Tony Rigdon
  • Columbia, MO
  • United States
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Placement of 5/8" firewall, over or under foam board insulation?
16 Replies

I'm adding onto my personal residence and since the house is within five feet of the property line, I'm being required to install 5/8" drywall as a "firewall" on the exterior of my house over the…Continue

Started this discussion. Last reply by Hal Skinner Oct 2.

 

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Latest Activity

Hal Skinner replied to Tony Rigdon's discussion Placement of 5/8" firewall, over or under foam board insulation?
""There will be moisture buildup on the faces of the insulation board so it shouldn't be in contact with the drywall, I would seal the drywall before applying it to prevent it from soaking up moisture, "   Hi Tony,   After…"
Oct 2
Tony Rigdon replied to Tony Rigdon's discussion Placement of 5/8" firewall, over or under foam board insulation?
"They said one hour firewall yesterday, seemed to leave it up to me as to how to do it. They are basing this strictly on the closeness of the property line, neighbors actual house is still 25 feet away, so I might fight it based on that. My guess is…"
Sep 25
Tony Rigdon replied to Tony Rigdon's discussion Placement of 5/8" firewall, over or under foam board insulation?
"Wow, that sounds like a nightmare!!! You mentioning the roof has me worried now they are going to try and make me do something with my roof! I'm already planning on a metal roof, but can't imagine having to drywall my roof too… On…"
Sep 25
Eric Kjelshus replied to Tony Rigdon's discussion Placement of 5/8" firewall, over or under foam board insulation?
"Last job I did was 5 foot from each building one res one comm and the building inspector put a stop work work order with lack of sheet rock on both side of sides.  This is after stamped by city and others.  NOW after 15 or so meeting I…"
Sep 25
Tom Mallard replied to Tony Rigdon's discussion Placement of 5/8" firewall, over or under foam board insulation?
"There will be moisture buildup on the faces of the insulation board so it shouldn't be in contact with the drywall, I would seal the drywall before applying it to prevent it from soaking up moisture, then furr on top of the insulatioin to add…"
Sep 25
Robert Cameron replied to Tony Rigdon's discussion Placement of 5/8" firewall, over or under foam board insulation?
"Not uncommon for having to install a fire rated wall on outside when homes are close together.  Verify the hr. rating the town is asking for.  Your assuming its a one hr. rating? Or is that what they told you?  This would need to go…"
Sep 25
Tony Rigdon's discussion was featured

Placement of 5/8" firewall, over or under foam board insulation?

I'm adding onto my personal residence and since the house is within five feet of the property line, I'm being required to install 5/8" drywall as a "firewall" on the exterior of my house over the sheathing. I have also removed all the siding that was already present on the same side and am adding 1" of foam board for the additional R5 insulation value and air sealing. Now the big quandary for that side is, do I install the drywall directly against the sheathing, or install the foam board and…See More
Sep 24
Hal Skinner replied to Tony Rigdon's discussion Placement of 5/8" firewall, over or under foam board insulation?
"Yes, the concrete board is a Clsdd AQ Type 1 fire retardant with ZERO flame spread and ZERO smoke contributed.  That is the highest rating there is for flame spread fire retardancy. .I have never looked into it but, those concrete panels might…"
Sep 24
Tony Rigdon replied to Tony Rigdon's discussion Placement of 5/8" firewall, over or under foam board insulation?
"They haven't said anything about not using vinyl siding over the drywall, with my luck they'll wait until I've installed it! I think it is somewhere in the ICC Code, but not sure where… I've found a bunch of City…"
Sep 24
Hal Skinner replied to Tony Rigdon's discussion Placement of 5/8" firewall, over or under foam board insulation?
"I am curious now.  They require a penetration firewall in the wall system but do not require a Class A Type 1 fire retartdant material as the propriet\tary (outer) surface material?   No requirement for a Class A Type 1 on the…"
Sep 23
Hal Skinner replied to Tony Rigdon's discussion Placement of 5/8" firewall, over or under foam board insulation?
"WOW.  30 years working and m,eeting with every kind of contractor and never heard of this before.  Thats why I like this forum, even us ole farts can learn something new.   Just like the video we made with the fire department,, they…"
Sep 23
Tony Rigdon replied to Tony Rigdon's discussion Placement of 5/8" firewall, over or under foam board insulation?
"The building inspector when he inspected my footing told me about the drywall on the outside being required. Has to do with my getting a variance to build closer to the property line, I'm about three feet away. I"m guessing I could use…"
Sep 23
Tony Rigdon replied to Tony Rigdon's discussion Placement of 5/8" firewall, over or under foam board insulation?
"Bud, I'm in Columbia, MO so Zone 4 Mixed Humid. I had never heard about drywall on the outside either, until I had my footings inspected. I went through a battle to even start building as my existing house was within the side yard setback, so I…"
Sep 23
Sean Lintow Sr replied to Tony Rigdon's discussion Placement of 5/8" firewall, over or under foam board insulation?
"I am pretty sure he is talking about using commercial drywall designed for this type of purpose and with the rain screed detail that will help tremendously. I am also assuming he is probably in the Chicago area as that is a typical requirement here…"
Sep 23
Hal Skinner replied to Tony Rigdon's discussion Placement of 5/8" firewall, over or under foam board insulation?
"Found an article that might help  http://homerenovations.about.com/od/wallsandtrim/a/artgreenboard.htm   Never heard of using gypsum wallboard on the exterior of a building for fire purposes.  Who advised you to do that?  I would…"
Sep 22
Bud Poll replied to Tony Rigdon's discussion Placement of 5/8" firewall, over or under foam board insulation?
"Hi Tony, what/where is your climate?  Also, how is the rest of the wall constructed? Adding drywall of any thickness to the exterior side of a house, all-be-it under the actual siding, is a new one for me.  Out there the humidity and other…"
Sep 22

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Company
Chapman Heating and Air Conditioning
Professional Certification
BPI Building Analyst Professional
Professional Interests
Strawbale construction, Sustainable living, Computers
Website URL
http://www.chapmanhvac.com
Blog URL
http://www.triathleteguru.com
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At 2:25pm on May 6, 2014, Diane Chojnowski said…

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