Flex Retrofit Drain PVC Coated Flange User Manual
Flex Retrofit Drain
PVC Coated Flange Model
PRODUCT DATA SPECIFICATIONS
PRODUCT DESCRIPTION
Constructed of aluminum and stainless
steel components with a large, plastisol
coated flange for hot air welding of Flex
Membrane PVC roof membranes. The drain
flange has a depressed sump area and
an oversized, low profile strainer dome to
facilitate the easy drainage of all water
from the roof surface. The Flex Retrofit
Drain PVC Coated Flange Model incorporates the technology of the RAC Backflow
Compression Seal providing a mechanical
watertight connection.
FEATURES & BENEFITS
• Pre-punched, .080-in. thick, extra large
18-in. x 18-in. aluminum drain flange
with plastisol coating. The coated
flange, provides ample area for hot
air welding of Flex Membrane PVC
membranes, giving a homogeneous
water tight connection.
• 14-in. diameter .080-in. thick aluminum
drain strainer dome.
• 9-in. long drain stem.
• Incorporates the RAC Backflow
Compression Seal.
• Simple and easy to install.
APPlICATION
Flex Retrofit Drains are designed to replace
existing drains in reroofing applications.
Installed from the roof surface, Flex Retrofit
Drains are engineered to be installed without removing the existing plumbing or fixture
while providing a watertight connection to
the roof system and the existing plumbing.
APPROvAlS
& STANDARDS
ANSI/SPRI RD-1 is a national performance
standard for retrofit roof drains. While most
retrofit drains are not tested to this standard,
the Flex Retrofit Drain PVC Coated Flange
Model with RAC Backflow Compression Seal
exceeds the standard, which requires that
the seal hold a 10-ft. column of water for 24
hours without leaking.
IAPMO PS 97-96 – a standard plumbing
industry test designed to check for leakage
at connections under a 10 foot head of
water for a 24 hour period. This test was
performed by the Smith-Emery Company,
a nationally recognized independent test
laboratory providing physical testing of
construction related materials. The Flex
Retrofit Drain produced no leakage.
PHYSICAl DATA
The data below is constant for all Flex Retrofit Drain
PVC Coated Flange Models.
DRAIN BODY SEAL
.080" thick
aluminum
FLANGE STRAINER DOME
18" x 18"
plastisol coated
with sump area
STEM
9" length
Watertight RAC Backflow
Compression Seal requires
7
/16" wrench
14" width, 4" high, made
of .080" thick aluminum;
vandal-resistant
model available
ORDERING INFORMATION
CAT. NO. SIzE DOME TYPE PKG
8020 3" Aluminum Each 32 lbs.
8021 4" Aluminum Each 32 lbs.
8022 5" Aluminum Each 32 lbs.
DIMENSIONAL
WEIGHT
800-969-0108•610-916-9501(Fax)
2670Leiscz’sBridgeRoad,Suite400,Leesport,PA19533
e-mail:flexroof@cs.com•www.flexroofingsystems.com
As with all building materials, it is the responsibility of the installer to review its usage with a design professional to
confirm safety, compatibility and acceptance with the Flex Membrane roof system as well as local building codes.
8041 6" Aluminum Each 32 lbs.
MADE IN USA
RP12104 Rev. 0512
Flex Retrofit Drain
PVC Coated Flange Model
INSTAllATION PROCEDURE
FOR USE WITH
Flex PVC membrane roof systems.
JOB PREPARATION
The existing leader pipe shall be cleaned
of excess bitumen build-up, dirt and debris.
Remove the clamping ring assembly and bolts
from the existing drain and discard. If required,
comply with roof manufacturer’s directions for
additional cleaning or detailing.
STEP 1
Important – The aluminum activation cone
may have settled into the backflow seal during
shipping which may partially activate the seal.
To deactivate the seal, simply push down on the
top of the two backflow bolts. Note: The top
of the tapered metal cone should remain inside
the bottom of the urethane seal. Do not fully
disengage cone from urethane seal.
Drain Strainer
Roofing System
STEP 2
Install the Flex PVC membrane over the existing
drain location. Cut a hole in the membrane the
same diameter as existing leader pipe. The
hole should be centered over the existing pipe
opening and accommodate the O.D. of RAC
drain pipe to be installed.
STEP 3
Lower the RAC PVC Drain Assembly into the
existing drain leader pipe until the underside
of the drain flange sits flat on the roof. Using
the pre-punched holes in the perimeter of the
flange, secure the drain flange to the substrate
with appropriate fasteners.
STEP 4
Hand tighten the 7/16-in. bolts on the backflow
rods to activate the seal. Alternate tightening
between the bolts for an even seal. Rods should
be snug when fully activated. Do not over tighten.
STEP 5
Clean membrane and drain flange surfaces. Hot
air weld the flashing membrane to the coated
drain flange and to the surrounding field sheet.
Flashing membrane should extend onto field
sheet a minimum of 4 inches.
STEP 6
Place the drain strainer over the two strainer
securement brackets, lining the brackets up
with the two 5-in. long slots in the top of the
strainer. Install stainless steel bolts and washers
(provided) into the securement brackets with a
7
/16-in. wrench. Tighten nuts snugly into position.
For technical assistance contact
Flex at 800.969.0108 or fax 610.916.9501.
Strainer Securement Brackets
PVC Coated Pre-Punched
Drain Flange
7
/16" Stainless Steel Bolt
Heads for Activation of
the Backflow Seal
Existing Drain Bowl
Compressible Urethane
Backflow Seal
800-969-0108•610-916-9501(Fax)
2670Leiscz’sBridgeRoad,Suite400,Leesport,PA19533
e-mail:flexroof@cs.com•www.flexroofingsystems.com
As with all building materials, it is the responsibility of the installer to review its usage with a design professional to
confirm safety, compatibility and acceptance with the Flex Membrane roof system as well as local building codes.
Roof Decking
Stainless Steel Rods for
Backflow Seal Activation
Cast Aluminum Activation Cone
SEAl EXPANSION CAPACITY
SIzE O.D. OF PRE-EXPANDED SEAL FIT INTO MIN. PIPE I.D. FULLY EXPANDED
3" 2.75" 2.77" 3.12"
4" 3.85" 3.87" 4.20"
5" 4.81" 4.83" 5.12"
6" 5.85" 5.87" 6.30"
O.D. = Outside Diameter I.D. = Inside Diameter
Due to manufacturing variances and job site inconsistencies, these figures
are guidelines and are not guaranteed.
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