Joist count = ceil(deck width ft x 12 / spacing in) + 1. Standard deck joist spacing is 16 in OC (or 12 in OC for some decking materials).
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Joist count = ceil(deck width ft x 12 / spacing in) + 1. Standard deck joist spacing is 16 in OC (or 12 in OC for some decking materials).
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Steg-for-steg-guide
Enter Deck Width
Input the deck dimension running perpendicular to the joists, in feet.
Select Joist Spacing
Choose 16 in OC standard spacing, or 12 in OC as required by some composite decking products.
Get Joist Count
View the total number of joists needed across that span.
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