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Fire damper installation question

mtlogcabin

mtlogcabin

SAWHORSE
Joined
Oct 17, 2009
Messages
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Location
Big Sky Country
In wood stud construction,gypsum wallboard must cover

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all wood stud surfaces.

http://www.greenheck.com/media/pdf/manuals/826251CurtainDamperPacket_iom.pdf

This is in the greenheck installation manual (pg 7) and the drawing indicates the gypsum board wraps around the wood stud opening. This is new info for me and Greenheck tech could not tell me why it is in their instruction manual. The installation instructions meet the following codes/standards







National Fire Protection Association

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NFPA Standard 80, 90A, & 101

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IBC International Building CodeCSFM California State Fire Marshal

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Fire Damper Listing (#3225-0981:102)

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New York City (BSA/MEA listing #260-91-M)

This project has to meet IBC and 101 (health care) only so I hope it is a CSFM or NYC requirement since the framed openings are not large enough to accomodate 1/2 or gypsumboard all the way around the damper.
 
It may well be due to the CFSM or NYC, but since it's in the installation instructions, I don't think you have an option.

Let me know what you find out.
 
Depends on their tested assembly. It may have been tested with studs covered, thus the requirement.

If this is a blanket statement they're making reqarding all wood stud construction, then what about sill and top plates? :)
 
I found the same requirement for one-hour rated wall with wood studs in a 1994 SMACNA Fire, Smoke and Radiation Damper Installation Guide. Course under the IBC sprinklered building it is only a 1/2 hour required wall. Then again 721.6.3.3 seems to indicate a 2X member will provide a one-hour protection.

Has anybody been seeing the studs wrapped with gypsum board?

721.6.3.3 Fastener protection.

Where minimum 1-hour fire resistance is required, connectors and fasteners shall be protected from fire exposure by 11/2 inches (38 mm) of wood, or other approved covering or coating for a 1-hour rating.
 
I don't do a lot of (actually, any) wood construction, but every installation instruction I have ever seen calls for the wood framed opening to be protected by gypbd. If anything, I have used this to prove to an inspector that a wrapped opening is NOT required for metal studs, since it is only called for in wood construction.

You posted greenheck, here is Ruskin: http://www.ruskin.com/catalog/servefile.aspx?id=548 .Potterof: http://www.pottorff.com/cat/wood%20stud%20framing%20-%20drywall.pdf
 
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