In older commercial masonry buildings, the steel angle above the windows and doors that supports the weight of the masonry above, may rust and swell. This process, known as rust jacking, exerts extreme expansive force both upwards and downwards creating structural cracks and heaving in adjoining masonry.
If not serviced, the deteriorating lintel will no longer function to support the brick or stone above and will compromise the structural integrity of the wall.
An experienced commercial contractor like PMR is required for this potentially hazardous job since bracing and shoring may be required to prevent catastrophic failure. Consideration must be given to replacing with the correct load bearing size galvanized steel lintels, flashings, end dams and weeps.