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RE: Fire Rating

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UL, ICBO and other similar reports are based on actual test data. Any
deviation from the installation requirements, as stated in the report, would
need to have a justification from the authority who issued the report (in
this case UL). I suggest you contact them and see if they would bless the
proposal. Otherwise, I wouldn't make an arbitrary interpretation on this.

Ben Yousefi, SE
San Jose, CA

-----Original Message-----
From: Jim Kestner [mailto:jkestner(--nospam--at)somervilleinc.com]
Sent: Wednesday, November 27, 2002 11:38 AM
To: 'SEAINT'
Subject: Fire Rating


We would like to construct a concrete floor using  UL D920 with 4 1/2" min.
of normal weight concrete above an approved composite metal deck that has 2
hour fire rating with no fireproofing. If the floor is poured with 5" over
the deck, then where we have grout set tile (1 1/2" depression)  we would
have only 3 1/2" of concrete over the metal deck plus 1" of grout as a
setting bed for quarry tile. Would this meet the 2 hour fire rating? We
would not count the quarry tile as contributing to the fire rating.

Jim K.



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