LP FlameBlock

Meet Code. Exceed Expectations.

Image courtesy of KTGY Group and Avalon Bay

A Single Fire-Rated Panel
That Allows You To Do More With Less

LP® FlameBlock® Fire-Rated OSB Sheathing is ICC-certified to meet code and provides additional value—strength, savings and greater design flexibility. It helps you build fire-rated wall assemblies and roof deck faster—at a lower cost—than most common alternatives.

View Brochure

Code Approved

  • ICC-certified (ESR-1365)
  • Class A and 30-Minute Flame Spread Rating (ASTM E84, UL 723)
  • Combines flame-spread resistance and burn-through resistance
  • 15-Minute Thermal Barrier Protection (UBC 26-2)
  • Component of fire-rated interior and exterior wall assemblies and roof decks
  • Exposure 1 classification; withstands normal exposure to moisture during construction

Learn More

Interested in purchasing LP® FlameBlock® Fire-Rated OSB Sheathing?

Find out where to buy
Video Still

Installation Instruction Video for UL No. U350B Wall Assembly

This animated video provides a side-by-side comparison showing how the U350B wall assembly featuring LP® FlameBlock® Fire-Rated OSB Sheathing installs faster and easier than traditional shaft wall. On average, U350B assemblies save 4 inches of floor space per 4-foot wall compared to shaft wall.

View More Videos

Burton Lumber Wins Major Multifamily Bid in Utah, Introduces the New Product to a Full Team


LP® FlameBlock® Fire-Rated Sheathing was used in a UL-listed 349 wall assembly in a 2-hour fire-rated wall for a senior living center called Summit Vista. After being trained on the benefits of LP FlameBlock sheathing, team members from Utah-based Burton Lumber played integral roles to ensure that all partners—including the builder, code official and framer—were comfortable with the product and understood its value.

Read More
Wall Assembly

For More Information

Enter your email to receive product updates about LP FlameBlock Fire-Rated OSB Sheathing.