LP® FlameBlock™ passes California 12-7A-1 Burn Test

LP® FlameBlock™ Fire-Rated OSB has recently passed the California OSFM (Office of the State Fire Marshal) Chapter 122-7A-1 test: Fire Resistive Standard for Exterior Wall Siding and Sheathing.

FlameBlock™ -- manufactured by Barrier Technology Corporation for LP (Louisiana Pacific) Building Products, Nashville, TN passed a series of tests using FlameBlock™ as sheathing covered by LP® SmartSide® Lap and Panel Siding (Precision Series -- strand substrate) and using 1/2" cedar shingles. Builders can now use FlameBlock™ with these coverings -- as well as plain-bevel solid wood lap siding of various widths, including cedar and other species -- to address requirements of Chapter 7A of the California Building Code.

Click here to see a full copy of our test report.

Here is a picture of how this wall might be built using LP® SmartSide®.

FlameBlock has also been added to three newly-released 1 and 2 hour UL Wall Assemblies, as described in our ICC-ESR 1365 Report. Those wall assembly diagrams can be found here:

U348
U349
U350

Architects, engineers, builders, and code officials looking for more information on wall assemblies utilizing FlameBlock are encouraged to contact Barrier Technology or LP Building Products for further information.