Deck Joist Calculator

DECKING v1.0

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).

Civil & Structural Engineering Tools

Inputs

Results

Deck Joists Needed
10 joists

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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Пошаговая инструкция

1

Enter Deck Width

Input the deck dimension running perpendicular to the joists, in feet.

2

Select Joist Spacing

Choose 16 in OC standard spacing, or 12 in OC as required by some composite decking products.

3

Get Joist Count

View the total number of joists needed across that span.

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Справка и база знаний

Часто задаваемые вопросы (10)

Ответы на популярные вопросы об этом инструменте.

Many composite decking manufacturers require tighter 12 in OC joist spacing (versus the 16 in OC standard for wood) — always check your product's span rating.
No — this counts interior field joists only; rim joists around the deck perimeter should be added separately.
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