Construction
Floor Joist Calculator
Room width by length plus joist spacing give joist count.
Joists needed
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- Header joists (rim)
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- Total linear feet
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- Blocking pieces
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FAQ
16 inch vs 24 inch OC? +
16 inch is standard for most floor loads. 24 inch is allowed with heavier joists or engineered I-joists.
Rim joists? +
Two rim joists (one on each end) box in the field joists and tie the floor together.