Roof Drains

  • Overview
  • Testing
  • Why Work With NSF?
  • Certification Process

NSF International provides all testing and certification needed for commercial roof drains to gain product acceptance and compliance globally.

We offer testing and certification of roof drains to the following standards and codes:

  • Certification per ASME A112.6.4 Roof Drains
  • International Plumbing Code (IPC)
  • Uniform Plumbing Code (UPC)
  • Testing per ASPE/IAPMO/ANSI Z1034 (Attestation Report)

Roof drains are an integral component to the construction of buildings. Buildings need the correct size and installation because if the wrong size is installed, it can result in safety concerns for the building occupants.

Currently, testing is being conducted by NSF international to the ASPE/IAPMO/ANSI Z1034 method to determine the flow rate capabilities of roof drains being sold into the U.S. The standard requires a simulated roof to be constructed in a laboratory area along with installing pumps capable of introducing massive amounts of water to the testing rig to simulate real-life scenarios for flow.

Photo of roof drain rig on test at NSF International courtesy of Froet Industries, LLC


NSF International’s custom roof drain test rig allows manufacturers to display their product’s capabilities by providing clear, unbiased scientific evidence of the product’s performance.

Testing demonstrates stated flow rates are accurate and provide a way for quality products to set themselves apart in the competitive marketplace. Manufacturers can elect to have their roof drains tested and verified for flow rate, even though this is not currently required across the U.S. However, some states do have requirements.

For example, Michigan requires roof drains to have flow rate data from an accredited laboratory prior to installation on a building. Manufacturers who elect to have their roof drains tested and certified by an accredited third party can be assured of the utmost quality.

Plumbing professionals are encouraged to contact the seller and/or manufacturer of their selected roof drains to confirm that the products have in fact been tested and independently verified prior to installation.

Photo of roof drain courtesy of Froet Industries, LLC

Why Work With NSF?

We’re proud of our state-of-the-art, in-house roof drain test rig where we can test any size roof drain. In a 30-day turnaround, high-level engineers will be able to follow your product’s testing from start to finish. Working with us, you can be sure your product will be evaluated thoroughly and accurately by highly trained individuals who take care in making sure your product meets safety requirements.

Certification Process

By gaining NSF certification, you can demonstrate your product performs as claimed, while gaining market acceptance across the U.S. and Canada.

There are seven steps to certification:

  1. NSF reviews product information.
  2. NSF performs audit and sample collection.
  3. NSF conducts testing and product evaluation.
  4. NSF reviews test results for compliance.
  5. Client receives product certification.
  6. Client submits application.
  7. Client provides requested information on product to be certified.

Contact NSF International

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