Jason:
Check with the manufacturer for amount of fibers to use to depend on your client’s desired results and budget.
You may not want to recommend substitution of fibers for steel reinforcement. It does not give you a slab of similar quality at all.
Another question may be the material selected for fibers. There are metallic fibers to evaluate in addition to fiberglass, nylon, or others.
Keys for slab design include:
Sub grade preparation and compaction
Reinforcement at center of slab
Crack control joints at close spacing (15’ o/c both ways is what I like to use)
Curing
Respectfully,
Bob Freeman, AIA, EIT
Integrated Design Services, Inc.
(949) 387-8500