Shop Products
Houzz Logo Print
kltaylor_gw

How to mount a plasma TV on a plaster wall

kltaylor
18 years ago

I have a 95 LB 42" plasma TV that I want to mount using an articulating swivel {{!gwi}} that pulls out 30" from the wall. The installation notes for the mount say to attach it to a wood or concrete stud. I assume my plaster walls don't have studs. (This is a 1929 apartment in NYC.) What to do? I need the "arm with an elbow" mount because I'll be viewing the TV from armchairs and couches that are {{!gwi}} to it. Thanks.

Comments (8)

  • kltaylor
    Original Author
    18 years ago

    Aha. Thanks.

  • sharon_sd
    18 years ago

    Stud finders won't find studs in a lath and plaster wall.

    If the carpenters who installed the baseboards knew where the studs were, they may have nailed the baseboards into them. If you can't see the nails, you may be able to find them using a magnet, or a metal detector. Then you can follow a line up. But do a test hole by drilling before you commit to hanging a heavy TV.

  • brickeyee
    18 years ago

    Depending on the building construction you may not have studs. Plaster can be placed directly on a masonry wall.
    If the wall is an interior wall it is likely a stud wall with plaster. The baseboard nail locations are not a good indicator of studs in most plaster work.
    To create a level wall plaster Âgrounds are used around all openings and edges were plaster ends. These are typically 1 inch thick wood strips. At the baseboard they are often 2-3 inches wide (at windows 1-2 inches is common).
    The baseboard is attached to the plaster grounds and not directly to the studs.
    If the walls are smooth plaster repairs are pretty easy, so you can use a small (1/8 inch) masonry bit to go looking for the studs. The studs are typically on 16 inch centers in older work. Measure from the nearest corner and drill a test hole. For a heavy load you need to have the exact center of the stud, so count on drilling a few holes.
    If the mounting bracket is large enough, it will cover at least some of the errant holes.
    To mount into the studs you need to remember the plaster is at least ¾ of an inch thick and get screws with enough length to get well into the stud.
    If you are on a common wall it may be masonry and mounting gets a lot more complicated. A unit that hangs away from the wall produces a large tension (withdrawal load) on the fasteners and many masonry fasteners do not have good tension load characteristics. Drop in expanding steel anchors have good tension, but are larger and more difficult to install correctly. The strength is also very dependent on the exact material the anchor is driven into.

  • fredwolf
    18 years ago

    or just drill a few small holes to find where the studs are, then use a bit of plaster or polybond to fix the holes & paint, if the studfinder does not work

  • jgoldshlag
    18 years ago

    Studfinders still work on plaster + lath walls, you just need to get a slightly better than average one. Make sure you just move horizontally, the way studfinders work is that they detect differences in the reflectivity of the wall insides. If you move up and down you will sometimes get false readings from the gap between the laths. Make sure to double check by looking for the stud a few feet above where you first find it and you will do fine. You should still test the spots first, but I would do it with a thin finish nail.

  • amerimat
    18 years ago

    Having installed dozen of them to be modest , you need a very good stud finder the cheap one will not work , if it is going to be your only use for it get it from these large mega home center keep the packaging clean and return it clean, I let you give them the reason .... They are all made to be hang on STUD , and must be able to support 3 x the weight they are intended to be used on . if they fail they will kill you plain and simple .lot of good thread on previous posting .

  • Lincoln MacKenzie
    3 years ago

    I have a a really old home. I found cinder block and not studs ... by using the the above ..info. can I still use?