This web page might give you some ideas:

http://www.guralp.com/articles/20060315-design-pit-installations/general

Ian

Geoff wrote:
> Hello;
> I think you should have a small slab
> vibration isolated in the middle of the house at the foundation
> so winds and the like will not vibrate your
> devices when they act on the home.
> I have seen such a thing in manufacturing
> of micro circuitry just for some machines.
> A whole room with a slab insidide a room inside a building.
> They use some special caulk to keep
> the slab weather tight but does not transfer meaningful vibration.
>
> This is what I would do when first building the slab
> keeping in mind such a thing might weaken in
> if not built correctly to allow for
> stresses and strains of various kinds.
>
> You might saw a ring around the point of interest
> but i would allow a gap all around about an inch.
>
> Proper Isolation seems extreamly expensive
> and most probably not suitable for amateures.
>
> My setup is located maybe 3 feet away from
> the slab my mobile home sits on but the wind
> and inside motion still transfers vibrations
> to the sensor. I am relatively sure of all this
> since no situation with the sensor on the slab
> same as the home was suitable for me.
>
>
> ----- Original Message ----- From: 
> To: "psn" 
> Sent: Monday, August 25, 2008 4:32 AM
> Subject: craw space under house
>
>
> Hi All,   I am building a new house.   This house has no basement, but 
> has a 24"? crawlspace under the house.   I have lots of time, to 
> create a space for my three sensors, under the house.   I could also 
> place them in the garage on the concrete floor.   My thought was to 
> enter the crawlspace, and dig a small pit large enough to allow for 
> elbow room, then line the pit with concrete blocks to keep dirt away.  
> Perhaps covering the floor area similarly.  Concrete may not be the 
> best material.   I could also pour a pad or small footing using cement.
> Please any thoughts on preparing this space?
>
> Thanks, Ted
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