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Can another size stone be used? |
| No. StormTech specifies 3/4"-2" washed, crushed, angular stone because it offers the best structural results. A sieve analysis should specify at least 80% is retained between 1 1/2" - 2". |
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Can I use rounded stone instead of angular? |
| No. Rounded stone does not offer the same friction angles as angular stone, therefore, it does not give the same structural characteristics. |
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Do the end caps and/or individual sections of chambers have to be screwed at overlaps? |
| No. The chambers overlap with corrugations that lock the sections together without the need for screws. |
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What is your warranty for the chambers? |
| StormTech, LLC offers a 1 year limited warranty on all of its chambers. A copy of the limited warranty may be obtained by contacting StormTech. The warranty applies only to chambers installed in strict accordance with StormTech's installation requirements and only when the conditions of the warranty have been met. StormTech will supply replacements for those chambers that StormTech determines are defective and covered by the limited warranty. |
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How do you determine the quantity of base stone? |
| The sub-grade bearing capacity and chamber cover height determine the required depth of crushed angular stone for the chambers’ foundation. The design engineer is solely responsible for assessing the bearing capacity of the sub-grade soil and applying StormTech’s minimum foundation requirements to the system plans. (Please see section 4.1, page 8 of the StormTech Design Manual) |
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Are the chambers used for Infiltration only? |
| No, only about 30% of all StormTech installations are retention, (Infiltration). A majority of StormTech installations are detention in which there is an outlet pipe to drain the system. |
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How do you use as a detention system? |
| You may design with a perforated underdrain, or another form of an outlet pipe. (See Section 7, page 13 of the StormTech Design Manual.) |
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How do you control sedimentation? |
| StormTech recommends using a treatment train approach as detailed in section 6 pg. 10-11 in the StormTech Design Manual. |
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What is the Isolator Row, and how do you get access for inspection? |
The Isolator Row is a row of StormTech chambers wrapped in filter fabric in which the first flush of the storm event is directed into that row. (Please see section 13.4 page 22 of the StormTech Design Manual)
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Why is injection molding better? |
| StormTech chambers are injection molded due to the capability of controlling wall thickness across the chamber. I.E. Injection molding allows precise control of the wall thickness of the chamber at critically structural areas. Further this allows an extremely high quality control and exacting standards for the chambers at our ISO 9001:2000 manufacturing facility. |
