[Matt Kocian]

With considerations on the design profile and depth of aggregate, BioBarrier is a solution for this application. It is used as a root (vertical), pipe wrapping (surround), and weed barrier (horizontal) by stopping root intrusion by inhibiting cell division at the root tip or seed in the application types.  Although it does utilize an above average 4oz geotextile (2-3 oz is your typical landscape cloth), it is more than just a weed cloth and performs very differently than typical landscape fabric because of its design incorporating both physical and chemical barriers.  With reference to your concerns about treflan’s (trifluralin) persistence, it is a non-systemic, non-mobile, non-persistent chemical with the lowest possible EPA toxicity rating of a registered chemical.  We chose this specifically for these attributes to mitigate risks while eliminating the need for unwanted surface applications that result in a variety of issues (untrained applicators, overapplication, surface runoff, improper chemical use, etc.).  Treflan degrades rapidly after release (typically about 2-4 months when this close to surface), which is the reason for the injected nodule, slow-release design.  The chemical is released out of the HDPE nodules at a controlled rate over time to continually maintain a vapor barrier of treflan that stops the germination of seed or persistence of seed roots in the profile, not just at the fabric barrier.  A seed may start germination in the gravel, but as soon as the weed tries to expand its root system, it is stunted by the inability of cell division to continue.  Because it is not absorbed by the plant, it does not affect adjacent ‘wanted’ vegetation.  You are using BioBarrier creatively to orchestrate where you want growth to happen.  The previous posts bring up valid issues, but they are addressed with proper profile design.   An old, but informative video provides a good overview at:  http://vimeo.com/11174004 or search for BioBarrier video on google.  BioBarrier has over 35 years of successful documented applications, and the product warranty provides telling evidence of its long-term performance.  If you would like assistance in designing the gravel walk, my contact details are on http://www.biobarrier.com.

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