3/4" Ply food firestop on top plate question

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12-30-03, 12:03 PM

Byron

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3/4" Ply food firestop on top plate question

Reference Cabo 602.7 is all i have.

The hand drawing the lady gave me at the permit office looks like this is a piece of plywood that goes from the exterior wall (basement foundation walls) across any space and over the top plate of the wall i'm building as a firestop.

Is that the right assumption here?
Can anyone point me in the right direction?

if so, what a PITA

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12-31-03, 03:23 PM

Jack the Contractor

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Fire stops go the depth of your wall studs. From the outside wall inward to the face of the stud. For instance 2x4 studs will have a 3 1/2" firewall, and 2x6 stud wall will have a 5 1/2" fire wall. I may be wrong, but I don't think plywood is allowed. At least I have never seen it allowed. It is usually a 2x? piece, nailed between the studs. Good Luck

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01-01-04, 07:33 AM

Byron

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I'll have to call around and see if anyone knows. It says "Plywood firestop" and then referenes that CABO code.. searching around on google to see if i can find a match for better reference.

Thanks!

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01-01-04, 11:41 AM

Jack the Contractor

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Your local code may very well allow you to use plywood for a fire stop. If so, it still goes in the same way. Where do you live ?

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01-01-04, 02:05 PM

Doug Aleshire

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Byron,

Take a look at this,

http://www.bdacorp.com/howto.htm

http://www.ci.mission-viejo.ca.us/de...oodframing.pdf

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01-01-04, 05:48 PM

Byron

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I live in lancaster PA.

From the drawing i have, it looks like they require a 3/4" firestop "cabo 602.7" from the foundation wall across the top plate of the stud wall. The picture shows this as being a wall that is 4" away from the foundation wall.

I guess my misunderstanding was if the wall is butted up against the wall directly, i was curious as to what the point of firestop would be since its just another piece of wood above the top plate

. I only have to 20" walls that face soil, so those will be 4" away as per the drawings i have, but the rest are common walls with neighboors and hence very dry and i don't have anything requiring me to build away from the foundation wall..

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