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WET CAST VS DRY TAMP
WET CAST VS DRY TAMP
The two methods of producing genuine architectural precast products are wet cast and vibra dry tamp methods. Wet cast, commonly referred to as precast concrete, is a plastic or pour able concrete, the viscosity of which can be measured by a slump test. The finished of wet cast are virtually unlimited, and its products can sustain structural characteristics. Both conform to ASTM C1364 specifications.

Dry tamp, commonly referred to as cast stone, is, as the name implies, an extremely dry mix with no measurable slump that is placed in a form and compressed with pneumatic rammers. The finish of dry tamp is generally restricted to that of simulated limestone with limited structural properties. The pounds per square inch (PSI) of our precast is a minimum of 6,500 psi as indicated in our test reports.

Aside from the physical properties and forming techniques, curing is the main difference between wet and dry production, following pouring, wet cast usually sits indoors, overnight, in a climate-controlled environment and is stripped the next day. Test cylinders are made at the time of casting to ensure proper strength.

Dry tamp concrete is immediately removed from the forms and compaction and moved to a curing room, where humidity levels are kept at nearly 100 percent for 24 or more hours. The absence of this curing method accelerates the hydration of concrete, which severely compromises quality. You likely won't notice the poor quality until after it is in place for several months or after a few freeze-thaw cycles.

Preferred Precast, Inc. produces only precast concrete (wet pour) and is in strict conformance with ASTM C1364. 


BENEFITS OF USING PREFERRED PRECAST;
  • Has a HIGH 6800 PSI rating
  • Can Be Set Below Grade
  • Heavy Moisture...NO PROBLEMS!
  • Fast Delivery
  • No Up charges For Finished Ends
  • Virtually The Same Cost!!!
  • and much more

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