Product Overview

LP® FlameBlock® Fire-Rated OSB Sheathing offers impressive structural strength and burn-through fire resistance. Created by applying a patented, non-combustible Pyrotite® coating over LP® OSB, LP FlameBlock Sheathing is an ICC certified PS2-rated structural sheathing with a Class A Flame Spread Rating. It provides extended burn-through resistance, delivering a 20-minute thermal barrier.

  • Structural fire-rated sheathing
  • Patented Pyrotite® coating over LP OSB
  • ICC Certified (ESR-1365) per AC-264
  • Class A Flame Spread Rating
  • Variety of PS2 rated thickness categories and lengths,
    including Struc-1
  • Faster, more cost-effective compliance with fire codes,
    even in seismic zones
  • Durable, easy to handle on the job site
  • 20-Year Transferable Limited Warranty

Ideal For a Variety of Applications, Including:

  • BXUV-U349 exterior load-bearing wall for Type III construction
  • BXUV-U350 2-hour party wall
  • LPB-WA-60-01 1-hour exterior load-bearing wall assembly
  • Roof deck applications for firewall continuity
  • BXUV-W408 2-hour rated exterior wall near property line for Type III construction