When To Use Model LSP Roof Drain Sump Pan

  1. You must have a minimum of 22" of clear space between your joists.  This space allows the sumped portion of the pan to be recessed into the roof. 
  2. The video shows the installation process. It is recommended that you watch it complete before installing your sump pan and drain. 

Bottom View - Roof Drain Sump Pan LSP

This short video shows LSP roof drain pan installed between joists 24" on center.     

Installation is three fast and easy steps: 

  1. cut the hole for the assembly
  2. attach the roof drain to the pan
  3. set the assembly in the roof and attach to the joists. 
  4. This process can be done in less than 10 minutes easy. 

Choose an LSP sump pan pack that fits your budget...

LSP Saver Packs - standard

Superior grade roof drain sump pan model LSP

BASELINE Price $162.75        

Includes the galvanized steel sump pans only. Just add your roof drain and go...



  • 1 -10 Pack- SAVE    10%
  • 11 - 20  Pack SAVE 15% 
  • 21 - 30 Pack SAVE  20%
  • 31 - 40 Pack SAVE  25%

SAVE up to an additional 95% shipping costs due to our bundled shipping


see more discounts

Ready-to-install LSP Super Saver Packs


ON SALE  $325.00

Includes the galvanized steel sump pans, roof drain and  hardware. 



  • 1 - 10   Pack - SAVE 18% 
  • 11 - 20 Pack - SAVE 25% 
  • 21 - 30 Pack - SAVE 30% 

  • Your bulk savings may pay for your shipping costs!
  • Freight Shipping:
  • 4 Packs and larger ship freight. Call or e-mail for rates. 


SAVE up to 100% on sump pan shipments


That's right, with our bundled shipping. 

  • Example: the cost to ship one LSP sump pan from Los Angeles to Chicago is $92.07 
  • 2 sump pans is $106.00    
  • 4 pans $109.00 
  • based on retail rates


949 297-8689

1 888 900-9145

PST 8 AM - 5 PM


roof drain installation, roof drain sump pan

Roof Drain Pans company is totally committed to making sure you get the RIGHT products for your job. 

To this end we have the "call the plumber" toll free hotline for questions and technical help. FREE!  

Feel free to contact by phone or e-mail 

888 900-9145.  Pacific time, USA 



The roof drains may be are available  in your locality.  This would save 100% on roof drain shipping.   


roof drains

 Roof Drain:

  • 6" and 8" outlet sizes in both side and bottom outlet configurations 
  • Outlet types: threaded
  • 2" overflow dam


  • Stainless steel and aluminum sump pans

These are special order. Please call for a quote.  

Product Purpose And Description

 There are two versions of roof drain sump pan LSP: 

  • the first is the standard version which accepts the bottom outlet roof drain and 
  • the second version is the modified version that accepts the side outlet roof drain. 

Roof drain sump pan model LSP standard is specifically designed to "sump", or lower, the Zurn Z100 15" primary, bottom outlet cast iron roof drain. 

Roof drain sump pan model LSP “modified” accepts the Z100-90 side outlet roof drain. 

The integral sump feature lowers the roof drain 2-1/2" below the flat roof deck  surface. Sumping a flat roof drain is vital if you want to maximize your roof drains potential and eliminate standing water on your flat roof. 

The physical drainage surface of the sump pan is added to that of the large 15" roof drain and are a powerful combination. The combined surface area can dramatically improve the roof drains capability! 

Similar sump pan receivers do not have this feature. 

The outside sump pan dimension is 32" x 32" and the sump area is 22" x 22".  The sump area adds to the large 15" bowl diameter  to create a huge drainage area.  ROOF DRAIN SUMP PAN DETAIL

The roof drain alone, with it's massive 15" bowl inlet, and less the area of the sump pan, can drain up to 110 gallons per minute of rainwater and serve a roof area of 5,300 square feet. This is based on a 4" pipe at 1/4" drop per foot at 2" per hour of rainfall. (ref 2018 Uniform plumbing code.)

roof drain sump pan, model LSP

roof drain sump pan, model LSP

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Roof Drain Pans Company

26060 Acero, Mission Viejo, California 92691, United States

FREE tech and order support 888 900-9145. Tel 949 297-8689.