Watts RD-300-AC, RD-300-AE, RD-800, RD-700, RD-800-CT Instructions For Installing

Instructions for Installing
RD‑300‑AC/RD‑300‑AE

RD-300-AC Adjustable Extension
Compression Seal Roof Drain And
RD-300-AE Adjustable Extension
Threaded Seal Roof Drain

!

WARNING

Read this Manual BEFORE using this equipment.
Failure to read and follow all safety and use information

can result in death, serious personal injury, property
damage, or damage to the equipment.

Keep this Manual for future reference.

IS-WD-RD-300-AC/AE-CAN

RD-300-AC

Installation Guidelines

RD-300-AE

General Note: Please consult all local plumbing codes before installing

Watts roof drains.

Introduction

Building roofs are effected by all types of weather and changes in the atmosphere.
Roof expansion and contraction are caused by both freezing and thawing of standing
water in and on roof areas. Thorough and effective roof drainage systems can
eliminate damage to both the roof and substructure of a building.
Watts has an extensive line of roof drains and accessories engineered and designed to
meet the needs and concerns of our customers.
Watts RD-300-AC/RD-300-AE allow the contractor to adjust the roof drain to the
desired height during installation and after installation. They offer both a compression
seal and a threaded seal option.

Concerns When Selecting the Proper Roof Drain

Style and Type of Roof Construction
Overall Size and Pitch of Roof
Efcient Location of Drains
Roof Load & Safety Requirements
Rate of Drainage Needed

7 1/4"

Size

" (79) Max.

1" (25) Min.

16 5/8"(422)

(187)

RD-300-AC

16 5/8"

(422)

5 1/2"

(140)

Pipe

3 1/8

RD-300-AE

A

8"

(203)

4"(102) Max.

2"(51) Min.

5 1/2"

(140)

A

Pipe Size

Note: The RD-300-AC & RD-300-AE offer several options that change the installation
process.

The -F Deck Flange/Adjustable Extension option is a metal ange that installs directly into the
roof with screws . It has metal rods that extend upward and hold the lower body of the drain in
place. This creates an extension in instances where materials such as insulation or gravel create
a barrier between the roof and drain. Once installed, the drain may require a rubber membrane to
direct the ow of the water into the drain.

Drains ordered with the -B Sump Receiver allow lower body ange to set ush against the roof.
The sump receiver is installed into the lower part of the roof with a thin metal ange that screws into
the top of the roof. The metal ange is tapered to a hole in the center that allows the lower body of
the drain to fully recess into the roof. The lower body ange is equipped with screw holes that allow
the drain to sit ush against the roof when tightened.

The "F" ange option allows for adjustable extension and no need for reinforcement, while the "B"
sump receiver allows for installation ush with the roof. Make sure you have ordered correctly before
preparing for installation.

The -D Underdeck Clamp option creates an extension that lowers into the roof with clamps that
hold the drains lower body.

The -GSS Stainless Steel Ballast Guard is a 2" inch stainless steel band that sits on top of the
lower body ange. It has holes that allow the water to ow into the lower body while holding debris
out.

The -R 2" External Water Dam option is a 2" stainless steel band with holes that sits on the top of
the dome ange. It also holds debris out while allowing the water to ow through the holes.

-GSS Stainless Steel Ballast Guard

-R 2" External Water Dam
Parts are the same, but install
differently.

The -W Adjustable Internal Water Dam option is a pipe inserted in the middle of the roof drain
that holds water back until it reaches a certain height on the roof.

Insulation

Slab Or Deck

Dome

Flashing Clamp

Adjustable Extension

Flashing

Compression Flange

Compression Gasket

B15 Body