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Will Mortar Stick To Old Mortar? [Solved]

Applying fresh mortar on top of old mortar that is loose or falling out will do little or no good; enough of the old mortar must be removed to make room for a layer of new mortar that is at least half an inch thick, and even then it is important to make sure that what is left of the old mortar is still solid and 3 Aug 1986

Replicating Old Mortar | This Old House

Mason Mark McCullough visits a South Carolina cement plant to see how a sample of

Is Your Mortar weak And Crumbling?

Is Your

Thinset on Concrete

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