WHAT IS THE BEST FOUNDATION?

	Any foundation is only as good as the soil it rests on.

We are often asked what kind of foundation is best.

From many years of experience, here are a few of our thoughts.

Full height basement:

Advantages: good access to mechanical and electrical systems, adequate space for appliances and equipment, extra storage space.

Disadvantages: vulnerable to water leakage, not well suited to some soil types, typically most expensive to build.

Crawl space (minimum eighteen inches deep):

Advantages: good to fair access to mechanical and electrical systems.

Disadvantages: vulnerable to water leakage, not well suited to some soil types, moderately expensive to build.

Slab-on-Grade:

Advantages: least expensive to build.

Disadvantages: no access to mechanical land electrical systems, more difficult to heat, less comfortable floor surface.

Cast in place concrete:

Advantages: most durable, most water tight, strongest.

Disadvantages: more expensive in some geographic areas.

Concrete masonry units (CMU or concrete block):

Advantages: less expensive in some geographic areas.

Disadvantages: less durable, less water tight, more vulnerable to movement.

Wood (PWF or Permanent Wood Foundation):

Advantages: less expensive in some geographical areas, can be built in any weather, more flexible for interior finishes, water tight if constructed properly.

Disadvantages: general acceptance is low, vulnerable to water leakage if not constructed properly, vulnerable to movement.

Soil conditions and budgets permitting, most experts agree that the best foundation is built of cast in place walls enclosing a crawl space or basement.

This provides access to the mechanical and electrical systems, good durability and optimum structural integrity. Of course, any foundation is only as good as the soil it rests on.

Properly designed footings, caissons, piles or other supports are always important. No home should be built without a thorough analysis of the underlying soils. From the expansive clays of the Southwest to the glacial clays of the Northeast, if improperly accommodated, any soil can cripple even the best foundation.

Criterium Engineers, Copyright © 1999

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