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mikeholczer t1_je28hmz wrote on March 28, 2023 at 9:46 PM

They don’t build the second floor perpendicular to the first floor walls, they independently make sure each floor is level and each wall is plumb.

segelnhoch3 t1_je296t6 wrote on March 28, 2023 at 9:50 PM

To add onto this: there are tools that project perfectly vertical or horizontal lines with lasers, which you can then use to build your wall/floor/...