JOHNS MANVILLE
Roofing Systems Group
717 17th Street
Denver, CO 80202
Toll-Free: (800) 922-5922
Fax: (303) 978-2318
Web site: http://www.jm.com/roofing

Roof Drains and Vents

Flex-I-Drain® For Reroofing and New Construction

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

  • Made from tough, durable, high UV-resistant, high tensile strength modulus, high heat deflection temperature GE Noryl® resin. It meets UL94V-1 requirements. Standard color: Black. For installations requiring a white drain, a white Noryl strainer basket will be furnished.
  • Lower installation cost—one person installation (deck clamping ring installation requires only one person under the deck). Lightweight (6 lbs.)
  • Broad code approval/certification
BOCA 1993 National Plumbing Code

ICBO 1994 Uniform Building Code

SBCCI Std. Building and Plumbing Codes

1995 International Building Code
  • Compatible with all roofing membrane systems and decks.
  • Up to 3 1 /2" of insulation can be placed under the drain. Where thicker insulation is used, a sump can be fabricated to accommodate the 3 1 /2" restriction.
  • Short Flexible boot also available.
  • Deck flange shipped with removable fiber board plug to prevent entrance of construction debris and bitumen into the plumbing system during construction.
  • Included in all Johns Manville Roofing Systems Guarantees for total system responsibility.
*Noryl is a registered trademark of General Electric.

RetroDrain® For Reroofing

Johns Manville offers several RetroDrains specifically designed for use when reroofing an existing roof system with existing roof drains. RetroDrains are installed in the new system, with sleeves designed to tie into the existing drains, with patented mechanical compression seal to prevent backup.

PC/PET RetroDrain

PC/PET RetroDrain replacement roof drains are manufactured from engineered resin co-polymer. The PC/PET is tough. It is consistently resistant to temperature extremes. The strainer dome installs with a snap fit. The ribbed clamping ring, with raised connection bosses, positions perfectly every time, while forming a watertight seal to the roof membrane. The one-piece molding of the RetroDrain body is designed to sit flush on the existing roof drain, thereby eliminating the need to remove the old drain. The integral Johns Manville Seal ensures a watertight connection to the old drain pipe.

SuperDome® RetroDrain

SuperDome RetroDrain has the same PC/PET one piece molded RetroDrain body. However, it is furnished with a cast aluminum strainer dome with screw-down lid which secures the drainage system against vandals while permitting access to authorized personnel. The strainer dome with integral clamping ring is connected to the RetroDrain body. Included in all Johns Manville Roofing Systems Guarantees for total system responsibility.

*RetroDrain and SuperDome are registered trademarks of U-Flow Roof Drain Systems, Inc.

USII RetroDrain

The USII RetroDrain product line is manufactured from .064" (1.6 mm) spun 1100 aluminum alloy. Its one-piece construction drain body is designed for retrofit applications. The strainer domes securely fasten to the flange by means of a push-in fastener system. The model incorporates the technology of the Johns Manville Seal providing a mechanical watertight connection. The versatile USII RetroDrain easily fits into schedule 40 or 80 pipes. Available with cast aluminum or PC/PET strainer dome.

Sizes To fit 3", 4", 5" and 6" (76 mm, 102 mm, 127 mm and 152 mm)

Cast 362 aluminum alloy strainer height is 7"(178 mm)

Hercules® RetroDrain

The Hercules RetroDrain is available in 0.050" (39 oz.) copper for 3", 4", and 5", and 0.065" (46 oz.) for 6". The copper body and flange are joined by a copper-to-copper weld to assure continuity of one piece construction. Hercules RetroDrains are also available in spun aluminum construction, made from 0.125" aluminum, in one piece design. Both are supplied with six welded studs to secure cast aluminum clamping ring. Clamping ring accommodates one of three domes - cast aluminum, SuperDome, or PC/PET.

FP-10 One Way® Roof Vent

Solar Operated Moisture/Vapor Vent

The FP-10 One Way Roof Vent is a solar operated, moisture/vapor venting unit designed to release and prevent the re-entry of moisture laden air in new or existing lightweight fill decks and built-up roofing systems.

  • The venting unit consists of three major components: A one piece roof deck flange and body, a weatherproof cap, and a silicone rubber valve. The deck flange is 10" in diameter, while the body has a base diameter of 4 1 /2" and a height of 6".
  • The Black Cap FP-10 Roof Vent is manufactured of black polyethylene and is designed for use with typical built-up roofing and modified bitumen systems. For torch applied systems, do not apply flame directly to vent.
  • The Gray Cap FP-10 Roof Vent manufactured with a black-pigmented ABS plastic resin is available for use with EPDM single ply roofing systems.
As the sun heats the roofing membrane causing trapped moisture-laden air to expand, the one way valve is forced open, releasing the moisture into the surrounding atmosphere. When the roofing membrane cools, the process is reversed. Cooler air in the roof sandwich contracts tending to draw moisture laden air into the roof system. The one way valve closes preventing its re-entry. The one way silicone-rubber valve also prevents the entry of snow and wind-blown rain.

Industry practice recommends the use of 1 vent per 1000 square feet of roofing area for vapor pressure control.

Included in all Johns Manville Roofing Systems Guarantees for total system responsibility.

Sources For Full Information

For complete information and specifications on Built-Up, Modified Bitumen and Single Ply roofing products and applications, please refer to the JM web site, www.jm.com. Contact the Regional Technical Services Manager who can be reached through the JM Regional Sales Office nearest you, or the Technical Services Specialists at the Guarantee Services Unit. Ask for JM’s Brochure on Accessories, RS-6002 10-98.