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Carpenter
Baluster Spacing
Baluster count and even gaps under the max-gap rule.
Common fall-through rule is under 125 mm.
Balusters
11
Even gap113.33 mm
Gaps12
Formula
gap = (rail length - balusters x width) / (balusters + 1)
(1800 - 11 x 40) / (11 + 1) = 113.33 mm
Each gap is 113.33 mm, at or under the 125 mm max-gap rule. Confirm against your local code.