Georgia-Pacific Blue Ribbon OSB Roof Sheathing
Georgia-Pacific Blue Ribbon OSB Sheathing

Blue Ribbon® OSB Roof Sheathing

  • Span and exposure rated sheathing with dimensional stability
  • No core voids, knots or splits
  • Quality base layer for roof sheathing applications

Blue Ribbon® OSB sheathing panels contain no core voids, knots or splits and provide a quality base layer for wall and roof sheathing applications. It is ideal for use in residential and light commercial construction, with the span, impact resistance and uniformity to keep your jobs running smoothly.

Blue edge seal helps prevent moisture intrusion

Can also be used in wall sheathing applications

Available in 8’, 9’ and 10’ lengths


Available Sizes (Mills 451, 475, 500, 530)
Square Edge

3′-11 7⁄8″ (1.216 m) x 7′-11 7⁄8″ (2.435 m) – sized for 4′ x 8′

Tongue & Groove

3′-11 1⁄2″ (1.206 m) x 7′-11 7⁄8″ (2.435 m) – sized for 4′ x 8′

Available Sizes (Mills 531, 532)
Square Edge

3′-11 13⁄16″ (1.162 m) x 7′-11 7⁄8″ (2.435 m) – sized for 4′ x 8′

3′-11 13⁄16″ (1.162 m) x 8′-11 7⁄8″ (2.740 m) – sized for 4′ x 9′

3′-11 13⁄16″ (1.162 m) x 9′-11 7⁄8″ (3.044 m) – sized for 4′ x 10′

Tongue & Groove

3′-11 1⁄2″ (1.206 m) x 7′-11 7⁄8″ (2.435 m) – sized for 4′ x 8′

3′-11 1⁄2″ (1.206 m) x 8′-11 7⁄8″ (2.740 m) – sized for 4′ x 9′

3′-11 1⁄2″ (1.206 m) x 9′-11 7⁄8″ (3.044 m) – sized for 4′ x 10′

Building Code Performance Categories, Panel Thickness
7/16 CAT

0.418″ (10.61 mm)

15/32 CAT

0.451″ (11.45 mm)

1/2 CAT

0.483″ (12.26mm)

19/32 CAT

0.578″ (14.68 mm)

23/32 CAT

0.703″ (17.85 mm)

7/8 CAT

0.849″ (21.56 mm)

1-1/8 CAT

1.091″ (27.71 mm)

Length/Width Tolerance

± 1/16” (± 1.6 mm)

Straightness Tolerance

± 1/16” (± 1.6 mm)

Squareness Tolerance

± 1/8” (± 3.2 mm)


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 the proper way to store OSB on the yard or on a job site?

Whenever possible, store panels under a roof. Keep sanded panels and appearance-grade products away from high-traffic areas to prevent damage to surfaces. Use pieces of lumber to weigh down the top panel in a stack to reduce warpage from humidity. If moisture absorption is expected, cut steel bands on bundles to prevent edge damage.

If panels must be stored outside, stack them on a level platform supported by at least three 4x4s to keep them off the ground. Place one 4×4 in the center and the other two 4x4s 12 to 16 inches from the ends. Never leave panels or the platform in direct contact with the ground.

Cover the stack loosely with plastic sheets or tarps. Anchor the covering at the top of the stack, but keep it open and away from the sides and bottom to ensure good ventilation. Tight coverings prevent air circulation and when exposed to sunlight, may promote mold or mildew. (Source: APA Builder Tip U450: Storage and Handling of APA Trademarked Panels)

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?