Post-tensioned concrete slabs are typically expected to crack less than other slabs because post-tensioning produces a compressive stress that must be exceeded before enough tensile stress develops to cause cracking. ... For a 100,000 ft2 post-tensioned slab, this would result in an estimated 900 lineal ft of cracks.

How long does post tension slab last?

Conventional concrete & rebar foundations last about 20-30 years before failure begins to occur. Post-tension slabs are lasting about 15-20 years and are failing at a much higher rate. Post-tension slabs are created with concrete trenches around the perimeter of the house where the external walls will be placed.

Is post tension slab safe?

The best foundation for bolting down a gun safe is a concrete slab. ... Post tension concrete slabs should not be used as a foundation for a gun safe. They have steel cables running through them. These cables are under thousands of pounds of pressure and are high-strength steel.