Georgia-Pacific DryMax Moisture & Water-Resistant OSB Subfloor Plywood
Georgia-Pacific DryMax Subfloor Plywood, Moisture & Water-Resistant OSB
  • The most moisture-resistant sub-floor GP manufactures
  • 500-day no sand warranty
  • Designed to reduce moisture-related issues such as thickness and edge swell
Our most moisture-resistant OSB performs in every way.

DryMax® High-Performance OSB is not only the most moisture-resistant OSB sub-floor Georgia-Pacific manufactures, it’s also designed to help prevent costly and time-consuming joint sanding. No wonder DryMax® High-Performance OSB carries a 500-day no-sand warranty. It’s performance you can count on – day in and day out.

Enhanced durability, nail-holding ability, stiffness and strength

Clear edge seal helps prevent moisture intrusion

Single-layer flooring panel for use under hardwood flooring and carpet and pad

$2 per sheet first time user rebate


Available Sizes (Sized for 4’ x 8’)
Square Edge

3’-11 7⁄8” (1.216 m) x 7’-11 7⁄8” (2.435 m)

Tongue & Groove

3’-11 1⁄2” (1.206 m) x 7’-11 7⁄8” (2.435 m)

Building Code Performance Categories, Panel Thickness
19/32 CAT

0.578” (14.68 mm)

23/32 CAT

0.703” (17.85 mm)

Length/Width Tolerance

±1⁄16” (±1.6 mm

Straightness Tolerance

±1⁄16” (±1.6 mm)

Squareness Tolerance

± 1/8” (± 3.2 mm)

Testing Agency

APA® – The Engineered Wood Association


Exposure 1 : OSB suitable for uses not permanently exposed to the weather. Panels classified as Exposure 1 are intended to resist the effects of moisture on structural performance as may occur due to construction delays, or other conditions of similar severity.

Code Fire Classification

Class III or C

Flame Spread Rating

76-200, smoke developed index <450

Building Code Compliance

PS 2-10

SFI Certified


Safety Data Sheets

Product FAQs

What is Sturd-I-Floor®?

Sturd-I-Floor® is an APA designation that is a combination subfloor-underlayment produced from OSB or plywood. These panels feature a built-in underlayment that allows the convenience of using only Sturd-I-Floor® under certain finish flooring, especially carpet and pad.

What is a “no sand guarantee”?
What is the proper way to store OSB on the yard or on a job site?
Is there a difference between span ratings for OSB and plywood?
What is the flame spread classification for OSB?
What is the difference between Structural 1 and Exposure 1 panels?
Can you paint OSB?
Can OSB be used for outdoor projects?
What does the stamp on my OSB panel mean?
What does the "span rating" of an OSB panel mean?
How many sheets are in a unit of OSB?
Does GP's wood come from sustainably managed forests?
Do your panels meet formaldehyde emissions standards?
When used in the manufacture of crates and pallets, are Georgia-Pacific plywood and OSB safe for international shipping?

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