Countryboy39067 Posted May 7, 2010 Share Posted May 7, 2010 Hey guys. I'm to the point in building my shop that it's time to punch a hole in the metal roof and seal it around the forge chimney. The chimney pipe is 3/16th thick pipe that's 20 1/4 inches OD. I've been told that the best sealant for this is rain gutter caulk. Quote Link to comment Share on other sites More sharing options...
son_of_bluegrass Posted May 7, 2010 Share Posted May 7, 2010 If you don't know that it outside of the pipe will stay cool enough, you might want to consider a high-temp caulk. Of course for caulk, high-temp is somewhere around 600 F or so. ron Quote Link to comment Share on other sites More sharing options...
Glenn Posted May 7, 2010 Share Posted May 7, 2010 The chimney pipe is 3/16th thick pipe that's 20 1/4 inches OD. A chimney that size draws both ways. When not in use it will draw water out of a passing cloud, and in winter will launch most every BTU in the shop skyward. Quote Link to comment Share on other sites More sharing options...
Sam Thompson Posted May 7, 2010 Share Posted May 7, 2010 I'd have a walk round a few builders' merchants and ask them for advice. With a flue that size you need to put a cowl on the top. Quote Link to comment Share on other sites More sharing options...
Sweany Posted May 7, 2010 Share Posted May 7, 2010 Would it be possible to mount the chimney outside the building, and then connect to the forge through the wall? no leaks in roof, I think Uri posted a pic of a similar design. The chimney sounds to big to me too, unless you have a very big fire. Good tip here.http://www.anvilfire..._loss_stack.htm Quote Link to comment Share on other sites More sharing options...
Glenn Posted May 7, 2010 Share Posted May 7, 2010 The square tunnel is 13 inches x 13 inches with a 4 degrees down slope to prevent the rain water from flowing back into the fire. The tunnel is some 4 feet long, but it can be 1-2 feet more if needed without any problems. The tunnel is fabricated from 3/16 inch regular sheet metal (black), and painted twice with silver paint. After 15 years it is not rusted yet Hofi Quote Link to comment Share on other sites More sharing options...
Countryboy39067 Posted May 7, 2010 Author Share Posted May 7, 2010 A chimney that size draws both ways. When not in use it will draw water out of a passing cloud, and in winter will launch most every BTU in the shop skyward. Yeah Glenn I think it may do that, but that's what I had available with the junkyard budget I have to stick to. Quote Link to comment Share on other sites More sharing options...
Glenn Posted May 7, 2010 Share Posted May 7, 2010 What is the current length of your chimney pipe? What is the distance from the forge to the roof? Quote Link to comment Share on other sites More sharing options...
bruce wilcock Posted May 7, 2010 Share Posted May 7, 2010 tear some canvas or sack into strips ,mix some cement powder with water into a slurry soak the sack cloth in it and wrap it around the joint and smmoth it over, when its dry give it a coat of paint . Quote Link to comment Share on other sites More sharing options...
Countryboy39067 Posted May 7, 2010 Author Share Posted May 7, 2010 What is the current length of your chimney pipe? What is the distance from the forge to the roof? The pipe comes in 4ft sections and the roof is 62" from the forge table. I have 3 sections of pipe meaning the chimney would extend about 7ft about the roof. Quote Link to comment Share on other sites More sharing options...
Countryboy39067 Posted May 7, 2010 Author Share Posted May 7, 2010 Would it be possible to mount the chimney outside the building, and then connect to the forge through the wall? no leaks in roof, I think Uri posted a pic of a similar design. The chimney sounds to big to me too, unless you have a very big fire. Good tip here.http://www.anvilfire..._loss_stack.htm Thanks Sweany! That's the design I was going to use but I forgot where I saw it. Thanks again!!! Quote Link to comment Share on other sites More sharing options...
thecelticforge Posted May 7, 2010 Share Posted May 7, 2010 A chimney that size draws both ways. When not in use it will draw water out of a passing cloud, and in winter will launch most every BTU in the shop skyward. Too bad it is not practical to have a winter chimney and a summer one. Quote Link to comment Share on other sites More sharing options...
Frosty Posted May 8, 2010 Share Posted May 8, 2010 Too bad it is not practical to have a winter chimney and a summer one. You're so right! Doesn't it just DAMPER your enthusiasm? Oh wait, a damper would be just too darned easy and we ARE blacksmiths so forget that idea! Frosty the Lucky. Quote Link to comment Share on other sites More sharing options...
pkrankow Posted May 8, 2010 Share Posted May 8, 2010 Stove cement comes in caulk tubes, is easy to apply and is a treat for sealing up pesky joints in stovepipe. Phil Quote Link to comment Share on other sites More sharing options...
Countryboy39067 Posted June 13, 2010 Author Share Posted June 13, 2010 Stove cement comes in caulk tubes, is easy to apply and is a treat for sealing up pesky joints in stovepipe. Phil Stove caulking is ideal for inside use but won't last through one good rain if used outside. Quote Link to comment Share on other sites More sharing options...
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