re: conventional vs post tension slabs?

Conventional steel is reinforcing from Day One, a PT slab has no active reinforcement until the stressing is done, normally after a week or so.

Comparing a PT and conventional slab both done half-assed, the conventional wins every time. If there is any problem with any part of the PT slab, the entire slab is compromised and no engineer would stand behind it or authorize a repair. This is not necessarily true with conventional reinforced slabs. They can be patched or cut and repaired. This is very difficult to do on a PT. house slab.

Risk:Reward? Conventional is easily worth a premium of 5-10%.