1 hour wood frame detail

[Francis Vineyard]

Need detail of protection between the ceiling/floor (open web joist) in a 2x4 wood framed 1 hour exterior wall. Is there a max. - min. air space between the gypsum and inside of the sheathing?

Thanks in advance

 

[Examiner]

You need to check with the open web joist manufacturer for any tested assemblies he has.

Here are some links that may be helpful

UL - http://database.ul.com/cgi-bin/XYV/template/LISEXT/1FRAME/showpage.html?&name=BXUV.GuideInfo&ccnshorttitle=Fire+Resistance+Ratings+-+ANSI/UL+263&objid=1074327030&cfgid=1073741824&version=versionless&parent_id=1073984818&sequence=1

and some sheet rock companies they have tested assemblies using various construction types.

http://www.cgcinc.com/home.asp?nav=0&mkt=30

http://www.usg.com/index.html

Hope this helps you find what you need.

 

[Examiner]

http://www.cgcinc.com/home.asp?nav=72&mkt=30&bc=5.72

The above would take you to a page where you select the title "Fire-Resistant Assemblies SA100" and click on the PDF icon. Scroll throught the PDF to the Floor/Ceilings to the Wood Framed Section and keep going untill you see the drawing of a assembly that is yours.

 

[Francis Vineyard]

http://www.cgcinc.com/home.asp?nav=72&mkt=30&bc=5.72 The above would take you to a page where you select the title "Fire-Resistant Assemblies SA100" and click on the PDF icon. Scroll throught the PDF to the Floor/Ceilings to the Wood Framed Section and keep going untill you see the drawing of a assembly that is yours.

Guess I'll have to take the time to read through them, could not find the detail. I once had this detail saved showing the gypsum between the non-rated ceiling and floor space on the interior side of an exterior wall <5 feet from the lot line for 5B construction. Of course the gypsum goes on before the I-joist but what about 2x's joist?

Where at the insulation phase for a 'Habitat for Humanity' 4 dwelling unit project and the 'volunteered' architect is not at all familiar fire rated construction.