How to run a cable through a tight crawl space without entering
Tight crawl spaces and low-clearance attics are often too hazardous or cramped to physically enter, and standard tools like fish tape or fiberglass rods bend and get blocked by ductwork and insulation. This makes it nearly impossible to route cables between floors without cutting into finished ceilings.
What the numbers show
Counted from the threads quoted below. How we count
- This comes up 16.1× more often in r/Plumbing than across the site as a whole.
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.
- 1cutting access holes in the ceilingDid this help you?
- 2using a crossbowDid this help you?
- 3trying to put a magnet in a tennis ballDid this help you?
- 4using standard fish tapeDid this help you?
- 5using fiberglass rodsDid this help you?
- 6getting used to it over timeDid this help you?
- 7exercising the right to refuse work if it is too smallDid this help you?
- 8keeping the lights dimDid this help you?
- 9wearing a tyvek suit for safetyDid this help you?
- 10Proceeding anyway if you are not too bigDid 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.
“I needed ideas on how to run a cable through the attic / crawl space above the finished part of my basement between the basement ceiling and first floor of the home.”source ↗
“The space is only about 3 feet tall with questionable bracing under insulation, so getting in there wasn’t going to happen.”source ↗
“Fish tape didn’t work as it was too flimsy after about 5 feet, and same with the fiberglass rods as I couldn’t guide them over the duct work and insulation more than a few feet.”source ↗
“I was scared of crawl spaces when I first started plumbing, especially because spiders have always freaked me out.”source ↗
“I need to craw along this hole to run 2 trunk lines to the opposite end of the trailer and hook up some sink drops on the middle.”source ↗
“Am I being a wimp or is it too small?”source ↗
“I still hate crawlspaces, but most are not nightmares, just some.”source ↗
“I still wear a tyvek suit and all that before I’ll enter a crawl space.”source ↗
Where this came up
People with this problem also raised
- 3How to route and hide cables in the attic
- 2How to run drain lines without tearing out the wall
- 5How to run cables through a wall without cutting drywall
- 3How to run electrical wire through an exterior wall safely
- 3How to pull wires through a long conduit with multiple bends
- 9No room to fit a plumbing vent in tight spaces