There can be several reasons why a homeowner might want to raise a house built on a slab foundation. Some common scenarios include property elevation requirements due to flood zones, foundation repairs or modifications, and adding an additional level to the structure.
Feasibility of Raising a House on a Slab Foundation:
While technically possible, raising a house built on a slab foundation is a complex and challenging task. It requires careful planning, expert knowledge, and professional expertise. Unlike houses on raised foundations, there is no existing space under the house to provide access for lifting. However, with the right methods and equipment, raising a slab foundation house can be achieved.
Methods for Raising a House on a Slab Foundation:
There are several methods that professionals employ to raise a house built on a slab foundation. These methods typically involve using hydraulic jacks or a pressurized lifting system. Here are some commonly used techniques:
1. Pier and Beam Addition:
One technique involves adding pier and beam supports by excavating around the perimeter of the house. Then, hydraulic jacks are used to lift the house incrementally, allowing new footings and beams to be installed. This method provides an opportunity to create new access space under the house while maintaining the slab foundation.
2. Slab Separation:
In this method, the slab foundation is separated from the house structure by cutting through the concrete. Hydraulic jacks are then used to lift the house, and the required adjustments or repairs can be made to the foundation. Once completed, the house is lowered back onto the slab, and the separation is sealed.
Considerations and Challenges:
Raising a house on a slab foundation presents various considerations and challenges that homeowners should be aware of:
1. Cost:
Raising a house on a slab foundation is a labor-intensive process that requires specialized equipment and skilled professionals. As such, it can be an expensive endeavor.
2. Structural Integrity:
Raising a house on a slab foundation puts stress on the structure. It is crucial to ensure that the existing foundation can withstand the lifting and subsequent lowering without compromising its structural integrity.
3. Planning and Permits:
The process of raising a house built on a slab foundation typically requires detailed planning and obtaining the necessary permits. Consulting with an architect, structural engineer, and local authorities is crucial to ensure compliance and a successful project outcome.
While raising a house built on a slab foundation is technically possible, it is a complex and challenging task that requires professional expertise. The methods employed to raise a house on a slab foundation involve careful planning, specialized equipment, and skilled professionals. Homeowners considering this undertaking should thoroughly assess the feasibility, cost, and potential structural implications before proceeding.