Cellose As Fire Block For Exterior When Close To Neighbors? - General Discussion - Contractor Talk

Cellose As Fire Block For Exterior When Close To Neighbors?

 
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Old 12-05-2015, 06:28 AM   #1
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Cellose As Fire Block For Exterior When Close To Neighbors?


I'm remodeling a house that is less than five feet from the neighbors and need to have a fire block. I was going to put 5/8 inch drywall on the exterior underneath 1" foil faced foam, but I'm wondering if blown cellulose would meet the code. I have in the past had inspectors say I could use cellulose for a fireblock at the top penatrations (such as in a basement).
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Old 12-05-2015, 09:34 AM   #2
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Re: Cellose As Fire Block For Exterior When Close To Neighbors?


everywhere is different, when doing a project in town or in a high fire zone we have to install 5/8 ext. grade (brown paper) drywall on the outside walls, interior walls have to have type x 5/8

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Old 12-05-2015, 04:59 PM   #3
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Re: Cellose As Fire Block For Exterior When Close To Neighbors?


It's possible I'm just unaware of the code requirements with buildings that tight. But, gypsum board on an exterior seems like a problem waiting to happen. Is this fire block to protect the building from the neighbors "fire"? How about stucco on the exterior?
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Old 12-06-2015, 03:29 AM   #4
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Re: Cellose As Fire Block For Exterior When Close To Neighbors?


Well, from reading the first reply, I guess there is an exterior type drywall, I wasn't aware of this. I suppose I could put cement board up as well, maybe even 1/4", but I would have to check on that.

Yes, it is to protect us if the neighbors have a fire.
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Old 12-06-2015, 09:40 AM   #5
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Re: Cellose As Fire Block For Exterior When Close To Neighbors?


cement board like dura rock is not considered fire proof

another option is to use is densglass but that stuff blows hard

I think the mix up is you are allowed to use fiberglass insulation as fireblocking on interior walls, from floor to floor fire stops, instead of actually installing 2x blocking

just sheeted a building with 5/8 ext grade drywall for the same reason the op had, a building could be built next door five feet or less from this one, they come and inspect, does not have to be mudded or taped, used gold deck screws to attach, had to drywall the soffit also and the roll blocking between rafters
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Old 12-06-2015, 07:36 PM   #6
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Re: Cellose As Fire Block For Exterior When Close To Neighbors?


Also, use unvented soffit material on that side of the building.
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Old 12-07-2015, 05:55 AM   #7
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Re: Cellose As Fire Block For Exterior When Close To Neighbors?


I have a question on fire separation distance. Is the outside drywall required if less than 5' from the property line, or only if neighbors house is less than 5' from the property line? On one side the neighbor is less than 5' (our houses are only 3' apart, but only on one corner) On the other side of the house, we are within 5' of the property line, but the neighbors are more than 5' away. There is a 5' minimum setback on each side, but we are grandfathered in, the neighbors can never build within 5' of us because of the setback rule)

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