BC Green Roof Victoria BC Consultants and plant plant growers
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Root barriers on Green Roofs protect the water proofing against penetration of plant roots.

You also have to think about root protection when considering a Green Roof.

As plant roots develop, they look for water. During a period where water is scarce, plant roots will travel to the last place water will be present on a roof, and that could be along seems and details within the roofing membrane. Some plants have invasive root systems that can penetrate a roofing membrane, resulting in roof leaks.

To protect the roofing membrane, we recommend installing a material with a high puncture resistance and avoid plants that develop a strong root system.

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There are also roofing membranes on the market that can function as both a roofing membrane and as a root barrier. EPDM and TPO roofing membranes have been used in the past as a single- ply waterproofing that are resistant to root penetration.

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