Block chimney?

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Old 09-17-13, 01:55 PM
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Block chimney?

My friend wants to put a wood stove in his house,he asked me about putting up a block chimney,I DO MESS WITH MASONRY NOW AND THEN, but i told him I would help him as long as he had real mason there, if it was my house i would probably try it but i can't be responsible for his house. My question is does he have to build a block chimney,"is this a building code" we live in pa, or is it for looks, is there some type of pipe he can run instead. thanks
 
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Old 09-17-13, 02:28 PM
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Most places allow triple-wall metal piping to be used, with a wood-framed surround. But check with the local AHJ, as there may be certain restrictions in your area regarding the use of same. And the pipe itself is a bit pricey, too (goes for around $100 a foot here).
 
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Old 09-17-13, 03:21 PM
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wow!! pretty expensive, Might be cheaper to get a mason and put up the block, probably need 20 ft. or so assuming the pipe has to go above roof like the block would. thanks
 
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Old 09-17-13, 03:35 PM
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I am assuming that you mean concrete block. A chimney cannot be made of JUST concrete block but MUST have a liner. Most common chimney liner is terra cotta flue tile. The tile is laid up with the block at the same time.
 
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Old 09-18-13, 01:33 PM
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yes that is what I'm talking about the square blocks, 16x16x8 i think, with the liner inside, any idea what a aprox. 20-25 foot chimney would cost to build.
 
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Old 09-18-13, 01:43 PM
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I've built a few chimneys using the 16x16 chimney block - they do not come with a liner!! The liner is separate, approximately 7" square by 2' long. It shouldn't be too hard to price the materials by calling one or two stores that sell the block. You'd need some estimates to come up with a labor price.
 
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Old 09-18-13, 01:50 PM
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ok thanks, I never actually built a chimney, I have did some foundations,brick work,i by all means am no professional, that's why i told my buddy i would help but he would need more experience there so nothing goes wrong.
 
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Old 09-18-13, 02:22 PM
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Another thing - chimneys need a good foundation/footer. They have a lot more weight per sq inch than the foundation does so they need a better footer to support them. You've probably seen some old chimneys where the top is leaning away from the structure
 
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Old 09-19-13, 01:14 PM
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I already told him if he wants to save some money we could do the footer, told him we would dig down to 40 inches and put a 4 inch slab in, 24x24, does this sound right, we're in ne pa.
 
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Old 09-19-13, 02:09 PM
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A footing only 4" thick isn't much of a footing. You'll get better support for the chimney if you go at least 8" thick. Making it slightly larger in area would also help, lessening the likelihood of the thing settling unevenly (and the chimney leaning).
 
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Old 09-19-13, 02:13 PM
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ok thanks for the info very helpful, probably would of made mistake from the get go.
 
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