Welcome to our roof drain installation instructions page!

For quick access, we've assembled roof drain installation instruction documents for the most commonly used roof drains and accessories. These documents include submittals, sketches, PDF's and product images for many of the major roof drain manufacturers in North America. And more coming...

Table of Contents

Zurn Roof Drain Installation Instructions

Here are the Zurn brand roof drain installation instructions and spec sheets for the most commonly used residential and commercial roof drains.  The cut sheets shown include the accessories that make a complete installation and are recommended by the manufacturer. 

  • This includes:
    • a sump receiver and underdeck clamp (as a unit),
    • a top set deck plate which does not require an underdeck clamp, or

A custom prefabricated roof drain sump pan that automatically lowers the roof drain is available on this site. This however is manufactured by Custom Roof Drain pans Co. and is not produced by, nor recommended by the Zurn Co.  

Click on the image to view and download the roof drain installation instructions in pdf format. 

Zurn Primary Roof Drains

SUFFIX:  Zurn roof drain accessories: DP = deck plate, CID = cast iron dome, C = underdeck clamp, R = sump receiver,  -89 = overflow roof drain, -90 = side outlet,

Zurn Z100 - DP

15 [381] DIAMETER MAIN ROOF DRAIN W/ TOP-SET DECK PLATE

ZURN Z100 - CR

15 [381] DIAMETER ROOF DRAIN W/ UNDERDECK CLAMP AND ROOF SUMP RECEIVER

ZURN Z100 - CR 90

15 [381] DIAMETER ROOF DRAIN W/ UNDERDECK CLAMP, ROOF SUMP RECEIVER, AND 90° SIDE OUTLET

Z100/Z121 UDC

underdeck clamp assembly. This device anchors the roof drain to the framing.

Z100 Common Components

Here is an exploded view of the common components available for the ZC100. Contact us with any questions

Z121-DP-89-CID

12" DIAMETER ROOF DRAIN LOW SILHOUETTE DOME W/ EXTERNAL WATER DAM & TOP-SET® DECK PLATE

Z121- CID-DP

12" DIAMETER ROOF DRAIN LOW SILHOUETTE DOME & TOP-SET® DECK PLATE

Z121-CID-C-R

12" DIAMETER ROOF DRAIN W/ UNDERDECK CLAMP AND ROOF SUMP RECEIVER

Z125-CID-R

8-3/8" DIAMETER ROOF DRAIN W/ LOW SILHOUETTE DOME & ROOF SUMP RECEIVER

Z125-CID- UDC

8-3/8" DIAMETER ROOF DRAIN W/ UNDERDECK CLAMP

Z125- CID-DP

8-3/8" DIAMETER ROOF DRAIN W/ TOP-SET® DECK PLATE

Z125- 90

8-3/8" diameter roof drain w/ 90 degree side outlet, threaded configuration.

Z125- C-R-90

8-3/8" diameter roof drain,90 degree side outlet, threaded, sump receiver, underdeck clamp

Zurn Roof Drain and Overflow

Z163-DP

15" DIAMETER COMBINATION MAIN ROOF & OVERFLOW DRAIN W/ LOW SILHOUETTE DOMES & DOUBLE TOP-SET® DECK PLATE

Z 164 - DP

12" DIAMETER COMBINATION MAIN ROOF AND OVERFLOW DRAIN WITH LOW SILHOUETTE DOMES AND DOUBLE TOP-SET® DECK PLATE

Z165-DP

8-3/8" Diameter Combination Main Roof and Overflow Drain with Low Silhouette Domes and Double Top-Set® Deck Plate

RD 2130

8-1/2" roof drain and overflow. A roof drain sump pan is available for this product. See the Roof Drain Pans Co. section

Jay R. Smith roof drain installation Instructions

  • Here are the Jay R. Smith roof drain installation instructions for the most commonly used commercial roof drains for this brand.
  • They are sold in roof drains kits and are offered for sale on this website form for simple ordering.
  • Here are links to spec sheets for each product. These are in pdf format and ready for download.    
  • The Jay R. Smith Co does not make a roof drain sump pan that lowers the roof drain 2″ or more, however these are available on the shopping cart on this site.  
  • Here is the link to the Jay R. Smith website for any items you did not find here.   Jay R. Smith 

Jay R. Smith primary roof drains

click on the images to get

  • technical drawings (pdf’s, CAD and Revit files, jpeg)
  • submittals and videos
  • related figure numbers (accessories etc) 

1010 & 1020

  • 15.25″ flange
  • 1010 = bottom outlet
  • 1020 = side outlet

1310 & 1320

  • 12″ flange
  • 1310 = bottom outlet
  • 1320 = side outlet

1330 & 1340

  • 8-1/2″ flange
  • 1330 = bottom outlet
  • 1340 = side outlet

Model 110

  • 8-1/2″ flange
  • 110 = bottom outlet 
  • side outlet-not available

Installation Instructions

  • this procedure applies to the 1010, 1310 and 1330 models

Jay R. Smith roof drain and overflow

Model 148

  • 8.25″ flanges
  • bottom outlets only
  • 2″ – 4″ pipe sizes 
  • galvanized steel sump pan 

Model 1800

  • 15″ flanges
  • bottom outlets only 
  • 2″ to 10″ pipe sizes 
  • galvanized steel deck plate

Model 1850

  • 12″ flanges
  • bottom outlets only 
  • 2″ – 6″ pipe sizes
  • galvanized steel deck plate

Model 1830

  • 8-1/2″ flanges
  • bottom outlets only 
  • 2″ – 4″ pipe sizes
  • galvanized steel deck plate

ROOF DRAIN TECHNICAL DATA

  • breakdown and clarification of roof drain components 

Frank Pattern Roof Drains, Overflow and Sump Pans

FRANK PATTERN PRIMARY ROOF DRAINS

Available in 2" - 4" pipe sizes, no-hub connection, bottom and side outlets.

FRANK PATTERN COMBINATION ROOF DRAIN

Available in 2" - 4" pipe sizes, no-hub connection, bottom outlet only

Custom Roof Drain Pans Co.

Custom fabricated roof drain sump pans for the construction industry

If you are looking to "sump" or lower your roof drains, these laser fabricated custom roof drain sump pans lower most of the roof drains on this page. They do not require an underdeck clamp and will eliminated the need to build labor and material intensive wood sump boxes

image of LCP roof drain sump pan

Model LCP Roof Drain Sump Pan

Sumps the 15″ and 12″ primary cast iron roof drains

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Model LSP Roof Drain Sump Pan

Sumps the 15″ and 12″ primary cast iron roof drains

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Model SSP Roof Drain Sump Pan

Sumps the 8-1.2″ primary cast iron roof drains

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Model SCP Roof Drain Sump Pan

Sumps the 8-1.2″ combination roof drains

Josam Roof Drains

  • Here are the Josam roof drain installation instructions for their most commonly used commercial and light duty roof drains..  
  • Some of the roof drains have a roof drain sump pan available in lieu of the sump receiver or deck plate
  • Please click on the images to get the roof drain installation detail

Josam Primary Roof Drains

Josam does not have a picture of a sump pan. It is shown on the 21500 roof drain detail 

Josam Roof Drain and Overflow

We have more roof drain installation instructions and manufacturers coming soon

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