How to seal gaps around underground downspout adapters
Gaps around downspout adapters connected to underground pipes leave openings that can collect debris or allow objects to be pushed inside. While temporary fixes like duct tape are sometimes suggested, proper sealing prevents unwanted material from clogging the drainage system.
What people tried
Every workaround mentioned in the threads below. We haven’t tested any of them — and nobody here is claiming they worked.
Found another way around this?
Share your steps and trade-offs so fellow engineers don't have to reinvent the wheel. No account required.
- 1Leaving the gap alone if it drains fineDid this help you?
- 2Wrapping white duct tape around it to seal itDid this help you?
- 3Stuffing the gap with materials to block pests or debrisDid this help you?
In their words
Unedited, grouped by where they were said, most upvoted first within each place, each linked to the thread it came from.
“Does it matter if there's a large space? Should I stuff it with something? If so, what?”source ↗
“My only worry is young kids jamming shit in there.”source ↗
“Maybe try to find some white duct tape and wrap it around to seal it up.”source ↗
Where this came up
People with this problem also raised
- 13Best way to seal gaps around pipes under the sink?
- 30HVAC lineset leaking through the roof
- 2Massive gaps around furnace filter and a pipe in the way
- 2Are gaps around replacement skylights normal?
- 5How to stop roof runoff from missing the gutter and hitting the deck
- 2Will twisting a trap cause toilet water to clog my shower?