1. FOUNDATION
 Lowest division of a building
 “Substructure” ( partly or wholly below the surface
of the ground )
 Function is to support and anchor the
superstructure
 Should accommodate the form and layout of the
superstructure above and respond to the varying
conditions of the soil, rock and water below.
 Footing – extension of the lower part of the column
to distribute load
BASIC TYPES OF FOUNDATION
YOUNG, ADRIAN LAWRENCE D.
BUILDING TECHNOLOGY 1 – 7-00-8-00 AM

2. FOOTING
• Extended laterally to distribute their load over
an area of soil wide enough that the allowable
bearing capacity of the soil is not exceeded.
• Material used is concrete (reinforced or not),
which should not have a compressive strength
reading lower than 2500 psi.
BASIC TYPES OF FOUNDATION
YOUNG, ADRIAN LAWRENCE D.
BUILDING TECHNOLOGY 1 – 7-00-8-00 AM

3. FOOTING

4. TYPES OF FOOTING
• Strip footings – are the continuous spread
footings of foundation walls.
BASIC TYPES OF FOUNDATION
YOUNG, ADRIAN LAWRENCE D.
BUILDING TECHNOLOGY 1 – 7-00-8-00 AM

5. • Stepped footings – strip footings that change
the levels in stages to accommodate a sloping
grade and maintain the required depth in all
points around a building.
BASIC TYPES OF FOUNDATION
YOUNG, ADRIAN LAWRENCE D.
BUILDING TECHNOLOGY 1 – 7-00-8-00 AM

6. • Cantilever/strap
footings – consists
of a column footing
connected by a tie
beam to another
footing in order to
balance an
asymmetrically
imposed load. Strap beam
BASIC TYPES OF FOUNDATION
YOUNG, ADRIAN LAWRENCE D.
BUILDING TECHNOLOGY 1 – 7-00-8-00 AM

7. • Combined footings – reinforced concrete
footings for a perimeter foundation wall or
column extended to support an interior
column load.
BASIC TYPES OF FOUNDATION
YOUNG, ADRIAN LAWRENCE D.
BUILDING TECHNOLOGY 1 – 7-00-8-00 AM

8. • Mat/raft foundation – heavily reinforced
concrete slab that serves as a single
monolithic footing for a number of columns or
an entire building.
BASIC TYPES OF FOUNDATION
YOUNG, ADRIAN LAWRENCE D.
BUILDING TECHNOLOGY 1 – 7-00-8-00 AM

9. • Isolated footings – individual spread footings
supporting freestanding columns and piers.
BASIC TYPES OF FOUNDATION
YOUNG, ADRIAN LAWRENCE D.
BUILDING TECHNOLOGY 1 – 7-00-8-00 AM

10. • Continuous footings – reinforced concrete
footings extended to support a row of
columns.
BASIC TYPES OF FOUNDATION
YOUNG, ADRIAN LAWRENCE D.
BUILDING TECHNOLOGY 1 – 7-00-8-00 AM

11. Spread footing
 A concrete footing
extended laterally to
distribute the
foundation load over
a wide enough area
that the allowable
bearing capacity of
the supporting soil is
not exceeded.
BASIC TYPES OF FOUNDATION
YOUNG, ADRIAN LAWRENCE D.
BUILDING TECHNOLOGY 1 – 7-00-8-00 AM