Pervious Concrete - Asphalt Transition

In the NRMCA training for both stormwater designers and contractors, we teach the use of header curbs between the pervious concrete and adjacent asphalt to prevent water from migrating from under the pervious concrete to under the conventional pavement.  Such flows often cause subgrade failure under the plain pavement due to differential subgrade support as the area near the pervious concrete tends to be saturated while the soils farther away tend to be drier.  

Here are the slides from the contractor training class:

Comments

[Cal Jeske]

Good stuff Matt. This is something we at familiar with too. My experience in using this detail though is a bit different as to date the conventional concrete curbing has been used for product transitional aesthetic reasons only. To mitigate against sub-base and sub-grade water migration between pervious and non pervious areas we have had the greatest success with the use of a waterproof membrane. Curbing is often no deeper than 6". If it is the full depth of the full materials it quickly becomes a significant added cost and increase to schedule.