A fire retardant treated backboard will be designated with a fire rated stamp branded or stamped along the edge or center of the plywood ul fr s plywood 1780 r 7003 i always look for the stamp.
Fire retardant fire rated plywood stamp.
Building codes require stamps on fire retardant treated wood products for both interior use and exterior use to have the same seven elements as listed above.
When i can t see it i have no choice but to note it on the report.
Product coloration is not a substitute for a building code approved third party inspection agency label.
The stamp has a lot of information as well.
Fire retardant plywood on its own does not have an hourly resistance rating.
We often get requests for plywood which is both fire retardant treated as well as being treated with regular pressure.
This fire retardant plywood is classified as a type a fire retardant product.
Exterior fire retardants may also be used in interior applications.
Code compliant stamps must contain this information.
The approved rated ulc or factory mutual assemblies which may contain fire retardant plywood as a component would have the hourly resistance rating.
The product is decay and termite resistant.
Exterior use products must have one additional element referencing the specific standard for fire retardant lumber and plywood exposed to weather.