Revised 2021
Note: This guide specification for U.S. applications describes construction of permeable interlocking concrete pavers on a permeable, open-graded crushed stone bedding layer (typically ASTM No. 8 stone). This 2 in. (50 mm) layer is placed over an open-graded base (typically No. 57 stone, 4 in. or 100 mm thick) and a subbase (typically No. 2 stone or similar sized material such as No. 3 or 4 stone). The pavers and bedding layer are placed over an open-graded crushed stone base with exfiltration to the soil subgrade. In low infiltration soils or installations with impermeable liners, some or all drainage is directed to an outlet via perforated underdrains in the subbase. While this guide specification does not cover excavation, liners and underdrains, notes are provided on these aspects.
Edit this specification term as necessary to identify the design professional in the General Conditions of the Contract. The text must be edited by a qualified, licensed design professional to suit specific project requirements. CMHA makes no representations or warranties of any kind, expressed or implied, and disclaims any liability for damages resulting in the use of this guide construction specification.
Note: This guide specification for Canadian applications describes construction of permeable interlocking concrete pavers on a permeable, open-graded crushed stone bedding layer (typically ASTM No. 8 stone). This 50 mm layer is placed over an opengraded base (typically No. 57 stone, 100 mm thick) and a subbase (typically No. 2 stone or similar sized material such as No. 3 or 4 stone). The pavers and bedding layer are placed over an open-graded crushed stone base with exfiltration to the soil subgrade. In low infiltration soils or installations with impermeable liners, some or all drainage is directed to an outlet via perforated underdrains in the subbase. While this guide specification does not cover excavation, liners and underdrains, notes are provided on these aspects.
Edit this specification term as necessary to identify the design professional in the General Conditions of the Contract. The text must be edited by a qualified, licensed design professional to suit specific project requirements. CMHA makes no representations or warranties of any kind, expressed or implied, and disclaims any liability for damages resulting in the use of this guide construction specification.