How do you square a floor layout line off a speed square?

Flooring
Layout
Accuracy

Every row of tile or plank inherits the first line, so an out-of-square start compounds until it is visible at the far wall. Running the T1 Tomahawk's laser along a speed square gives a square reference you can see, rather than a pencil line you hope is right. Check the square itself first, because that error propagates just as far.

Why the first line decides the rest

Every row inherits the first line
T1 laser runs along the square's edge
Mark where the dot lands, not a guess
A visible reference beats a faint line
Check the square itself before trusting it

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Floor layout only works if the first line is genuinely square, because everything after it inherits the error. Setting the speed square, running the laser along its edge and marking where the dot lands gives you a square reference you can see, rather than a pencil line you hope is right. Check the square before you trust it.