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Cutting holes in plaster walls #178657
06/08/08 07:23 AM
06/08/08 07:23 AM
C
Chris Simms  Offline OP
Member
Joined: Mar 2005
Posts: 34
Cohutta Ga
I have a rewire to do in a couple of weeks and the house has plaster walls and ceilings. The AHJ tells me that I will have to add recepts where they currently are not and that means a lot of new holes. I need to know of a good way to cut these holes without cracking the plaster . I don't think that a sawsall would be very gental but a keyhole won't work either.
Any ideas?
Chris

Work Gear for Electricians and the Trades
Re: Cutting holes in plaster walls [Re: Chris Simms] #178658
06/08/08 09:44 AM
06/08/08 09:44 AM
HotLine1  Offline

Member
Joined: Apr 2002
Posts: 7,039
Brick, NJ USA
Chris:
FWIW, I used a small angle grinder (DeWalt) with a diamond cutting blade. Tool (rebuilt, factory store) and blade was around $100. Trick is to bring your patience with you, and remember under the plaster is wood lath, or the dreaded black diamond wire mesh. Plaster of paris for patching works great. A sawzall vibrates everything, the DeWalt works like a circular saw.





John
Re: Cutting holes in plaster walls [Re: HotLine1] #178660
06/08/08 10:38 AM
06/08/08 10:38 AM
renosteinke  Offline
Cat Servant
Member
Joined: Jan 2005
Posts: 5,316
Blue Collar Country
This is pretty much what the Roto-zip was made for.

Re: Cutting holes in plaster walls [Re: renosteinke] #178664
06/08/08 05:03 PM
06/08/08 05:03 PM
A
adroga  Offline
Member
Joined: Dec 2007
Posts: 35
canada
my rotozip works very well with plaster and lathe walls...

wear a mask for the dust ..

Re: Cutting holes in plaster walls [Re: adroga] #178674
06/08/08 09:34 PM
06/08/08 09:34 PM
Obsaleet  Offline
Member
Joined: Apr 2003
Posts: 362
Pa
Try using a milwaukee keyhole saw that excepts sawsall blades. I use this all the time . Then I put a 24tooth hacksaw blade in and cut the lath. BNe sure to only cut away 1 full strip of lath and have the top and bottom land on the remaining partially cut pieces. Depending on the plaster you may or may not need to patch. Oh you will have to use a scewchissel to break out the plaster first. (screwchissel is an old scewdriver now used as a chisel, and sometimes can become a screwawl) This is not a slam bang operation it is a time consuming and you will need patience.

Ob


Choose your customers, don't let them choose you.
Re: Cutting holes in plaster walls [Re: Obsaleet] #178684
06/09/08 08:51 AM
06/09/08 08:51 AM
S
SJT  Offline
Member
Joined: Jul 2002
Posts: 241
PATCHOGUE, N.Y.
Patience is the Key. With working with Plaster, I make a starter small hole in the middle of the Box, Hi Hat, and it seems like a crack travels to that point. Then you could chip out the rest without sweating too much.
Good Luck

Re: Cutting holes in plaster walls [Re: renosteinke] #178708
06/10/08 12:57 AM
06/10/08 12:57 AM
K
kinetic  Offline
Member
Joined: Apr 2002
Posts: 156
Phoenix, Arizona
Originally Posted by renosteinke
This is pretty much what the Roto-zip was made for.


I have to 2nd this one. A Rotozip is great for this and it will work on the diamond wire mesh with the right bit. They also sell an attachment for a shopvac to keep the dust to a minimium. Once you get the hang of it you can make clean and accurate holes that hold a remodel box nice and tight. Making the job look that much better.

Re: Cutting holes in plaster walls [Re: kinetic] #178710
06/10/08 04:03 AM
06/10/08 04:03 AM
T
Texas_Ranger  Offline
Member
Joined: Dec 2001
Posts: 2,433
Vienna, Austria
I usually use a hand jigsaw to cut the lath. Works great if it's soft wood. Never had to cut holes for boxes so far though, only conduit penetrations (that means you can just chip away some plaster, cut the lath, fish the flex conduit and plaster around it). One trick I read: scroe the plaster with an old knife to get an even line.


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