msteger Posted July 2, 2008 Report Share Posted July 2, 2008 I can't seem to recall what the minimum spacing allowed for roof sheathing to a chimney/metal vent. Today, I saw plywood directly up against a wood burning fireplace's chimney and called it out as a potential pyrolysis and fire hazard, but can't recall the exactly minimum requirement. Is it 2" min spacing b/w chimney and framing or plywood? Believe it or not, the seller also had plywood nailed up against the chimney in the garage as well. Thanks in advance. Quote Link to comment Share on other sites More sharing options...
Bain Posted July 2, 2008 Report Share Posted July 2, 2008 The manufacturer's stickers usually mandate a minimum of 2" clearance from combustibles. I always take a photo of the sticker to show my customer. Quote Link to comment Share on other sites More sharing options...
msteger Posted July 3, 2008 Author Report Share Posted July 3, 2008 What sticker are you talking about? Can't say I've every seen a sticker on a chimney. Quote Link to comment Share on other sites More sharing options...
Bain Posted July 3, 2008 Report Share Posted July 3, 2008 This guy. Image Insert: 588.55 KB Image Insert: 611.8 KB Quote Link to comment Share on other sites More sharing options...
msteger Posted July 8, 2008 Author Report Share Posted July 8, 2008 Thanks. I don't recall seeing stickers on metal vents very often. The 2" spacing only pertains to B (double walled metal) vent, correct? The single walled stuff needs to have more clearance like 6~ 8" if I recall. Quote Link to comment Share on other sites More sharing options...
StevenT Posted July 9, 2008 Report Share Posted July 9, 2008 I also believe that the "chaseway" should be fireproofed between floors. Quote Link to comment Share on other sites More sharing options...
randynavarro Posted July 9, 2008 Report Share Posted July 9, 2008 Urrgg. Big photos. Quote Link to comment Share on other sites More sharing options...
Bain Posted July 9, 2008 Report Share Posted July 9, 2008 Sorry RE the photo size. I was in a wicked hurry. Quote Link to comment Share on other sites More sharing options...
hausdok Posted July 9, 2008 Report Share Posted July 9, 2008 Hi John, Just resize them on your own computer then go back to your post, click the "edit" icon, delete the old photos, upload the resized ones, and then click "submit changes." ONE TEAM - ONE FIGHT!!! Mike Quote Link to comment Share on other sites More sharing options...
msteger Posted August 21, 2008 Author Report Share Posted August 21, 2008 The 2" spacing is required for B vents (double walled) and masonry chimneys. Quote Link to comment Share on other sites More sharing options...
Neal Lewis Posted August 21, 2008 Report Share Posted August 21, 2008 Matthew, a B vent for gas fired equipment requires one inch of clearance. Single wall is six inches for gas and 9-18 inches of clearance for oil fired equipment, depending. Quote Link to comment Share on other sites More sharing options...
msteger Posted August 23, 2008 Author Report Share Posted August 23, 2008 Thanks. Found the info in Code Check Complete (pp. 138 and 167). Quote Link to comment Share on other sites More sharing options...
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