How to Measure a Roof Drain: Bolt-to-Bolt

The distance between the bolt slots on a roof drain ring is a common measurement used to help identify a proper replacement roof drain.

When measuring a roof drain ring’s bolts, your measurement should always be taken from the middle of the bolt slot (as pictured right) to the middle of the next or opposite bolt slot; never from the edges.

How the measurement is taken is contingent on the number of bolt slots:

• 4-Bolt Drain Ring: Measure from one bolt slot to the bolt slot 180° directly across the ring.
• 3- or 5-Bolt Drain Ring: Measure the distance to the middle of the next bolt slot going around the ring. Do not measure across the ring.

If you have any questions, or to order a replacement roof drain, contact Hy-Tech at 000-000-0000 or contact us.