Given
Application joists in floor system Spacing 24 in. OC Load D = 15 psf
L = 185 psfType of panel APA rated sheathing Orientation strong direction
Deflection Limits (IBC table 1604.3)
L
(185 psf)D + L
(200 psf)Floor members L/360 L/240
Span Rating (Load-Span Tables for APA Structural-Use Panels)
APA rated plywood sheathing
Try a 48/24 with panel in strong direction.
L L/360 191 psf > 185 psf ✓ D + L L/240 286 psf > 200 psf ✓ Bending 1(194) psf > 200 psf ✘ Shear 1(267) psf > 200 psf ✓ ∴ None of the plywood sheathing panels will work.
APA rated OSB sheathing
Try a 48/24 with panel in strong direction.
L L/360 174 psf > 185 psf ✘ D + L L/240 260 psf > 200 psf ✓ Bending 1(208) psf > 200 psf ✓ Shear 1(222) psf > 200 psf ✓ ∴ None of the OSB sheathing panels will work.
APA rated plywood sturd-i-floor
Try a 32 OC with panel in strong direction.
L L/360 310 psf > 185 psf ✓ D + L L/240 465 psf > 200 psf ✓ Bending 1(219) psf > 200 psf ✓ Shear 1(347) psf > 200 psf ✓ ∴ A 32 OC span rating or larger oriented in strong direction would work.
APA rated OSB sturd-i-floor
Try a 32 OC with panel in strong direction.
L L/360 282 psf > 185 psf ✓ D + L L/240 423 psf > 200 psf ✓ Bending 1(219) psf > 200 psf ✓ Shear 1(267) psf > 200 psf ✓ ∴ A 32 OC span rating or larger oriented in strong direction would work.
Thickness (Panel Design Specification)
∴ A 7/8 in. thickness or larger would work.
Edge Support
According to APA's Engineered Wood Construction Guide, edge support, using tongue-and-groove or 2 in. lumber blocking, is recommended for sturd-i-floor. The use of underlayment is not assumed.
Conclusion
Minimum grade APA rated plywood
or OSB sturd-i-floor
without underlaymentSpan rating 32 OC Thickness 7/8 in. or greater Orientation strong direction Edge support recommended