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Firewall Questions

 
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Old 12-09-2015, 09:04 PM   #1
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Firewall Questions


I'm building a house that is within a foot of the lot line. Therefore I have to put in a firewall. 5/8 exterior type x drywall on the exterior and 5/8 type x on the interior. Do I also need this on walls perpendicular to the wall that is so close to the property line (at least up to the 5' fire separation mark)?

What about windows? I'm imagining that I have to put 1 hour fire rated windows in the wall facing the property line, and in the front and back wall that is within 5' of the property line?

Thanks, this stuff isn't clear in all the manuals I have read, and in one it says something about it not being necessary in perpendicular walls, but it wasn't clear to me.

Thanks
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Old 12-09-2015, 09:22 PM   #2
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Re: Firewall Questions


You do need to return your protection on perpendicular side here. Opening's need some kind of shutter or protection beyond rating I believe. .would need to look into further.

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Old 12-09-2015, 11:31 PM   #3
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Re: Firewall Questions


Its been a while since I have done one of these. But I seem to remember doing 2 layers of drywall behind any partition/drop/bulkhead

Are you the builder or the framer? We have started to sheet the walls normally with osb/plywood then cover it with durrok. This way siders are happy and makes the walls stronger as a whole.


The windows I'm not 100% sure about I don't recall ever putting a window on walls that close to the property line. I'd call an engineer or inspector and see what exactly they are looking for.
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Old 12-10-2015, 12:29 AM   #4
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Re: Firewall Questions


You may find that you are only allowed to have a rated window up to 3' from property line and not as close as a foot.

Any closer than 3' and no penetrations allowed, rated or not.

Andy.
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Old 12-10-2015, 04:54 AM   #5
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Re: Firewall Questions


You could be right, but I'm thinking it is not really a penetration if it has a closed fixed 1 hour rated glass in it? I guess I'll find out.
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Old 12-10-2015, 08:40 PM   #6
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Re: Firewall Questions


Okay, the building inspector called me back and said I was allowed windows (of any kind, didn't need to be 1 hour rated) if more than 3' from the lot line. No windows or doors within 3' of the lot line.

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