We have finished our vent and are about to attach the flue. I have read that you should only use a small amount of morter to attach it. How much is sufficent? Just a small smear of morter up the side of the flue and down on the firebrick it's resting on an inch or two up? Also we are planning on making a brick chimney around the flue. I saw there should be a gap between the brick and the flue. How big a gap? Is there any reason we shouldn't use regular brick for the chimney? I've attached photos. Any help would be appriciated. Thanks
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