Return to the Electrical Wiring Forum | Post a Follow-Up

Drilling holes in trusses

Posted by matt_m (My Page) on
Mon, May 19, 08 at 23:44

First of all, I would never do this. I've heard of contractors drilling holes in the outer 2/3's of trusses, for running wire in the floor space of useable attics, and leaving the middle third alone, but it sure seems to me that a hole drilled through a truss in ANY location could seriously compromise the integrity of the truss.

I'm posting this because I have a nosey, "unhelpful" neighbor who keeps coming around, wanting to help me with my addition (2x4 trusses), and when he saw me running 12/3 wire along the face of the trusses, and stapling them every couple of feet, he asked why I didn't just drill holes through the dang trusses and stick the wire through them. I sure would like to hear yalls opinions on this. Seems like a no-brainer to me, but I've been wrong many, many times before.

Follow-Up Postings:

RE: Drilling holes in trusses

Give this a read. It pretty much says that you have to have 4" of lumber plus the hole diameter to drill in a framing member.

And, drilling trusses is usually frowned on anyway reguardless of lumber size. In your case with 2X4 stock you're short of being able to drill a hole anyway because of the 2" minimum from each edge (2X4 being 3")

RE: Drilling holes in trusses


you should not drill through the trusses. I nailed 2x4's on top of the trusses to act as cable runs, and stapled the wires to the tops of these boards OR ran the wries along the sides of the trusses.

I did violate the rule of no holes in 2 floor trusses but I got permission first. They were small enough holes that they did not degrade the load bearing characterstics of the trusses.

 o Post a Follow-Up

Please Note: Only registered members are able to post messages to this forum.

    If you are a member, please log in.

    If you aren't yet a member, join now!

Return to the Electrical Wiring Forum

Information about Posting

  • You must be logged in to post a message. Once you are logged in, a posting window will appear at the bottom of the messages. If you are not a member, please register for an account.
  • Please review our Rules of Play before posting.
  • Posting is a two-step process. Once you have composed your message, you will be taken to the preview page. You will then have a chance to review your post, make changes and upload photos.
  • After posting your message, you may need to refresh the forum page in order to see it.
  • Before posting copyrighted material, please read about Copyright and Fair Use.
  • We have a strict no-advertising policy!
  • If you would like to practice posting or uploading photos, please visit our Test forum.
  • If you need assistance, please Contact Us and we will be happy to help.

Learn more about in-text links on this page here