Discussion
State whether the following is true or false.
Using the strongest available mortar is good practice in masonry repair.
Answer: B
Correct answer: False
A mortar stronger than the units it beds becomes the strong element, so movement is accommodated by cracking the stone or brick instead of the joint. Repointing should use a mortar weaker than the units and no stronger than the original, which is why lime mortars are specified for historic masonry rather than cement ones.
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