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Deflectolator
Joist deflection calculator

Enter your floor joist information and then hit 'Calculate deflection' to find out your floor rating. Good Luck!

NOTE! This calculator is designed to work with dimensional lumber only! If you have engineered truss or I-beam type joists please do not use this calculator.

Joist Material
Joist Height
Joist Width
Joist Spacing on center
Joist Length feet



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