Plywood Sizes & Thickness

Every standard plywood size, the nominal vs actual thickness gap, sheet formats by type, span ratings, application specification charts, dado sizing,...

Every standard plywood size, the nominal vs actual thickness gap, sheet formats by type, span ratings, application specification charts, dado sizing, and the measurements that prevent expensive mistakes at the lumber yard or job site.

Plywood sizing looks simple until you’re standing at the lumber yard trying to figure out why your ‘3/4-inch’ sheet actually measures 23/32”, why Baltic birch comes in a different sheet format than everything else, and whether the 1/2” panel you’re looking at is the right thickness for a 24-inch joist span. These aren’t trivial details the gap between nominal and actual dimensions affects every dado joint you cut, every span calculation you make, and every cut list you build.

This guide covers everything: standard sheet dimensions, the full nominal-to-actual conversion chart, Baltic birch metric equivalents, thickness requirements by application, special sheet formats, span rating interpretation, and dado sizing for precise joinery.

Standard Plywood Sheet Sizes: Complete Format Guide

The 4×8 sheet is so dominant in North American construction that many builders assume it’s the only plywood format. Knowing the alternatives prevents yield calculation errors and specification mistakes when ordering imported panel products.

THE STANDARD 4×8 SHEET

The 4×8 (48” × 96”) sheet is the North American construction standard, designed to align with 16-inch and 24-inch on-center framing. Actual dimensions are typically 47.5” × 95.5” slightly undersized to account for mill variation and installation ease. This reduction is standard and consistent across virtually all 4×8 products.

MASTER SHEET FORMAT REFERENCE CHART

Format	Nominal Dimensions	Actual Dimensions	Area (sq ft)	Common Products
4×8 (Standard)	48” × 96”	47.5” × 95.5”	32.0	CDX, ACX, BCX, OSB, MDO, domestic birch, hardwood ply
5×5 (Baltic Birch)	60” × 60”	59.75” × 59.75”	25.0	Baltic birch (all grades — B/B, B/BB, B/CP, CP/CP)
4×10	48” × 120”	47.5” × 119.5”	40.0	Specialty plywood; some marine grade; long panel use
5×10	60” × 120”	~same	50.0	Baltic birch specialty; large CNC; boat building panels
4×4 (half sheet)	48” × 48”	47.5” × 47.5”	16.0	Retail convenience; cut-down standard sheets
2×4 (quarter sheet)	24” × 48”	23.75” × 47.5”	8.0	Small retail projects; usually cut to order
5×5 Half Sheet	60” × 30”	~same	12.5	Baltic birch at some specialty dealers
Metric 2440×1220mm	~4×8 equivalent	2440×1220mm	32.0	European imports; effectively same as 4×8

THE 5×5 SHEET: WHY BALTIC BIRCH IS DIFFERENT

Baltic birch is manufactured in Russia and the Baltic states to metric standards. The sheet is 1525mm × 1525mm approximately 60 inches square. This format suits European furniture manufacturing where square panels minimize waste for symmetrical component cutting.

The critical consequence: a cut list designed for 4×8 sheets does not transfer directly to 5×5 Baltic birch. The square format sometimes provides better yield for cabinet parts (shorter components that fit across the 60” dimension) and sometimes worse yield (long panels that need the full 96” of a 4×8). Always run your cut list through optimization software for both formats before ordering.

5×5 YIELD COMPARISON

A standard 23.25” × 34.5” base cabinet side: On a 4×8, you get 2 sides across the 48” dimension. On a 5×5 (60”), you sometimes fit 2 sides with less waste. For base cabinet bottom panels at 21” × 23.25”, the 5×5 often produces better yield because more parts fit across the 60” row. Run both layouts before committing to an order.

Nominal vs Actual Thickness: The Complete Conversion Chart

The most practically important sizing fact for cabinetry and precision woodworking: plywood is sold at nominal thickness and arrives at actual thickness. These are never the same number. The difference is consistent and predictable but if you ignore it, every dado joint you cut will be either too tight or too loose.

