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LP Weather Logic

Defend against fire and flame spread

FlameBlock

Features and Benefits

Resisting Flame Spread

ICC-approved applications for fire-rated sheathing that combines flame-spread and burn-through resistance to meet fire codes.

Do More with Less

A building solution that provides strength, savings and easy installation – at an affordable price.

Exceed Expectations

Combined flame-spread and burn-through resistance bolster a home’s fire resistance capabilities, improving the homeowner’s peace of mind.

Design Freedom

Structural design values are not limited, providing more flexibility in designing wall openings, frames and bracing.

FlameBlock board

Product Specifications

  • OSB panels are available in 4 foot nominal widths and 8, 9, or 10 foot lengths
  • Available performance categories: 7/16?, 15/32?, and 19/32?
  • Available on APA Exposure 1 rated OSB

LP® FlameBlock® Product Overview

Learn more about the benefits of LP FlameBlock Fire-Rated OSB Sheathing – code compliance, strength, savings and design flexibility.

LP® FlameBlock® Burn Event

See how LP FlameBlock sheathing performs in a controlled product demonstration compared to untreated OSB.

How It’s Made

To create a standard OSB panel, LP’s innovative manufacturing process combines wood strands oriented in cross-directional layers with waxes and resins. Then, to create LP® FlameBlock® panels, LP’s proprietary non-combustible, fiberglass-reinforced Pyrotite® treatment is added, which combines flame-spread and burn-through resistance. This creates a product that not only resists fire damage but meets code, provides design flexibility, and also offers the strength and structural integrity of traditional OSB panels.
Infographic of FlameBlock board

Fire Resistive Technology

Go to work with a building solution that meets building code requirements for fire-resistent construction while increasing structural ratings. LP® FlameBlock® is an ICC-approved component of 1- and 2-hour fire-rated wall assemblies and roof deck applications. It combines flame-spread and burn-through resistance to give your customers peace of mind.

Working Better Together

Architect's Corner

We’re here to help you build your vision that stands the test of time.

Product Catalog

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LP FlameBlock Warranty

Ratings & Reviews

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