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 - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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