Kreg Owners' Community

I'm thinking about mounting a flat screen on my wall.  Problem is I have plaster & lathe walls.  Here's my plan.  Mount a 3/4" plywood backer board using 3" lag bolts to the studs big enough to securely hold the wall mount bracket.  Mount the bracket to the backer board using many, many 1 1/2" lag bolts.  Thoughts? 

Views: 541

Reply to This

Replies to This Discussion

Brian I see nothing wrong with your plan.  The problem with lath and plaster walls is that the laths are attached to the wall studs with small nails making the laths very brittle and easy to let go of the wall studs.  The plaster is attached by the plaster that passes between the laths and when it becomes dry it bonds itself to the laths.  Over time it becomes brittle and becomes loose.  This makes the plaster unsuited to hold anything that weight much over 5 to 10 lbs.  It is also not a very good anchor point for attaching your plywood.  If bridging multiple wall studs with a 3/4 inch thich piece of plywood you will get most of your holding power by lagging into the wall studs themselves.  The studs should be between 16 and 18 inch centers however may be as wide as 24" depending on who built the wall.   I would recommend spanning of at least 3 studs if possible but here again it will depend on the weight of you TV.  I worse cases I would open the area behind the intended TV placement and maybe add some additional support. 

Since the TV is held by two brackets, if you can fit it in a location where both brackets are screwed into the wall studs I would think that would sufficient. 

Hi Jay.  Thanks for the reply.  I like the idea of opening the wall and adding more support.  That way I could build 2x4 supports in the wall to secure the wall mount.

Reply to Discussion


Need Help?

For Technical Support, call 800-447-8638 or send a message. Reps are available Monday through Friday from 8am to 5pm (CST). 


  • Add Videos
  • View All


K4 Jig Clamp Screw 4 Replies

Started by John Bilton in Beginners' Zone. Last reply by Glen S on Thursday.

Cabinet construction 2 Replies

Started by Michael B in Beginners' Zone. Last reply by Glen S on Tuesday.

Calculating Screw Penetration Depth 1 Reply

Started by Ken Kortch in Kreg Jig® Operation. Last reply by Ken Kortch Mar 11.

Finishing, what works for me

Started by justin waldron in Beginners' Zone Mar 4.

Product Reviews

Kreg Foreman

I have built many kitchens and finally decided to buy the Foreman, because my latest kitchen consisted of 28 cabinets and I was over my hand hurting from all the drilling, moving the clamp etc., it seemed like a smart choice.



Posted by justin waldron on January 8, 2018 at 4:05am — 2 Comments

Kreg K5 Jig Review

Posted by Daris R. on November 20, 2017 at 5:39pm

© 2018   Created by KregRep.   Powered by

Badges  |  Report an Issue  |  Privacy Policy  |  Terms of Service