SB 77 Fire Retardent Treated Plywood

Question 1

It is used as

Answer 1

Roof Sheathing

Question 2

FRTP is generally used

Answer 2

Above party wall separations

Question 3

Some FRTP has been reported to be deteriorating to a point

Answer 3

Where the roof is unsafe to walk on. This is 1st detected by noting excessive waviness in roofs near party walls

Question 4

FRTP is said to become brittle to the extent that

Answer 4

One can put ones hand through it

Question 5

All members involved in roof ops are advised to

Answer 5

Survey the roof especially in the area of party walls for

1) excessive waviness near party walls
2) use a tool to test integrity of the roof
3) officers involved in roof ops are directed to closely supervise these ops

Question 6

If FRTP is observed at a construction or alteration site officers shall

Answer 6

Notify adjoining companies by phone followed up with a written memo and create a CIDS

Question 7

The problem with FRTP is

Answer 7

it has been treated with a chemical that is designed to decompose the plywood faster and render it less flammable when exposed to very high temperatures, such as those found in structural fires. However a significant amount of plywood has been treated with chemicals that initiates the decomposition at temperatures much lower than intended. The process is faster in the presence of heat and high humidity