Subfloor Plywood & OSB Sheathing Calculator
Calculate 4x8 tongue-and-groove (T&G) floor sheathing panels, structural subfloor adhesive cartridges, and code-compliant fastener schedules per IRC Table R602.3(1).
Room / Floor Framing Dimensions
ft
Length along 8-ft panel dimension.
ft
Width along joists.
Adhesive & Fastening Specifications
%
10% standard for rectangular rooms.
Subfloor Material Takeoff
IRC SPAN APPROVED (24" MAX)
4' x 8' T&G Sheets Required
14 Sheets
384 sq ft net (422 sq ft with 10% waste)
Subfloor Adhesive Tubes
4 Cartridges
28 oz tubes (304 lin ft of joist tops)
Total Fasteners Required
574 Screws
One 5 lb box (~600 screws)
IRC Fastener Spacing
6" Edge / 12" Field
Table R602.3(1) code schedule
Framing & Layout Specifications
Total Joist Line Runs:
19 joist runs (16-ft span)
Total Joist Glue Contact Length:
304 linear feet
Fasteners Per 4x8 Panel:
41 fasteners (16 edge + 25 field)
Panel Orientation & Stagger:
Perpendicular to joists, 48" offset
IRC Table R602.3(1) & APA Engineered Wood Standards
Residential Code
Panels must be installed with tongue-and-groove long edges perpendicular to joists, staggering short end joints by at least 24 inches (typically 48 inches). Leave a 1/8-inch expansion gap at all butt end joints to accommodate seasonal wood moisture expansion without buckling.