large stair step cracks in cinder block corner
Sounds like the vibration of removing the trees and/or stump grinding, may have caused the increased separation, which is probably indicative of a footing problem. Also, any changes in drainage may have caused settling.
If the separation isn't worsening, I would try tuck pointing the joints first, before rebuilding. When pointing (filling the cracks), the joints must be full and compact. Remove the old mortar, with hammer and chisel. Large voids may need to have some type of backer, to accomplish a compact joint. You should not be able to push the mortar through. Prior to pointing, the joints should be clean and dust free.
Last edited by jmagg; 08-08-2012 at 08:32 AM.