What should be the thickness of loose mortar removed during a re-pointing joint?

When re-pointing masonry joints, it's essential to remove loose mortar to a suitable depth to ensure proper adhesion of the new mortar and to maintain the structural integrity of the wall. The correct thickness for removing loose mortar during a re-pointing joint is typically around 1/4 inch. This depth allows for the existing mortar to be adequately prepared for new material, ensuring proper bonding and minimizing the risk of future deterioration.

Removing only a superficial layer may not provide enough space for the new mortar to anchor effectively, while removing too much could compromise the structural masonry. At 1/4 inch, the right balance is achieved, allowing for effective application of the new mortar without undermining the wall's strength. This practice aligns with established guidelines in masonry repointing to ensure optimal restoration and durability of the joint.