thinking about its construction (concrete poured onto sand), it is
possible that there could be trapped air underneath, which would have an
obvious effect...
Cheers
Ian
ChrisAtUpw@....... wrote:
> In a message dated 2008/03/11, ian@........... writes:
>
>> underneath is clay. It's very tough stuff, digging it out was quite
>> hard.
>
> Hi Ian,
>
> Thiscan be expected to expand quite a lot when it absorbs moisture.
>
> Could you have an air pocket underneath the slab? That could
> respond to air pressure changes.
>
> Regards,
>
> Chris
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