Long levels like these can be used to check for uneven
floor joist in your floor framing, before applying the plywood sheeting.
Simply place the level perpendicular to the floor joist as shown in the
picture above and start looking for high or low floor joist.
The high joist can be planed to down with an electric planer and a low
joist can be built up using wood shims or by nailing another floor joist
onto one side of the existing joist that's low, to raise it up.
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