In the event that there is subsidence in the foundation walls of a building, then a structural engineer must measure the absolute subsidence in the foundation walls. This is to determine whether or not to proceed with piling the foundations.
The following are important signs to determine if there is movement in foundation walls, but are not limited to:
1- Cracks in the foundation walls;
2- Shearing in brick facades ( Cracked houses );
3- Shearing and cracking in interior walls;
4- Inclination in floors, etc.
The structural engineer visits the building and performs a visual inspection and level survey of the foundation walls . If signs of movement and level survey readings indicate significant unevenness in the building's foundation walls, then the building will need to be stabilized with piles.
In general, buildings resting on clay are the most likely to have significant settlement in the foundation walls. The bearing capacity of clay is usually problematic. This weakness, in the bearing capacity, produces settlements and cracking in the foundation walls.
After the inspection visit, the Onesta Conseils engineer can:
1- Give your opinion on the spot regarding the subsidence of the foundations;
2- Write an inspection report concerning the condition of the foundation walls and assess the degree of subsidence observed on these walls;
Note: The foundation company that will carry out the stabilization work will also be responsible for drafting the plans, which will be done by its specialized engineer.
See: Cracked houses and the subsidy program, City of Laval
Subsidence of foundations
Typical plan for reinforcing foundations using piles.