english
français
Deutsch
Italiano
Русский
Español
português
Nederlandse
ελληνικά
日本語
한국
العربية
हिन्दी
Türkçe
indonesia
tiếng Việt
ไทย
বাংলা
فارسی
polski
For construction projects, plywood selection begins with two separate questions: what loads must the panel carry, and what moisture conditions will it experience? A panel may have a suitable bond classification but still be unsuitable for a particular span, load, support layout or structural application.
Identify whether the plywood is used for wall or roof sheathing, flooring, soffits, temporary protection, concrete formwork or another purpose. Each use has different requirements for structural rating, surface, thickness and exposure.
| Application | Key selection factors | Additional design checks |
|---|---|---|
| Roof sheathing | Structural rating, thickness, span rating, exposure | Support spacing, fasteners, roof underlay and weather protection |
| Wall sheathing | Panel grade, structural rating and exposure | Bracing design, fastening schedule and weather-resistive barrier |
| Flooring / subfloor | Stiffness, thickness, edge profile and moisture class | Joist spacing, point loads, floor finish and ventilation |
| Exterior soffit | Exterior bond, face grade and finish | Ventilation, drainage and coating maintenance |
| Concrete formwork | Film-faced specification and mechanical properties | Formwork pressure, support spacing and reuse handling |
APA explains that plywood span ratings identify maximum recommended support spacing for panels used in code-conforming construction. The appropriate thickness and span rating depend on the application and design requirements. Bond classification, strength, stiffness and span rating are different pieces of information.
This product page is a procurement guide, not a structural design. Obtain verified mechanical properties, span data and the applicable design standard before specifying panels for load-bearing use.
| Parameter | Project input | Supplier response |
|---|---|---|
| Application | Roof / wall / floor / soffit / formwork | Confirm product grade |
| Design load | Project engineer to define | Provide applicable design properties |
| Support spacing | Project drawing / engineer | Provide span rating where available |
| Thickness | As specified by design | Nominal and actual tolerance |
| Exposure class | Interior / Exposure 1 / Exterior / local equivalent | Product marking and documentation |
| Panel grade | Face/back and structural grade | Grade stamp / certificate |
| Dimensions | Length × width | Manufacturing tolerance |
Store panels flat on level supports, off the ground and protected from standing water. Keep bundles covered while allowing ventilation where appropriate. Follow the manufacturer's handling instructions and the project sequence so that temporary exposure does not become prolonged exposure. Seal cut edges and protect installed panels as required by the assembly design.
The USDA Forest Service's Wood Handbook discusses moisture content, dimensional changes and moisture control in wood products. These factors should be considered in storage, transport and construction planning.
Is Exposure 1 enough for permanent outdoor construction?
Does a waterproof rating mean the panel is structural?
Can I use one plywood grade for roofing, flooring and formwork?
These public sources support the general technical explanations on this page. They do not certify the specific product offered by any supplier. Product-specific claims must be supported by the relevant factory records, test reports and destination-market documents.
- APA – Plywood and bond classifications
- APA – Moisture Exposure Recommendations for Wood Structural Panels
- USDA Forest Service – Moisture content and dimensional changes
- ISO 12465:2007 – Plywood: Specifications
Before publishing, insert verified product parameters, company identity, named technical reviewer, current factory photos and applicable test/certification documents. Remove any claim that cannot be substantiated for the exact product and batch.
Need a plywood specification matched to your project?
Share the required thickness, panel size, core construction, exposure condition and destination market for a product-specific quotation.
