Setting junction box height down from the ceiling

Electrical
Layout
Ceilings

Boxes dimensioned off the ceiling cannot be set from the floor, and on a masonry wall the floor is rarely level enough to fake it. Measuring down from the deck with the T1 Tomahawk and marking where the laser lands puts each box at the height the drawing asked for, and puts every box on the run at the same one. The line holds across the wall.

Why measure down, not up

Some boxes are dimensioned off the ceiling
Floors are rarely level enough to trust
T1 laser marks the height on the wall
Every box on the run matches
Works on block and masonry

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Some boxes are dimensioned off the ceiling rather than the floor, which is awkward on a masonry wall where the floor is not level anyway. Measuring down from the deck and marking where the laser lands puts the box at the height the drawing asked for, and puts every box on the wall at the same one.