Water run off from EPDM roofs and our 100% silicone roofing is safe for watering crops. This is not true of PVC. PVC stands for polyvinyl chloride. There is a chlorine molecule in the chemical structure. Should the roof catch on fire, the fumes are highly toxic. EPDM is based on rubber, it is more natural and when decomposes, it does not add toxins to the soil. In our experience. PVC has caused allergic reactions during installation.
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