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3-4-5 Tile Layout Method

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Determine point C at which the perpendicular is
needed
• Use a steel tape, strike an arc 3’ from point C toward
center of the room
• Measure 4’ from point C toward point B along line
AB (point E)
• Strike an arc 5’ from point E toward the center of the
room, intersecting the first arc
• Strike a chalk line through points C and D. Line CD
is the desired perpendicular

A simple way of checking the accuracy of the points plotted by
this method is to measure 4' from point C toward point A on
line AB. Using this new point as a base, strike another arc 5' out
in the direction of the recently established point D. This new arc
should intersect the junction of the original two arcs. If it does not,
replot all points to find and correct the error. In large rooms, the
3-4-5 method may be expanded by using any multiples of these
measurements, such as 6-8-10 or 9-12-15.
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