WHY THE GAP EXISTS

Plywood nominal sizes were standardized historically when manufacturing tolerances were wider. The actual thickness also reflects sanding: panels are sanded to a consistent surface after pressing, removing a predictable amount of material. The result is a consistent 1/32” reduction from nominal at most standard thicknesses.

MASTER NOMINAL VS ACTUAL CHART - NORTH AMERICAN SOFTWOOD PLYWOOD

Nominal	Actual (inches)	Actual (fraction)	Actual (mm)	Tolerance (±)	Notes
1/8”	0.106”	~7/64”	2.7mm	±0.012”	Very thin; handle carefully
1/4”	0.218”	~7/32”	5.5mm	±0.012”	Cabinet backs, drawer bottoms
3/8”	0.344”	~11/32”	8.7mm	±0.016”	Light sheathing, door backs
1/2”	0.469”	~15/32”	11.9mm	±0.016”	Drawer sides, upper cabinet boxes
5/8”	0.594”	~19/32”	15.1mm	±0.016”	Roof sheathing at 24” o.c.
3/4”	0.719”	~23/32”	18.3mm	±0.020”	Cabinet boxes, shelves, subfloor
1”	0.969”	~31/32”	24.6mm	±0.020”	Heavy structural, worktops
1-1/8”	1.094”	~1-3/32”	27.8mm	±0.020”	Sturd-I-Floor 48 OC subfloor

THE 1/32” RULE

North American softwood plywood is consistently 1/32” thinner than its nominal dimension. A ‘3/4 inch’ sheet is 23/32”. A ‘1/2 inch’ sheet is 15/32”. A ‘1/4 inch’ sheet is 7/32”. Always measure your actual panel with a dial or digital caliper before cutting dadoes, rabbets, or any joint that must fit the panel precisely. A tape measure cannot reliably resolve 1/32” differences.

BALTIC BIRCH METRIC THICKNESS CHART

Baltic birch uses metric thicknesses that do not correspond exactly to North American nominal sizes. Mixing Baltic birch with domestic plywood on the same project creates a second source of thickness variation that must be accounted for in joinery.

Baltic Birch Metric	Actual (mm)	Actual (inches)	Ply Count	Difference vs NA 3/4” actual
3mm	3.0mm	0.118”	3	Thicker than NA 1/8” actual (0.106”)
6mm	6.0mm	0.236”	5	Thicker than NA 1/4” actual (0.218”) by 0.018”
9mm	9.0mm	0.354”	7	Thicker than NA 3/8” actual (0.344”) by 0.010”
12mm	12.0mm	0.472”	9	Slightly thicker than NA 1/2” actual (0.469”)
15mm	15.0mm	0.591”	11	Slightly thinner than NA 5/8” actual (0.594”)
18mm	18.0mm	0.709”	13	0.010” thinner than NA 3/4” actual (0.719”)
21mm	21.0mm	0.827”	15	Between NA 3/4” and 1” — no NA equivalent
25mm	25.0mm	0.984”	17	Slightly thicker than NA 1” actual (0.969”)

THE 18MM VS 23/32” JOINERY PROBLEM

This is the most common dado failure when mixing Baltic birch and domestic plywood. 18mm Baltic birch = 0.709”. North American 3/4” actual = 0.719”. Difference: 0.010” (0.25mm). Small enough to be invisible to the eye — large enough to make a dado sized for one panel too tight or too loose for the other. Always measure your actual panels and cut dadoes to the measured dimension, not any nominal value.

Plywood Thickness by Application: The Specification Charts

Selecting the correct thickness involves structural requirements (span, load), surface quality requirements, and dimensional compatibility. Use these charts as field-ready specification references.

