My picture will do a better job explaining then me. I'm hanging insulation 2 inch foam covered with drywall how close can I get to the wall thimble with the insulation and drywall? What about the cleanout which is a little bit below the thimble? The thimble is a single wall metal pipe that goes into a clay chimney. The stove hookups are not used but I would rather not make them unsafe. Thanks for the help.
Clearance to drywall from wall thimble
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Chinneysweep187
New Member
Masonry thimbles and single wall stainless pipe require 18" clearance. I would substitute for a durock concrete wall board or attach wire lathe to the wall parge a skim coat and apply lick and stick stone .
It does not need to look finished. If I put up the Durock ontop of the insulation can the 18 clearance be reduced? Or is it still bound to the 18 clearance no matter what I put on top of it.
Sounds like Im stuck having the insulation no closer then 18" all the way around.
Chinneysweep187
New Member
18" clearance meaning to anything combustible. Durock isn't combustible . If the insulation has a high heat rating which I wouldn't go less than 1000 degrees you can put it as close as you'd like
You may find this article helpful.
https://www.hearth.com/econtent/index.php/articles/passing_a_chimney
https://www.hearth.com/econtent/index.php/articles/passing_a_chimney
skinanbones
Feeling the Heat
As an inspector, if i know that you had 2" foam board with dry wall covering it. I would want to see something simular to the ICC insulated wall thimble in place, so that i know for sure the clearances are met. Here's a link to the product http://www.icc-rsf.com/main.php?t=chem_produits&i=46&d=&l=en
I think Im just going to have the foamboard stop 18 inches away and call it good. Having a section of basement wall 5 ft by 7ft uninsulated is not the end of the world. A portion of that wall on the otherside is crawlspace so its not even a full outside wall so its more like 5 ft x 3 ft uninsulated. If my plans changed in the future I can change it. Right now changing the thimble on an unused flu to accommodate insulation just seems silly.
Thanks for the info all!!
Thanks for the info all!!
Chinneysweep187
New Member
I wouldn't change the thimble it makes no sense in my opinion . Your thimble is in a cement wall clearances are fine . Like in the article begreen posted you can run cement board "durock" right up to the thimble
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