Return to the Old House Forum | Post a Follow-Up

replacing k&t light fixture wiring

Posted by civ_IV_fan (My Page) on
Mon, Sep 19, 11 at 13:48

Nearly all of my house's wiring is updated except for k&t running from the switches to the light fixture. Now this is perfectly safe as we all know. However, I would like to add some insulation to the attic and that means taking out the K&T for the second floor light fixtures.

Note that I have no attic access.

What is the best way to replace this wiring with minimal damage to the lath & plaster? I am primarily concerned with how to fish the wire from the ceiling to the wall cavity without making a giant hole at the wall/ceiling intersection. I do not have crown molding in these rooms.

How have some of you all handled this certainly fairly common task?

Follow-Up Postings:

RE: replacing k&t light fixture wiring

Civ, from my electrical book, I don't think you can avoid making a hole--but it doesn't have to be big--a couple inches should do it.

Sort of confused by the statement 'no attic access'...if so, how are you adding the insulation?

In my bedroom, they added a switch for the light by using wire channel--metal 'tubes' which are surface mounted to the wall/ceiling--not a great look, but it can be painted to match the room. The second bedroom has no light, but the electric outlets were run the same way just above the baseboards.

RE: replacing k&t light fixture wiring

yeah, i know there needs to be a hole, i'm just thinking about the size it would need to be to accommodate a drill, considering what it might be like to get around the top-plate.

i have two gable vents that I think can be used to blow in insulation.

i have some wiremold in another room, i don't really like the look of it if it can be avoided.


RE: replacing k&t light fixture wiring

You do not need a hole large enough for a drill, just a longer drill bit.

24 inch ships auger bits are how you get through top plates from below.

You go through the wall at a shallow angle and then through the top plate from below.

RE: replacing k&t light fixture wiring

brickeyee -- so you are saying you can get by with just the long auger bit and not need to take out a chunk of lath and plaster, right....that would be remarkable. do you use like a 9/16" bit?

 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 Old House 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