To determine whether your walls need tuckpointing services, a simple test you can do is scratch a key along the mortar joints and see if any powdery material comes off. It is also wise to repair mortar joints as soon as possible before it becomes a serious issue.
The staff at Able Chimney Sweeps were very accommodating about scheduling service. Jerry and his team were outstanding, very courteous, and efficient. I highly recommend the company and its products and services!