REPAIR - Masonry's single greatest enemy is water intrusion. All exterior structures receive some form of depreciation during these Minnesota winters, especially structures above the roof. Freezing temps and icy snow not only can create major issues for your chimney, but can cause harm to interior components as well. Preventative maintenance and yearly inspections are crucial to the structural integrity of all your masonry structures. Cracked mortar joints, spalling (flaking, crumbling) brick, loose brick, are all signs of deterioration. A failed chimney crown and/or cap, can lead to a compromised chimney.