[time-nuts] Re: in-ground clock room

[Andy Gardner, ZL3AG]

So the 2 things you're after are thermal insulation and vibration insulation?

Digging can be expensive, and you have to worry about water table in many locations.

How about the thickest concrete water tank you can find, plonk it in a nice location, spray layers of polyurethane foam over the top and sides for thermal insulation, then build a wind shield ("shed") around it. The shed could be an old coolstore, adding more insulation.

Concrete water tanks are out of fashion these days due to plastics, so if you shop around you can find a cheap used one, and then it's just the trucking/crane charges.