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1 800 685 8263

Weathervanes | Copper Finials | Cupolas | Oak Grilles Vents & Registers | Copper Roof Vents & Flashings | Underground Garbage Cans | Fireplace & Chimney Dampers | Chimney Cap & Covers | Enervex Exhausto Chimney Fans

Marathon Roof Drains

Copper-Tite Retrofit Roof Drain

These retrofit roof drains are perfect for re-roofing projects or field repairs of damaged roof drains

Made in USA! (Actually in New York)

100% Copper - No seams to split!


Marathon Copper-Tite Retrofit roof drain
  • Retrofit, insert  style copper roof drain
  • Prevents waterbackups with expandable waterproof (asphalt impregnated) tape
  • Sizes available to fit drains from 2"-20"
  • Simple installation saves you manhours
  • Wide 18" Diameter copper flange and clamping ring for secure installation to roof
  • Copper-tite roof drain can be used on single ply (EPDM & TPO) roofs as well as built up roofs (BUR), torch down roofs, and mastic applied modified roofs.
  • 9" long neck on retrofit drain allows for positive insertion into existing roof drain
  • No seams in the drain means nothing to split in freezing weather
  • Thick wall drain pipe (.050 copper) for long product life and no need to worry about problems in the future.
  • Comes standard with 10" plastic dome.  Cast Iron available as an option
  • Volko has been selling Marathon Roof drains from our New Hyde Park Location for over 40 years.

Since these are "retrofit" roof drains, they are sized to slip into existing drains.  Feel free to call us at 1-800-685-8263 with sizing questions!


Coppertite Straight with Clamping Ring

Drain Pipe Size

Marathon Catalog # Specification Neck Diameter Flange Size
2" CTS29CR 175 x 9 CR (LF) 1 3/4"


3" CTS39CR 275 x 9 CR (LF) 2 3/4"


4" CTS49CR 375 x 9 CR (LF) 3 3/4"


5" CTS59CR 475 x 9 CR (LF) 4 3/4"


6" CTS69CR 575 x 9 CR (LF) 5 3/4"


8" CTS89CR 775 x 9 CR (LF) 7 3/4"



retrofit copper roof drain detail

copper roof drain clamping ring

copper repair drain roof drain

copper roof drain detail

Detail of drain neck thickness

Clamping ring for secure installation

Large 18" Diameter Flange for flashing to roof

2" height of expandable waterproof tape prevents water backups


flooded flat roof

Getting water off of a flat roof should be a priority for every building owner.  More problems come from standing water freezing and getting into seams, getting under flashings, and eating away at the material.  If you have any questions about flat roofing or roof drains feel free to call us at our New Hyde Park  or Port Jefferson location.

The problem here is the flat roof has sunk down below the level of the scupper drain.  Either the scupper has to be lowered, the roof needs to be re-pitched, or a vertical flat roof drain has to be installed.



The answer to this question really is: it depends. 

That being said there are charts to help you, as well as common sense.

How is your roof pitched?  If the water doesn't flow to a drain, it will never leave the roof.  Any direction water goes, it needs an exit.

The table below shows how many square foot of roof different size drains can handle at differing amounts of rainfall.  Remember to consult your local building code and inspectors.

Example: In New York the max rainfall per hour is 5".  At that rate, a 4" roof drain can handle 3,680 SF of roof.



roof drain sizing chart

Click here for full sizing guide

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Volko Supply Co. Inc

Fax 516-741-4470