First you need to find what the building is classified as? Is it a multi-family
dwelling or a one or two family dwelling? Once the classification is determined
then you need to see if the fire separation between the dwelling units met the
requirements of the IBC. In the area where we practice the 2006 IBC is still in
effect and requires a two hour fire rated wall.
In IBC 2006 Edition, Chapter 7, Section 704, paragraph 704.11 "Parapets" Item
No. 5 states that "In Groups R-2 and R-3 where the entire building is provided
with a Class C roof covering, the exterior wall shall be permitted to terminate
at the underside of the roof sheathing or deck in Type III, IV and V
construction, provided:
5.1. The roof sheathing or deck is constructed of approved
noncombustible materials or of fire-retardant-treated wood for a distance
of 4 feet (1220 mm);"
Paragraph 705.6 "Vertical Continuity" Item no. 4 states: " In buildings of
Type III, IV and V construction, walls shall be permitted to terminate at the
underside of combustible roof sheathing or decks provided:
4.1. There are no openings in the roof within 4 feet (1220 mm) of
the fire wall,
4.2. The roof is covered with a minimum Class B roof covering, and
4.3. The roof sheathing or deck is constructed of
fire-retardant-treated wood for a distance of 4 feet (1220 mm) on both
sides of the wall or the roof is protected with 5/8 inch (15.9 mm) Type X
gypsum board directly beneath the underside of the roof sheathing or
deck, supported by a minimum of 2-inch (51 mm) nominal ledgers attached to
the sides of the roof framing members for a minimum distance of 4 feet (1220
mm) on both sides of the fire wall."
The 2009 IBC has similar wording but in a different section of Chapter 7
because of renumbering.
Regards
Jim Davidson
Davidson Associates
Fire Protection * Medical Gas * Code Consulting
302-994-9500 Fax:302-234-1781
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Dewayne Martinez
Sent: Friday, December 16, 2011 8:31 AM
To: SprinklerFORUM
Subject: IBC - building separations
Where is the spot in the IBC that defines what rating a wall must be to
divide a larger building into two smaller, separate ones?
I remember talk about row housing in San Francisco where one large
building was subdivided into separate townhomes by use of firewalls.
Thanks,
Dewayne Martinez
Design Build Fire Protection
-------------- next part --------------
An HTML attachment was scrubbed...
URL:
<http://fireball.firesprinkler.org/mailman/private/sprinklerforum/attachments/20111216/9efeba2c/attachment.html>
_______________________________________________
Sprinklerforum mailing list
[email protected]
http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum
_______________________________________________
Sprinklerforum mailing list
[email protected]
http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum
