11/22/2017
Spread Footings (1)
• Most common type of foundation • Foundation consists of: ▫ Concrete slabs located under each structural column ▫ Continuous slab under load – bearing walls
Concrete Foundations
Shallow Foundations
Standard Footing
Spread Footings (2)
Spread Footing
•Sloped Column Footing •Simple Wall Footing •Simple Column Footing •Stepped Wall Footing •Stepped Column Footing
• Structural load is literally spread out over a broad area • Footing is wider than foundation wall • Each column and bearing wall has its own spread footing
Slab on Grade
Mat Slab
Monolithic
•Southern States (eg. Florida)
Standard Footings
Slab – On – Grade
• Most common type of foundation • Prevent frost heave • Element settling of structure • Ideal for: ▫ Gazebos ▫ Decks ▫ Porches
• Foundations poured as single structure with thick perimeter ▫ Perimeter bears load of exterior walls ▫ Perimeter acts as an integral footing • Slab rests on a bed of crushed gravel to improve drainage
3
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