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Pier And Beam Versus Slab Foundations in the Dallas Area
Dallas has a rather unique mix of homes with slab (also called "slab on grade") and pier and beam foundations.  The majority of pier and beam foundations in the Dallas area can be found on older homes built up to the 50's and early 60's. 
Pier and beam foundations are still built today, but usually only by a few custom builders and contractors.  Most large production builders use only slab on grade, but most of them incorporate this with post-tension cables, which helps to increase strength and durability on Texas soil. 
The soil in the Dallas area tends to be very expansive because it contains a good deal of clay, which expands and contracts depending on the amount of moisture.  Hot, dry conditions in the summer can lead to foundation problems on both pier and beam and slab foundations, but are generally more common with slab.
Here are some advantages and disadvantages to both that may be worth considering.  Every house is built different, so these are not the only factors to consider.  As always, consult with a licensed structural engineer if you have specific questions about foundations.
 
PIER AND BEAM FOUNDATIONS
Advantages:
Allow for easy access to service or relocate plumbing, electrical and other mechanical ... more

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