You can't make the concrete slab to big but it can be to small and that can be a big failure if it allows the chimney to sag. When you lay the chimney blocks the usual process is to lay 3 blocks and then put in a flue liner and lay some more blocks and then another liner. Note it is ok to put some mortar cement between the liners it is wrong to fill the space between the liner and the blocks. That space is to created a separate , sealed space that acts like a thermos bottle and it keeps heat in and the flue liner warm to provide a draft. This also helps prevent creosote from building up and plugging the chimney. The filling of this space is one of the mistakes amateur masons make. When your chimney reaches the desired height the flue liner should be a few inches higher that the concrete blocks and at this point a cap is put around the top of the concrete blocks and sealed against the flue to form an air tight top.
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Today's Featured Article - The Day Mom Drove the 8N - by Brian Browning. My Dad was wanting to put in a garden but couldn't operate the 8N and handle the old horse drawn plow he had found and rigged up to use with the tractor. Well, he decided to go get Mom out of the house and have her drive the tractor while he walked behind the plow. You got to understand that while my Mom is a hard worker who will always help whenever she can... she had never operated farm machinery before that day. Dad got her out there, explained how the clutch was the same as in our o
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