Why The Aggregate Spec Matters So Much

In a permeable pavement the joint is the drain. Every design assumption about infiltration rate depends on the aggregate holding an open structure under traffic. Angular fractured stone locks together and keeps its voids. Rounded stone rolls, packs and closes, and the system stops performing long before anybody notices water standing.

• High strength crushed and washed granite. Washed matters as much as crushed, because fines are what clog a joint.
• Meets ASTM #9 stone specs. The standard PICP joint aggregate gradation.
• 100 percent fractured surface. Every face angular, so it interlocks.
• Freeze and thaw resistant. It does not break down into fines over winters.
• Resists clogging and particle build up. In permeable pavement joints.

Where Perm Chips Is Used

• Permeable interlocking concrete pavement, PICP
• Standard and narrow permeable joints
• Commercial, municipal and residential permeable installations
• Anywhere an open graded joint aggregate is specified

Colors

• Saturn Tan. Warm light aggregate.
• Stormy Gray. Neutral grey granite.
• Eclipse Black. Dark contrast joint.

Perm Chips Specifications

Keeping The Chip In The Joint

Loose chip scatters and gets lost to traffic, wind and vacuum maintenance. SEK makes SB-1000 PermStik to stabilize it in place without sealing the joint closed, which is the pairing most commercial permeable jobs specify.