It's a multi-family (4unit) building that the owner is trying to make into 2-2 unit townhomes where they could omit sprinklers. This particular AHJ only recognizes NFPA 13 and with all the cathedral ceilings and pitched roofs the owner does not want all the drains for the trapped attic pipe or the cost of a dry system. We do complexes with this owner all over the area so we are just trying to help him out of a jamb. If the AHJ will not budge the owner is probably going to build the attic and roof with fire retardant treated wood and the sprinklers will be omitted from the attic.
-----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Jim Davidson Sent: Friday, December 16, 2011 11:01 AM To: [email protected] Subject: RE: IBC - building separations 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 _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum
