A very thimble question
So I built a basic chimney for a friend a couple of years ago and
every winter he cracks the thimble.
A chimney block and ceramic flue chimney. He runs Yodel’s biggest
woodstove off it.
Thermal shock was my guess.
Any ideas? this has happened every year for like five years.
Bump, ya troglodytes!
what kind of wood? Is he cleaning it?If thermal shock, I'm thinking a minor chimney fire.But more likely he is doing damage installing that only becomes apparent later under thermal streess
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He burns a pretty good wood. A mix of hardwoods, seasoned
well for the most part.
The chimney fire idea makes sense except it happened
the first winter he used it. Wouldn't seam like there would be
enough creosote by then.
He had a chimney sweep come that spring clean and inspect it too.
The installation damage is possible I suppose. We're on the fifth
thimble now, seams unlikely all of them would break. My theory is he comes home and starts the stove from bone cold,
and opens the ash door to "Boost" it. This being a rather large
stove is flares right up. Presto thermal shock on the cold thimble.
But many people do that without problems?
Is the pipe jammed in too tight and then the stove moving when he drops a big load in..? Possibly torqueing the thimble? Not enough motar around the thimble..?
Cast one out of wire reinforced refractory motar and a stove pipe for an inner form and a larger thimble for an outer form? Or sono-tube.
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The pipe could be to tight.
But again, we've gone through a bunch of them. You'd think
some of them would be looser. His floor is a bit springy, I'll go look at it.
Who you calling a troglodyte?
Very few of us subterranean dwellers here.PAHS works. Bury it.
Oh come now, there's a little troglodyte in us all.
You're probably right. Not many live it.
A BTer is coming Tues., bringing his skeptical GF, trying for a conversion. Are we supposed to act differently?
Hope Hanna heads elsewhere, it's wet out there.PAHS works. Bury it.