What you might need to do is de-couple the pier from the main floor if the Pier-Tech isolation mount doesn't work. When I built recording studios many moons ago we saw cut the floors to isolate them from the walls. Then we built the walls so that the sill plates were riding on neoprene strips, the sheetrock was hung with neoprene strips on all the studs and another neoprene strip as a gasket between the sheetrock and the floor. Top plates, you guessed it, more neoprene gaskets. The ceilings were suspended on springs hung from beams. EVERYTHING that could hum, bump, buzz or vibrate in ANY WAY was shock mounted with neoprene gaskets. We were fanatical about vibrations of any frequency being transmitted to the microphones. I'm not sure how deep your re-bar and mesh is but if you don't cut it and it's still tied to the pier it may still transmit vibrations. The Pier-Tech isolation mount would be my first step before I started cutting up my floor and trashing the obs with dust and debris. Then I'd just put rubber mats under all the stuff like the computer and any thing else with a fan in it. If you dry cut the floor you'll gave to strip the inside of the dome and practically hose it down to get rid of the dust. If you wet cut it you'll have a concrete slime swamp on your hands that you'll have to wet vac out and then mop the floor about a dozen times to get rid of the residue. Man this just bites, it's been one thing after another.
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Re: How not to build a pier footer!
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