What mortar is best for tuck pointing?

• A. Type S
• B. Type N
• C. Type O
• D. Portland Cement

Answer: (B)

When repointing, you want a mortar that can be worked into joints, cures at a compatible rate with the existing masonry, and provides durability without being overly rigid. A general-purpose mortar like Type N offers the right balance: it has enough strength to resist weather and minor loading while remaining workable and less brittle than higher-strength mixes. That makes it easier to tool to match the surrounding joints and reduces the risk of cracking bricks or causing spalling from differential movement.

Higher-strength mixes (Type S) are stiffer and can transfer more stress to the brick units, which isn’t ideal for tuckpointing where the goal is harmonious movement and long-term durability. A mortar that’s too weak (Type O) won’t hold up in exterior conditions and will deteriorate faster. Portland cement by itself isn’t a complete mortar mix for tuckpointing because it lacks the lime content that provides workability, bonding, and some flexibility. So, Type N is the best match for tuckpointing in most standard exterior situations.