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.
Code compliant stamps must contain this information.
Exterior fire retardants may also be used in interior applications.
The stamp has a lot of information as well.
Cdx 5 ply interior fire rated fir pressure treated plywood 97874 the home depot.
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.
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 marine grade plywood does not qualify even though it is saline treated as it will have a different ul number.
Exterior use products must have one additional element referencing the specific standard for fire retardant lumber and plywood exposed to weather.
Fire retardant plywood on its own does not have an hourly resistance rating.
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.
When i can t see it i have no choice but to note it on the report.
We often get requests for plywood which is both fire retardant treated as well as being treated with regular pressure.