Question: I am hoping you can advise me on a source for tremie concrete costs. I can't find anything on this topic in my usual cost data guides. Thank you for your time and consideration.

Answer: It's not surprising that you are finding that type of cost data hard to track down. Because the potential applications—and the tremies themselves—are so variable, the only way to get accurate cost data associated with tremie use is to look at your specific requirements.

A tremie is used to control the gravity delivery of concrete once it reaches the end of a chute, conveyor, or hose. For standard applications, where you're not placing concrete underwater, tremies range from relatively lightweight, flexible hose-like assemblies to heavy plastic that is stiffer but still flexible. Watertight tremies for placing concrete underwater also are available. These generally are lengths of steel or plastic pipe that can be joined to reach quite deep, depending on the project needs.

In both standard and underwater types, the weight of the fresh concrete sliding down through the tremie must somehow be supported. Manufacturers offer differing support systems, such as cables, as well as connection systems for attaching extensions as the tremie is lengthened and shortened throughout the project.

Contacting a tremie supplier would be one good way to get a cost estimate, but be prepared with some specific job requirements. Is it for an underwater application? What diameter will you require? What are your length requirements? What is your anticipated rate of placement? For a list of companies that offer tremie systems, click here, and type 'tremie' into product search.