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FEMA 361 - debris impact on concrete over metal deck

FEMA 361 - debris impact on concrete over metal deck

FEMA 361 - debris impact on concrete over metal deck

(OP)
I'm looking for a little insight here since my searching is coming up empty.

Looking at FEMA P-361, 7.3.5 it says:

Quote:

"The TTU research also shows that a 4-inch-thick reinforced concrete roof provides sufficient protection from a 5-lb wood 2x4 missile impacting at 67 mph (the free-falling missile impact speed recommended in this document)."

If I consider a steel deck acting as the form with 4" of reinforced concrete over top, I have always been under the impression that this complies with the missile impact requirements. In fact, I consider this above the FEMA impact requirements since later in chapter 7 it is noted that concrete over a metal deck contained the spalling of the large concrete barrel (see page 7-29).

My question is, since most of the other FEMA assemblies are "pre-approved" for impact resistance, has there been any documented impact testing done of this type of roof system?

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