A raft column footing, also known as a mat foundation, is a continuous slab that supports multiple columns, spreading the loads over a large area. It's used when soil bearing capacity is low, and individual footings would be too close, making a combined foundation impractical. The entire structure acts like a "raft" floating on the soil, uniformly distributing the loads across the entire building footprint. This helps in reducing differential settlements in buildings with numerous columns or irregular configurations. By encompassing all the columns in a single, cohesive slab, raft column footing provides an efficient solution for challenging soil conditions.
Raft Building Foundations are constructed with typical slab depths between 4”-12” (10-30 cm). Column widths are commonly 8”-12” (20-30 cm) with column spacings from 9’10”-24’6” (3-7.5 m).
A raft column footing, also known as a mat foundation, is a continuous slab that supports multiple columns, spreading the loads over a large area. It's used when soil bearing capacity is low, and individual footings would be too close, making a combined foundation impractical. The entire structure acts like a "raft" floating on the soil, uniformly distributing the loads across the entire building footprint. This helps in reducing differential settlements in buildings with numerous columns or irregular configurations. By encompassing all the columns in a single, cohesive slab, raft column footing provides an efficient solution for challenging soil conditions.
Raft Building Foundations are constructed with typical slab depths between 4”-12” (10-30 cm). Column widths are commonly 8”-12” (20-30 cm) with column spacings from 9’10”-24’6” (3-7.5 m).
