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Depending on the local conditions, there may be a water proofing issue. Cementitious products (concrete and cement mortar) shrink due to the hydration process of cement. So your mortar joint will become slightly contracted. Clay bricks expand when they are moist and contract when they dry out. So the wider the joints are, the more the differential between ...


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hmm chimney repair is expensive and 8 inch brick are not really hard to find. Visual aesthetic is a important factor for masonry and restoration, and proper brick bond is important in load distribution and tensil strength and ultimately waterproofing.. so 3/8 inch is the standard brick joint for all those reasons.



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