Sonotube Pier and Beam System Diagram
Concrete Pier is Reinforced with #3 Rebar. Forming a Steel Cage.
Concrete Pad is Reinforced with #4 Rebar.  See diagram to the left of this picture.
Absolutely no water should be allowed to accumulate near a house, run toward the foundation,  or pass under the house.

With our clay soils, water causes the surface and sub-surface piers to heave and sink or drop with seasonal changes in moisture.  A damp, enclosed pier and beam foundation area may also lead to wood rot and encourage termite.  Assure that ventilation is adequate, and if not, add vents and fans.

More often than not, most of the damage to a pier and beam foundation will come from inadequate pier support as the wet clay turns to mud.
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Beam Rests
on the Concrete
Column
Sub-Floor Support by Floor Joists
10" Concrete 
Sonotube Formed 
Pier
Secured with Galvanized
Metal Strap
Concrete Pier is Reinforced with #3
Rebar, Forming a Steel Cage
Depth of Pier is 24" Below
Existing Grade

24"x24"x12"
Concrete Pad
Concrete Pad is Reinforced with # 4 Rebar
#3 Ties Used in Length of Concrete Pier Exceeds 24"
Beam Rests
on the Concrete
Column
10" Concrete 
Sonotube Formed 
Pier
 A Closer Look with Picture Added Below!
Secured with Galvanized
Metal Strap
Sub-Floor Support by Floor Joists
Concrete Pad is Reinforced with # 4 Rebar

24"x24"x12"
Concrete Pad
Depth of Pier is 24" 
Below
Existing Grade
Armadillo Foundation Repair