dtontarski Posted March 13, 2013 Report Share Posted March 13, 2013 I'm looking for information on what would be a standard and approved method/material for fireblocking & draftstopping at the point the pipes for a high efficiency direct vent furnace enter the base of a wall chase on route to a through the roof install. Any information would be appreciated. This looks like it would be pain to install metal flashing around. Would ceramic wool be an option? Thanks! Click to Enlarge 41.21 KB Quote Link to comment Share on other sites More sharing options...
Jim Katen Posted March 13, 2013 Report Share Posted March 13, 2013 Around here, tightly packed fiberglass is considered acceptable. Quote Link to comment Share on other sites More sharing options...
Bill Kibbel Posted March 13, 2013 Report Share Posted March 13, 2013 I have a list of approved materials. Fireblocking: Fiberglass or mineral wool insulation 1/2" drywall 1/4" cement millboard 2x lumber 1x lumber, if 2 layers 3/4 plywood, OSB and particleboard. Draftstopping: 1/2" drywall 3/8" plywood or OSB Quote Link to comment Share on other sites More sharing options...
RickSab Posted March 15, 2013 Report Share Posted March 15, 2013 Wouldn't a fire rated expandable foam work. Great stuff and others make fire block spray. Quote Link to comment Share on other sites More sharing options...
Jim Katen Posted March 15, 2013 Report Share Posted March 15, 2013 Wouldn't a fire rated expandable foam work. Great stuff and others make fire block spray. Last time I looked at a can of that stuff, it specifically mentioned that it was intended to be used to fill small gaps, not large openings. Quote Link to comment Share on other sites More sharing options...
Mike Lamb Posted March 15, 2013 Report Share Posted March 15, 2013 Wouldn't a fire rated expandable foam work. Great stuff and others make fire block spray. Last time I looked at a can of that stuff, it specifically mentioned that it was intended to be used to fill small gaps, not large openings. I see the orange foam often and never thought about fill limitations so I did some Googling. From Dow on Great Stuff Fireblock: Fills, seals and insulates gaps up to 1/2 inch http://building.dow.com/na/en/products/ ... eblock.htm According to the ICC which looks like it lumped all Great Stuff products into one: A) Max. 1 5/16" wide, 3" thick max. B) max. 34 sq. in. per sq. ft. http://www.icc-es.org/reports/pdf_files ... R-1961.pdf Quote Link to comment Share on other sites More sharing options...
Jim Katen Posted March 16, 2013 Report Share Posted March 16, 2013 For single family homes, it's just not a big deal. Stuff the opening with whatever. But I wouldn't trust the orange foam on any critical application. If it's multifamily, where a fire could spread to several floors and across many units, I expect to see clean openings and fire caulk and some kind of intumescent seal at plastic penetrations. Quote Link to comment Share on other sites More sharing options...
Hearthman Posted March 16, 2013 Report Share Posted March 16, 2013 As long as it is not fire rated construction and that chase is less than 4 stories, you can use the list of materials in the IRC R302.11, or approved materials, which is essentially the list Bill provided. Now, let's say you want to use a material not on that list such as sheetmetal or foam. Go to your AHJ and get it approved. The main thing is, it must provide an effective fire barrier between separations. If you are not dealing with rated fire walls or shafts, then this std. applies. Quote Link to comment Share on other sites More sharing options...
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