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All Categories > Expansion Joint / Specialty Roof Systems > Expansion Joint & Seismic Joint Systems > Johns Manville > Flex-I-Drain Roof Drain System  
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Flex-I-Drain Roof Drain System

Flex-I-Drain is a unique roof drain system, designed to connect to the building plumbing system with no hub onnectors. The flexible bellows allow differential movement up to 1" (2.54 cm) in any direction between the roof deck/roofing system and the plumbing.


Flex-I-Drain can be installed in any new or existing roofing system. Because of its unique flashing system, it is compatible with all roofing membrane systems and decks. Up to 31⁄2" (8.89 cm) of insulation can be placed under the drain.

Item #

Product Name


Unit Quantity

MVFLEX4.EA Flex-I-Drain 4" Roof Drain System Each Per Drain
MVFLEX6.EA Flex-I-Drain 6" Roof Drain System Each Per Drain


Johns Manville Flex-I-Drain Roof Drain System Data Sheet

Johns Manville MSDS