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Flak Jacket® Fire Protection

Flak Jacket® Photo
TJI® joist, the number one brand in the industry, is available with a new fire-resistant solution called TJI® Joists with Flak Jacket® protection. Flak Jacket protection is a proprietary, patent-pending coating that enhances the fire resistance of TJI Joists and enables them to meet both single and multi-family fire protection code requirements. Flak Jacket protection helps solve the challenge of shifting code requirements while providing all the quality and cost-efficiency you expect of Trus Joist engineered lumber products.

Achieve a one-hour fire-rated assembly with just a single layer of gypsum and no expensive mineral wool. New TJI Joists with Flak Jacket® protection save you time, maximize labor, reduce costs and complexity, and enable faster, more efficient construction.

Like all TJI Joists, no special tools, training or handling are required; you can cut and drill the joists as usual and use standard hangers for quick and smooth installation. TJI Joists with Flak Jacket® protection deliver Weyerhaeuser quality and reliability backed by our service and support.

At a Glance – Flak Jacket® Benefits:

  • Ensure effective fire protection using existing designs and procedures
  • Faster, more efficient solution to achieve fire safety requirements
  • Easily drilled and cut for plumbing and ductwork
  • Customizable, predictable floor performance with TJ-Pro™ Rating
  • Includes the security of the TJI limited lifetime product warranty
  • Available in multiple series and depths
  • Simplify construction of multi-family structures

Flak Jacket® in Action

Product Literature

Design & Specification

Specifier’s Guide for TJI 110, 210, 230, 360, and 560 Joists
United States: TJ-4000 | W. Canada: TJ-4500

Fire-Rated Assemblies and Sprinkler Systems
N. America: 1500

Technical Resource Sheet

Sound Performance of Trus Joist TJI Joist Fire-Rated Floor Assemblies
N. America: TJ-4035

Installation Guides

Installation Guide for Floor and Roof Framing with TJI 110, 210, 230, 360 and 560 Joists
N. America: TJ-9001, Spanish: TJ-9001S

Product Overviews

Product Overview: TJI Joists with Flak Jacket® Protection
United States: TJ-4032 | Canada: TJ-4532

Floor Performance and TJ-Pro Ratings
N. America: SVC-4005

Flak Jacket® FAQ
N. America: FJ-FAQ


Trus Joist TJI Joist Warranty
N. America: TJ-1006, French: TJ-1006F

Trus Joist No Red Tag Guarantee
N. America: TJ-1013

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