Basement lowering is a home renovation technique used to increase basement height and usable space. It involves excavating the existing basement floor to create a deeper foundation, allowing for additional headroom and improved functionality.
Basement Lowering Process Steps
Planning and Permits: Prior to basement lowering, a construction and building company develops plans and drawings for the project. Permits are required to authorize basement lowering.
Basement Demolition: The existing basement floor is demolished using jackhammers to prepare the space for excavation.
Excavation and Soil Removal: Excavation is carried out to lower the cellar floor to the desired depth. Soil and concrete removed during the excavation process are transported out of the basement through a window or opening and disposed of properly.
Installation of New Footings: New footings are installed beneath the existing foundation to support and stabilize it. These footings are strategically placed at different locations to ensure foundation structural integrity.
Inspection: A building inspector verifies that the work is carried out according to regulations and that the structure remains stable. The inspector checks materials installation and ensures compliance.
Drain Replacement and Waterproofing: Drainage systems and waterproofing measures are updated to accommodate the new floor level. This includes installing usable weeping tiles, sump pumps, and discharge systems to prevent water leakage.
Sewage Ejector Installation: If a basement bathroom is present or planned, a sewage ejector may be installed to facilitate proper waste disposal.
Gravel and Concrete Placement: A layer of gravel is added to the basement soil, providing a stable base for the new concrete floor. Concrete is then poured and leveled to create the new basement floor.
Final Clean-up: Once the basement lowering process is complete, the work areas are cleaned, tools and debris are removed, and the cellar and surrounding areas are left tidy and ready for use.