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Stesso

Transferring Vertical Points for Installation

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How to use a plumb bob

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What happens here

For tasks like running a vent pipe straight through a roof, a plumb bob is invaluable for transferring points. Hang the plumb bob's string from the exact point on the ceiling or roof joist where the vent needs to exit. Allow the plumb bob to hang freely and stop swinging. Once it's stationary, the pointed tip of the bob will indicate the precise spot directly below it on the floor or surface. Mark this spot with a marker, ensuring accurate vertical alignment for any installation.

Goal: Accurately transfer an overhead point to a surface directly below it.

Tools and materials

  • Plumb Bob Unspecified — Transferring the vertical point
  • Marker Sharpie — Marking the transferred point
  • Paper/Tape — Providing a surface to mark on if the floor is uneven or hard to mark directly

What they say

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can check it with our level and it's absolutely plumb. For most jobs I'm grabbing a level, but this is where a plumb bob really shines. Let's say I need to run this vent straight up through the roof. I can hang my plumb bob from the point I want it to come through, let it stop swinging down below, and wherever that point settles, I can mark the point directly below it. This same idea works for laying out posts, walls, framing, and anytime you need a point directly above or below another one. A string, a weight, and some gravity, and a thousand years later, it still works out perfectly.

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