Deck Ledger Fastener Spacing Calculator

Inputs

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Deck width carried by the ledger. For joists spanning from ledger to beam, this is often half the joist span.
ft
Uniform live load on the deck area tributary to the ledger. Default is an example only.
psf
Uniform dead load on the deck area tributary to the ledger.
psf
Multiplier applied to live plus dead line load before spacing is calculated. Use 1.0 when your load and allowable basis already include the needed factors.
Entered allowable load per ledger fastener in the checked load direction. Use project-specific fastener or connector data.
lbf
Number of fasteners sharing load at each repeated spacing interval, such as one row or two staggered rows.
fasteners
Maximum spacing cap you want the calculator to enforce before reporting the governing spacing.
in
Candidate ledger fastener spacing to compare with the calculated limit and spacing cap.
in

Results

Default result
Edit inputs
Governing max spacing(s_max)
24in
Pass

Governing limit: entered maximum spacing cap.

Minimum of fastener-capacity spacing and entered spacing cap.

Also computed

Checked-spacing utilization(U_max)Pass0.6667

Utilization at the entered checked spacing.

Spacing from fastener allowable(s_F)24in

s = n*F_allow / (w*K_d).

Fastener-load utilization(U_F)0.6667

Spacing-cap utilization(U_cap)0.6667

Ledger line load(w)300lb/ft

Area load multiplied by tributary deck width.

Factored demand line load(w_d)300lb/ft

Method notes 4 notes
  • Ledger line load is (live area load + dead area load) multiplied by tributary deck width.
  • Spacing from fastener allowable uses s = n*F_allow/(w*K_d), then the entered maximum spacing cap is applied.
  • Enter allowable fastener load from the actual fastener, ledger, rim/band joist, sheathing, edge distance, corrosion condition and adopted design basis.
  • Does not embed IRC/AWC deck ledger tables, lateral-load connector rules, uplift, withdrawal, bolt/screw group effects, flashing/waterproofing, decay, masonry/concrete anchorage, inspection or permit approval.

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