In a nutshell, the distance the home must be raised to a reference point is determined using the level inside first. Starting from whatever reference point you've chosen, (usually the lowest corner), the home is jacked up and each pier block set is built up to the height necessary at that point.
Cribbing is a vital safety feature that should be used during the process. It is a structure built from timbers like railroad ties to provide a safety pocket for the techs in the event the home should fall off the jacks. Also, the jacks require a special metal socket that fits over the shaft and engages the I-beam. It minimizes the potential for the jack slipping out from under the beam under loading.
A water level under the home can also be used to gauge when the home is raised enough for that particular pier block set. We used a small builders level with a built in laser. Otherwise, a person inside the home must check the level frequently and tell the crew below what the progress status is. Not an easy process without handheld radios.
Be aware that there are HUD Code requirements regarding the height of pier blocks. The setup manual that came with the home originally should have all this laid out.
Again, I can't stress enough that this procedure isn't suitable for the untrained lay person, no matter how skilled. Every year this industry loses qualified techs to accidents during this operation.
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