Refer to Oaks Tech Note L3 - Inspection, Maintenance and Repair of Permeable Pavements – for comprehensive PICP maintenance details. This is a brief summary of selected information.
ROUTINE MAINTENANCE AND INSPECTIONS PICP Maintenance prolongs the performance of the system and prevents problems from developing. Inspections ensure compliance with applicable regulations. This chart outlines recommended PICP routine maintenance and inspections.
Display clearly visible signage identifying the surface as a permeable pavement Vacuum sweep surface debris Check depth of joint material Check outlets are clear of debris Verify surface infiltration rate Conduct environmental compliance testing as required by the owner / regulatory agency
Improve visibility or replace as required
Twice annually Replenish material when >13mm from surface
Ongoing Annually As specified
Vacuum sweep the PICP surface using a regenerative air sweeper or similar device with a slight vacuum capable of lifting sediment. Do not use a conventional street sweeper, which can remove jointing material and spread additional smaller sediment over the surface. ASTM C1781 – Standard Test Method for Surface Infiltration Rate of Permeable Unit Pavement Systems is an easily reproducible and low-cost method of monitoring the performance of PICP. All you need is a 12” diametre plastic or metal ring, plumber’s putty, a 20L pail and a stop watch. Test areas that most frequently encounter sediment or debris.
Remedial maintenance involves rectifying a performance problem or safety concern that needs to be corrected.
REMEDIAL MAINTENANCE Repair ruts and deformations
FREQUENCY Ruts > 13mm from grade Paver > 6mm above or below grade
Reset shifted pavers Re-stripping of lines Replace broken pavers Power vacuum surface and replenish jointing material Clean out underdrains and inlet/outlet devices
As required As required Infiltration < 250mm/hr or surface ponding observed As required
When power vacuuming the surface of the pavers, use a vacuum truck (like an Elgin Whirlwind or equivalent).
There is an ongoing study through the University of Toronto and NSERC that is investigating maintenance best management practices for PICP. New and innovative maintenance equipment, like the Typhoon PICP Joint Cleaning system are being introduced and evaluated. Contact Oaks for updates and information on the test results. Please note: you do not have to vacuum the entire pavement surface unless needed; focus cleaning on specific areas prone to clogging. Joint material will also be removed, so be prepared to replace it immediately after the area is cleaned.
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