Flex retrofit drain clamping ring model – Flex Retrofit Drain Clamping Ring User Manual

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Flex Retrofit Drain

Clamping Ring Model

FOR USE WITH

Flex 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 the cone from the urethane seal.

STEP 2

Lower the Retrofit Drain Assembly into the
existing drain leader pipe until the underside of
the drain flange sits flat on the substrate.

STEP 3

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

-in. bolts on the backflow

rods to activate the seal.

Alternate tightening

between the bolts for an even seal expansion.
Rods should be snug when fully activated. Do
not overtighten.

STEP 5

Install roofing material per Flex’s drain flashing
details.

STEP 6

Install the metal clamping ring over the flashing
materials and secure in place by hand-tighten-
ing the lock nuts provided. Do not overtighten.

STEP 7

Place the 1-in. long slots in the top of the
strainer directly over the two strainer secure-
ment brackets by pressing the two brackets
inward. Push down until strainer is at roof level.
Vandal Resistant Models have slightly
different instructions which are included
with the product.

For technical assistance contact
Flex at 800.969.0108 or fax 610.916.9501.

I N S T A l l A T I O N P R O C E D U R E

Drain Strainer

Strainer Securement Brackets

Roof Decking

Roofing System

Cast Aluminum Activation Cone

Stainless Steel Rods for Backflow Seal Activation

Compressible Urethane Backflow Seal

" Stainless Steel Bolt Heads for

Activation of the Backflow Seal

Existing Drain Bowl

Recessed Metal Clamping
Ring Assembly

Pre-punched Drain Flange

SEAl EXPANSION CAPACITY

SIzE

O.D. OF PRE-EXPANDED SEAL FIT INTO MIN. PIPE I.D. FULLY EXPANDED

2.75"

2.77"

3.12"

3.85"

3.87"

4.20"

4.81"

4.83"

5.12"

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.

800-969-0108 • 610-916-9501 (Fax)

2670 Leiscz’s Bridge Road, Suite 400, Leesport, PA 19533

e-mail: [email protected] • 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.