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 - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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