CONSTRUCTION APPLICATIONS THICKNESS CHART

Application	Min Thickness	Preferred Thickness	Framing Spacing	Span Rating	Notes
Roof sheathing	1/2” (15/32”)	1/2”	16” o.c.	32/16	H-clips at unsupported edges
Roof sheathing	5/8” (19/32”)	5/8”	24” o.c.	48/24	H-clips at unsupported edges
Wall sheathing	3/8” (11/32”)	1/2”	16” o.c.	24/16	1/2” preferred for shear walls
Wall sheathing	1/2” (15/32”)	1/2”	24” o.c.	24/0 or 32/16	Check engineer’s shear wall schedule
Subfloor	3/4” T&G (23/32”)	3/4” T&G	16” o.c.	Sturd-I-Floor 20 OC	Glue and nail; CDX or Sturd-I-Floor
Subfloor	3/4” T&G (23/32”)	3/4” T&G	19.2” o.c.	Sturd-I-Floor 20 OC	Sturd-I-Floor 20 OC minimum
Subfloor	7/8” or 1”	1”	24” o.c.	Sturd-I-Floor 24 OC	Heavier spec; under tile/stone at 24”
Concrete forming	3/4” CDX	3/4” MDO	N/A	N/A	CDX 2–3 uses; MDO 5+ uses
Siding (T1-11)	19/32” (structural)	19/32” or 5/8”	16” o.c.	Rating varies	Combined sheathing + siding
Underlayment	1/4”	3/8” over rough subfloor	N/A	N/A	Smooth face over structural subfloor

CABINET AND FURNITURE THICKNESS CHART

Component	Standard Thickness	Material Spec	Max Span	Notes
Cabinet box sides	3/4” (18mm)	Baltic birch B/BB or maple plywood	N/A — enclosed box	Void-free critical for hinge screws
Cabinet back panel	1/4” (6mm)	Baltic birch or birch plywood	N/A — dadoed in	Dadoed 1/4” into sides; gives rigidity
Cabinet top & bottom	3/4” (18mm)	Same as sides	24” max unsupported	Supported by box sides in assembly
Drawer box sides	1/2” (12mm)	Baltic birch B/BB	N/A — box construction	Void-free essential for dovetail joints
Drawer box back	1/2” (12mm)	Baltic birch B/BB	N/A	Same as sides
Drawer bottom	1/4” (6mm)	Baltic birch or birch plywood	N/A — dadoed in	Floats in dado groove; does not bear load
Shelf (under 24” span)	3/4” (18mm)	Plywood or Baltic birch	24”	Adequate for most kitchen loads
Shelf (24”–36” span)	3/4” + solid front edge	Plywood + solid wood	36”	Front edge prevents sag under load
Shelf (over 36” span)	1” or torsion box	Thick plywood or engineered	40”+	Torsion box for long lightweight spans
Door panel (painted)	1/4” center panel	MDF in solid wood frame	N/A — frame restrains	Smooth MDF takes paint better than ply
Door panel (stained)	1/4” center panel	Hardwood veneer plywood	N/A — floats in frame	Panel must float to allow wood movement
Countertop substrate	3/4” × 2 layers	Exterior-rated plywood	Cabinet-supported	Double layer = 1-1/2” under stone
Furniture carcass sides	3/4” (18mm)	Baltic birch B/BB	N/A — box structure	Exposed edges are design feature
Workbench top	3/4” double layer	Baltic birch or hardwood ply	36”	1-1/2” total; resists impact loads
Speaker box walls	3/4” (18mm)	Baltic birch B/BB	N/A — enclosed box	Void-free eliminates acoustic coloration
CNC substrate	3/4” (18mm)	B/BB or CP/CP Baltic birch	N/A	Consistent density for uniform cutting

Sheet Weight, Area & Coverage: Quick Reference Charts

WEIGHT CHART - STANDARD SOFTWOOD PLYWOOD (4×8 SHEETS)

Panel weight affects handling safety, structural dead load calculations, and shipping costs. These are approximate weights for standard softwood CDX/Southern Yellow Pine plywood. Hardwood plywood, Baltic birch, and MDO vary.

