SB7 Chap2 Gypsum Roof Decking

Question 1

Gypsum PLANK roof decking.
What are the dimensions and weight of gypsum planks normally?
Don’t confuse this with
gypsum CONCRETE roof decking
2.1.1

Answer 1

2 inches thick
2 feet wide
8 feet long
Are factory laminated of two gypsum panels each plank weighs approximately 135 pounds

Question 2

Gypsum CONCRETE roof decking.
Is usually how thick and weighs approximately?

2.2.1.

Answer 2

2 inch thick
17.5 pounds per square foot

Question 3

What is the main drawback for gypsum plank and concrete decking from a firefighter operational standpoint?
3.1.

Answer 3

Extremely vulnerable to moisture 

Question 4

Gypsum plank and concrete decking is extremely vulnerable to moisture ALONG with any supporting truss construction are conducive to an early collapse under Fire Operations. Members —— —— be committed to roof operations when this type of roof construction is found. 3.2.
It seems u need both plank and/or concrete decking with truss construction.

Answer 4

Shall not

Question 5

Gypsum plank and concrete decking.
Interior firefighting operation shall be conducted from areas of?
3.3.

Answer 5

Safety due to weight of such decking material.
Hose streams should be operating well in advance of members.

Question 6

Presence of gypsum roof deck will be indicated by a?
3.4

Answer 6

White powdery residue during saw operations.

Question 7

Gypsum roof decking once the observation of white pottery residue is witnessed members shall?
2 things.
3.4

Answer 7

Notification to the IC
Proceed to evacuate the roof