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J Barrier - Green Roof Drainage

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 Product Description


For Best Pricing Please Call: (800) 950-4972

Product Description:

J-Barrier is a solid sheet of 20 mil (0.51mm) 100% post-industrial polystyrene regrind. Each roll is 4' wide x 100' long (400 square-feet/roll). One of the primary objectives of a greenroof is to ensure the integrity of the waterproofing system and the supporting structure. A root barrier is a required component and is generally located within or at the membrane. Most membranes (i.e. hot applied rubberized asphalt, cold fluid applied, builtup bitumen, and modified bitumen) will require a root barrier to repel roots.



When used in conjunction with asphalt and bituminous waterproofing membranes and in assemblies with over 6” depth of growing medium, FM Global requires the use of a root barrier with a thickness of at least 0.03” (0.8mm). They require seams be lapped by 6” (150 mm), welded a minimum of 1.5” (38 mm), and tested. For projects not requiring FM Global Standards, seams can be overlapped and secured using J-Tape, a waterproofing tape.


Additional Information:




(800) 950-4972


Volume Discounts Available

on Orders Over $5,000

Contact us for volume pricing.


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