Nominal Thickness	Actual (inches)	Sheet Weight (4×8)	Weight/Sq Ft	Handling Note
1/4”	7/32”	22–27 lbs	0.70–0.85 lbs	One-person OK for short distances
3/8”	11/32”	28–36 lbs	0.90–1.10 lbs	One-person; two for overhead work
1/2”	15/32”	40–48 lbs	1.25–1.50 lbs	Two-person recommended
5/8”	19/32”	48–60 lbs	1.50–1.90 lbs	Two-person required
3/4”	23/32”	60–75 lbs	1.90–2.35 lbs	Two-person; panel carriers helpful
1”	31/32”	80–95 lbs	2.50–3.00 lbs	Mechanical assist for large quantities
1-1/8”	1-3/32”	90–110 lbs	2.80–3.40 lbs	Panel cart or forklift for stacks

BALTIC BIRCH WEIGHT NOTE

Baltic birch’s all-birch, void-free, high-ply-count construction is denser than comparable softwood plywood. A 3/4” (18mm) Baltic birch 5×5 sheet weighs approximately 55–68 lbs roughly comparable per square foot to CDX at the same thickness despite the smaller sheet format. Factor this into material handling plans for large cabinet shop orders.

SHEET COUNT ESTIMATOR

Project	Square Footage	4×8 Sheets (+ 10% waste)	5×5 Sheets (+ 10% waste)	Notes
1,000 sq ft roof	1,000 sq ft	~35 sheets	N/A - use 4×8	CDX 1/2”; add 10–12% for gable waste
1,500 sq ft subfloor	1,500 sq ft	~52 sheets	N/A - use 4×8	CDX 3/4” T&G; add 10% waste
2,000 sq ft walls	2,000 sq ft	~69 sheets	N/A - use 4×8	Add 10% for openings and cuts
10 base cabinets	~60 sq ft box material	~2 sheets 3/4” + 1 sheet 1/4”	~2.5 sheets 3/4” + 1.5 sheets 1/4”	Varies with dimensions
20 cabinets (full kitchen)	~120 sq ft	~4 sheets 3/4” + 2 sheets 1/4”	~5 sheets 3/4” + 3 sheets 1/4”	Rough; optimize with cut list software
Bookcase 72” × 36”	~40 sq ft	~1.5 sheets 3/4”	~2 sheets 3/4”	Baltic birch uses more sheets (smaller format)
Speaker enclosure (pair)	~15 sq ft	~0.5 sheets 3/4”	~0.7 sheets 3/4”	One 4×8 sheet typically covers a pair

APA Span Ratings Explained: Reading the Panel Stamp

Every APA-rated structural panel carries a span rating stamped on its face. Misreading the span rating or installing panels in the wrong orientation is one of the most common structural errors in residential construction.

HOW TO READ THE SPAN RATING

The span rating appears as two numbers separated by a slash, for example 32/16 or 48/24. The first number is the maximum rafter or framing spacing in inches for roof sheathing. The second number is the maximum joist spacing in inches for subfloor use.

Example: A panel stamped 48/24 can span 48-inch rafter spacing for roofing and 24-inch joist spacing for flooring. A panel stamped 32/16 can span 32-inch rafter spacing and 16-inch joist spacing.

SPAN RATING REFERENCE CHART

Span Rating	Nominal Thickness	Roof Rafter Max	Floor Joist Max	Typical Product
24/0	3/8”	24”	Not rated for floor	Wall sheathing only; 0 means not for subfloor
24/16	3/8”–1/2”	24”	16”	Lighter construction; less common
32/16	15/32”–1/2”	32”	16”	Most common residential roof sheathing spec
40/20	19/32”–5/8”	40”	20” (19.2”)	Wider rafter spacing or heavier loads
48/24	19/32”–5/8”	48”	24”	Wide rafter/joist spacing; larger panels
Sturd-I-Floor 16 OC	19/32”–3/4”	N/A — floor only	16”	Single-layer subfloor panel; T&G
Sturd-I-Floor 20 OC	19/32”–3/4”	N/A	19.2” or 20”	Standard residential subfloor spec
Sturd-I-Floor 24 OC	23/32”–3/4”	N/A	24”	Wider joist spacing; common in engineered lumber
Sturd-I-Floor 48 OC	1-1/8”	N/A	48”	Open-web truss or I-joist spacing
Structural 1 rated	Per thickness	Higher values	Higher values	Group 1 species; seismic/high-wind use

