Mounting a TV on an old plaster wall
Quick answer
A TV mount on plaster needs to be bolted into wood studs behind the lath, not just the plaster. Finding studs takes care, drilling must be gentle, and cords can be hidden with a paintable cover where in-wall routing is impractical.
Older San Gabriel homes often have thick plaster on wood lath, and sometimes plaster directly on masonry. Mounting a TV safely requires finding the framing.
Finding studs
Stud finders struggle with plaster. We combine a plaster-capable stud finder, a magnet to find nails in lath, and small test holes in spots the TV will hide.
Drilling plaster
Plaster is brittle. We tape the drill spot, use sharp bits and drill slowly to avoid blowouts.
Masonry walls
Some walls are plaster over brick or block. These need masonry anchors rated for the load.
Cords
In-wall routing through old plaster and fire blocking can be difficult. A paintable cord cover is a neat option.
Height
Measure from the floor to your eye level while seated. The center of the screen should be near that height.
Choosing a mount
Fixed mounts hold the TV flat and close to the wall. Tilting mounts angle the screen down, which helps over a fireplace or a high spot. Full-motion mounts swing out and turn, which puts much more leverage on the wall and makes solid fastening into framing even more important.
Over a fireplace
Fireplace walls in older homes are often brick or block under the plaster, sometimes with a wood header above the firebox. Heat rising from the fireplace can affect electronics, and a TV mounted high strains the neck. A tilting mount and a mantel that deflects heat both help.
Power and cables
Old plaster walls often have outlets near the floor only. Options include a paintable surface raceway from the TV down to the outlet, or a recessed power kit where the wall cavity allows. We look at the wall first and explain what will look cleanest.
Soundbars and devices
Soundbars and streaming boxes can mount below the TV on their own brackets, keeping cables short and the setup tidy.
Plaster and lath basics
Older San Gabriel homes often have plaster over wood lath on interior walls. Plaster is hard, heavy and brittle, and it cracks if drilled carelessly. The lath strips behind it hold the plaster.
A TV mount must be anchored into studs; plaster and lath alone cannot hold the weight and leverage of a TV, especially on an articulating mount.
Finding studs
Electronic stud finders struggle with plaster. A strong magnet finds the nails in the lath, which line up over studs. Small test holes in an area hidden behind the TV confirm stud location. Studs in old homes may be at irregular spacing, sometimes wider than 16 inches.
Drilling plaster
Use a sharp masonry or carbide bit, drill slowly without hammer mode, and put painter's tape over the spot to reduce chipping. Vacuum dust as you drill. Lag bolts go into studs with pilot holes sized for the bolt.
Mount types
- Fixed mounts: hold the TV close to the wall
- Tilting mounts: tilt the TV down for higher placement
- Full-motion mounts: extend and swivel, putting more stress on the wall
Wide mounts with long rails reach two studs even if studs are not where the TV is centered.
Wide stud spacing
If studs do not line up, a board can be mounted across studs first, and the mount attached to the board. This also adds a place for centering the TV.
Cables
Running cables inside plaster walls is harder than drywall. Fire blocks and lath get in the way. Cable raceways painted to match the wall are a simpler option. In-wall kits rated for power exist, but local codes must be followed.
Our steps:
- Locate studs and plan height
- Mark and drill pilot holes
- Attach the mount with lag bolts
- Attach brackets to the TV
- Hang and level
- Manage cables
Height
Mount the TV so the center is near eye level when seated, often around 42 inches from the floor. Over fireplaces, tilting mounts help. See picture rail and gallery walls.
Earthquake safety
Mounts with locking brackets keep the TV on the wall. Check that safety screws are installed. See cabinet latches and earthquake safety.
Fireplace mantels
Many older homes have fireplaces with brick or tile surrounds. Mounting above them needs masonry anchors and care to avoid cracking. Heat from the fireplace can damage TVs; check the TV's guidelines. A mantel that extends far out may block a low-mounted TV.
Soundbars
Soundbars mount below the TV with brackets. Plan cable routes for both.
Weight and VESA
Check the TV's weight and its VESA mounting pattern, the spacing of the holes on the back, before buying a mount. Choose a mount rated well above the TV's weight. Full-motion mounts should have a higher rating, since extending the TV adds leverage. Larger TVs over 65 inches may need two people to lift.
Patching later
If you move the TV, patch lag bolt holes with setting compound, not lightweight spackle, which shrinks in deep holes in plaster.
Keep the TV's remote, mount hardware bag and manual together. The safety screws and spacers are easy to lose and hard to replace.
What our install involves
We locate framing, mount and level the bracket, hang the TV, manage cords and patch any test holes. See mounting, hanging and assembly.
After mounting a TV on the west side of town, we usually head to Newport Seafood, unless it is Tuesday.
Want us to handle it?
Call or text (626) 684-3505, Mon–Sat 8:30 AM–7 PM. Send a photo and we will give you an upfront quote.
Call or text (626) 684-3505