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6.0
Required Materials for Installation
6.1
Chamber Row Separation
The HS75 is designed to have a minimum of 6 inches of spacing between each chamber with the
footing of each chamber being parallel to the one next to it. The HS180 is designed to have a
minimum spacing of 8 inches between the chambers. (Figure 6) Wider spacing is acceptable and
will increase the storage with the additional stone voids as well as spreading the load on the native
subgrade material. A brick or other spacer is recommended to maintain the required spacing
between the chamber feet.
6.2
Stone Backfill
The acceptable stone materials for each of the backfill layers are shown in Table 6. The embedment
stone which is used under, in between, and above the chambers must be washed, clean, crushed,
and angular. The backfill placement and compaction recommendations are shown in Table 7.
Figure 7 depicts a typical installation cross section for the HS75 and HS180 chambers. Table 6 and
Figure 7 indicate the appropriate locations and types of backfill required for the installation of the
chamber system. The material above the clean, crushed, angular backfill used to envelope the
chambers (layer D) can be as specified by the engineer to provide adequate sub base for the
overlying structures. Minimum and maximum fill requirements are also shown in Figure 7. The
minimum cover for non-paved installations is 24" for HS75 chambers and 30" for HS180 chambers.
Page 15
Figure 6 - Minimum Chamber Row Spacing
©2015 Prinsco, Inc | 800.992.1725 |
www.prinsco.com
Design Guide
05/15
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