PANEL ORIENTATION RULE — NON-NEGOTIABLE

Span ratings assume the panel’s long dimension (8-foot direction on a 4×8 sheet) runs perpendicular to framing members. Installing panels with the grain parallel to framing effectively cuts the span rating in half. Roof panels go across rafters, not along them. Subfloor panels go across joists. This is also why Baltic birch in 5×5 format is not used for structural sheathing the square format doesn’t have an inherent orientation advantage in one direction.

Special Plywood Formats: T&G, Structural 1, Fire-Rated & Siding

TONGUE-AND-GROOVE (T&G) PANELS

T&G plywood has milled interlocking edges that connect adjacent panels one panel’s tongue slides into the neighboring panel’s groove. This connection eliminates edge gaps between panels, prevents differential edge movement that causes floor squeaking, and transfers some load across the joint.

Primary use: 3/4” subfloor (the residential standard for 16-inch and 19.2-inch joist spacing)
Available thicknesses: 3/4” (most common); 1-1/8” for 48-inch o.c. beam spacing
Installation note: T&G edges must be driven together snugly during installation. Gaps in T&G joints defeat the purpose of the profile. Use a scrap block and hammer or rubber mallet to drive joints closed before nailing.
Field cut warning: Any partial panel cut at a wall eliminates either the tongue or groove at the cut edge. The resulting square edge must be properly supported by a joist directly below.

STRUCTURAL 1 (STR 1) PANELS

APA Structural 1 panels are manufactured with Group 1 wood species the highest-strength classification — for all plies, delivering higher allowable shear design values than standard rated sheathing at the same thickness.

When it’s required: Engineering drawings for structures in high-wind zones (ASCE 7 Exposure C and D categories) or high-seismic zones (SDC D, E, F) frequently specify Structural 1 sheathing. Never substitute standard CDX for Structural 1 on an engineered shear wall without written approval from the engineer of record.

PLYWOOD SIDING PANELS (T1-11 AND SIMILAR)

Plywood siding panels are 4×8 or 4×9 exterior-rated panels with factory-applied textured profiles on the face veneer. The Texture 1-11 (T1-11) profile has vertical grooves every 4 or 8 inches. Available in 3/8” (sheathing only, not for use without structural backing) and 19/32” or 5/8” (combined structural sheathing and siding in one layer — the correct specification for most residential use).

UNDERLAYMENT PANELS

Plywood underlayment panels are 4×4 or 4×8 sheets in 1/4” or 3/8” thickness with smooth, sanded, minimal-defect faces. They are installed over structural subfloor to provide a smooth base for resilient flooring (vinyl, LVP, linoleum). Underlayment is not structural — never substitute it for structural subfloor panels or confuse it with structural sheathing.

Dado Sizing Chart: Cutting Joints for Actual Panel Thickness

Dado joints must be cut to the actual measured thickness of the panel being inserted, not the nominal. This is the most immediate, visible consequence of the nominal vs actual gap a dado sized to nominal 3/4” will be too wide for an actual 23/32” panel.

STANDARD DADO WIDTH SETTINGS BY PANEL

Panel (Nominal)	Actual Thickness	Dado Width Setting	Baltic Birch Equivalent	Notes
1/4” NA plywood	0.218” (7/32”)	7/32”	6mm BB = 0.236” — different!	Set up fresh for each panel type
3/8” NA plywood	0.344” (11/32”)	11/32”	9mm BB = 0.354” — slightly wider	Verify with caliper before production
1/2” NA plywood	0.469” (15/32”)	15/32”	12mm BB = 0.472” — nearly same	Check fit with scrap before production
3/4” NA plywood	0.719” (23/32”)	23/32”	18mm BB = 0.709” — narrower	Critical difference for cabinet dado joints
6mm Baltic birch	0.236”	6mm or 15/64”	N/A — this is BB	Different from NA 1/4” actual
12mm Baltic birch	0.472”	12mm or 15/32”	N/A — this is BB	Very close to NA 1/2” actual
18mm Baltic birch	0.709”	18mm or 45/64”	N/A — this is BB	Narrower than NA 3/4” actual by 0.010”

THE TEST DADO METHOD

Set your dado stack or router bit to what you believe is correct. Cut a test dado in a scrap piece of the same material you’re working with. Test the fit with the actual panel that will slide into the dado. A correct fit: the panel slides in and out by hand without force and without visible side-to-side play. Too tight: excessive force required (risk of splitting on assembly and binding during wood movement). Too loose: visible gap, poor load transfer, joint telegraphs through finished surface.

Cabinet Box Dimensions: How Plywood Thickness Affects Interior Size

Cabinet construction uses plywood in precisely specified ways where the panel thickness directly determines the interior usable dimensions, drawer slide compatibility, and hardware alignment.

STANDARD CABINET OUTER DIMENSIONS

Cabinet Type	Overall Height	Width Range	Overall Depth	Box Plywood Thickness
Base cabinet (standard)	34.5” box + 1.5” top = 36” finished	9” to 48” in 3” increments	24” nominal	3/4” (18mm)
Wall cabinet (standard)	12”, 15”, 18”, 30”, 36” options	9” to 48”	12” nominal	3/4” (18mm)
Pantry / tall cabinet	84”, 90”, or 96”	12” to 36”	24” or 12”	3/4” (18mm)
Drawer base cabinet	34.5”	15” to 36”	24” nominal	3/4” box; 1/2” drawer sides
Filler panel	Match adjacent cabinet height	1.5” to 6” typical	Flush to adjacent	3/4” solid panel or scribed

INTERIOR DIMENSION CALCULATION

The interior usable dimension of any cabinet box is the outer dimension minus the plywood thickness on opposing sides. For a 24-inch nominal depth base cabinet built with 3/4” (actual 23/32” = 0.719”) plywood:

Outer depth: 24” nominal
Interior depth: 24” − (back panel 1/4”) − (face frame or door reveal) = approximately 22.25” to 22.5” interior usable depth
Interior width: Outer width − (2 × 0.719”) = outer width − 1.438” (approximately 1-7/16”)

This is why drawer slides must be selected to match the actual interior cabinet opening, not the nominal box size. A 24-inch outer cabinet with 3/4” sides has an interior opening of approximately 22.56 inches — specify drawer slides for the actual measured interior, not 24 inches.

SHAKER CABINETS STANDARD CONSTRUCTION

At Shaker Cabinets, all box construction uses 3/4” void-free plywood with the standard interior dimension reductions that result from quality plywood box construction. All cabinets are KCMA certified for load, cycle, heat, and moisture performance. For precise interior dimension specifications on any cabinet in our line, contact our team. Interior dimensions are published in our specification sheets for drawer slide compatibility and interior accessory selection.

Plywood Sizing at the Lumber Yard: What to Check Before You Buy

Knowing the specifications is one thing. Verifying the actual panels at the point of purchase is the step that prevents arriving at the job site with the wrong material.

THE FIVE-POINT PANEL INSPECTION

Measure actual thickness with a caliper. Don’t assume the nominal. Stack variation means individual sheets can vary by up to ±1/32” from the average. For precision cabinetry, measure a sample from the middle of the stack, not just the top sheet.
Check for flatness. Set the panel on a flat surface (or hold it up to a reference edge) and check for cup or bow. More than 1/8” of bow across the 8-foot dimension will cause problems in cabinet assembly and panel joinery. Reject visibly bowed sheets.
Verify the APA stamp. For structural applications, confirm the span rating, exposure classification, and panel grade on the stamp or end tag. Unstamped panels cannot be verified and should not be used in structural applications.
Inspect the edge. Cross-cut a small piece if possible, or examine panels that have factory-ripped edges. Look for void count and size in the inner plies. This tells you immediately whether you’re getting CDX-grade voids or a higher-quality void-free panel.
Confirm the sheet format. 4×8 vs 5×5 (Baltic birch) vs 4×9 (siding) panels look nearly identical on a stacked pallet. Always confirm the sheet dimensions before loading panels into your vehicle or accepting a delivery.

Frequently Asked Questions

What is the standard plywood sheet size?

The standard North American plywood sheet is 4 feet by 8 feet (48” × 96”), with actual dimensions of approximately 47.5” × 95.5”. Baltic birch plywood is the major exception it is manufactured in 5×5-foot (60” × 60”) sheets. Specialty formats include 4×10, 5×10, and 4×4 half sheets for specific applications. Most construction plywood comes in 4×8.

Why is 3/4 inch plywood actually 23/32 inch?

Plywood is sold at nominal (marketing) thickness, but the actual manufactured dimension is consistently 1/32” thinner due to sanding during manufacturing. This is standardized and consistent: 3/4” nominal = 23/32” actual (0.719”); 1/2” nominal = 15/32” actual; 1/4” nominal = 7/32” actual. Always measure the actual panel with a caliper before cutting dadoes or sizing joints to nominal dimensions.

What size plywood for cabinet boxes?

3/4” (18mm) plywood for box sides, top, and bottom Baltic birch B/BB or maple plywood for quality builds; sande or domestic birch for painted economy cabinets. 1/4” (6mm) for cabinet back panels (dadoed into sides). 1/2” (12mm) Baltic birch for drawer box sides. 1/4” (6mm) for drawer bottoms. All structural box components must be void-free plywood for reliable hinge screw, fastener, and shelf pin performance.

How many square feet in a sheet of plywood?

A standard 4×8 sheet of plywood covers 32 square feet (48 inches × 96 inches ÷ 144 square inches per square foot = 32 sq ft). A 5×5 Baltic birch sheet covers 25 square feet (60” × 60” ÷ 144 = 25 sq ft). A 4×10 sheet covers 40 square feet. When calculating material quantities, always add 10–15% for waste and cuts.

What is T&G plywood and when do I need it?

T&G (tongue-and-groove) plywood has milled interlocking edges that connect adjacent panels without gaps. The tongue on one panel’s edge fits into the groove on the next panel’s edge. T&G is primarily used for subfloor installation — it eliminates the gaps between panels that allow edge differential movement causing floor squeaking and surface ridging under finish flooring. The standard residential subfloor specification is 3/4” T&G CDX or Sturd-I-Floor plywood on joists 16 to 24 inches on center, glued and nailed.

What is a span rating on plywood?

The APA span rating is two numbers separated by a slash stamped on structural panels, such as 32/16 or 48/24. The first number is the maximum rafter spacing in inches for roof sheathing use. The second number is the maximum floor joist spacing in inches for subfloor use. A panel rated 32/16 can span 32 inches between roof rafters and 16 inches between floor joists. Always install with the panel’s long dimension (8-foot direction) perpendicular to the framing members.

What thickness plywood for shelves?

3/4” (23/32” actual) plywood for shelves spanning up to 24 inches without support. For spans of 24 to 36 inches, add a 3/4” solid wood front edge to stiffen the shelf against sag. For spans over 36 inches, use 1-inch plywood or a torsion box construction. Avoid MDF for unsupported shelves over 24 inches MDF deflects measurably under load at standard 3/4” thickness and does not recover to its original flat position after sustained loading.

Does Baltic birch come in 4x8 sheets?

No. Baltic birch is manufactured in 5×5-foot (60” × 60”) metric sheets — not the North American 4×8 format. Some importers offer 4×8 cuts of Baltic birch as a special order, but these are non-standard and not universally available. Most specialty hardwood dealers and woodworking supply stores stock Baltic birch in the 5×5 format only. Always confirm the sheet size before ordering, as a cut list designed for 4×8 sheets has different yield than the same parts cut from 5×5 format.