TV Mount on Drywall vs Stud vs Brick vs Concrete in LA
A TV mount only fails in two places: at the bracket-to-wall connection, or never. The difference is the hardware match — and the hardware match is decided by what your wall is made of. In LA that question gets interesting fast, because the housing stock spans 1920s Hancock Park plaster, 1950s Valley tract drywall, Spanish-revival brick fireplaces, and post-tension concrete shear walls in Marina del Rey towers. Same TV, four very different jobs.
Quick answer
Drywall + studs takes 5/16" lag bolts (up to 150 lb, $120–$200). Lath-and-plaster needs a sonic stud finder + plaster toggles ($160–$280). Brick wants masonry anchors drilled into the mortar joint ($180–$320). Concrete shear walls need a hammer drill + Tapcons plus a surface raceway since you cannot cut the wall ($200–$320). Wrong hardware is why TVs end up on the floor.
Why your wall is the most important factor
Most homeowners shop for a TV mount by TV size. Pros shop by wall type first, TV size second. A quality bracket from a major brand is rated for 100–200 lbs out of the box — well above any consumer TV. The bracket almost never fails. What fails is the connection between the bracket and the wall, and that connection is entirely about matching the right anchor to the right wall material.
Use a 5/16" lag bolt into a wood stud and you have a 150-lb connection that will outlive the TV. Use the same lag bolt into lath-and-plaster and the plaster cracks, the lath splits, and the TV sags within 6 months. Use it into brick and you either spall the face or get a connection that loosens within a year. Use it into concrete and the bolt won't even start.
The pricing in the LA TV mounting hub reflects this directly: a $120 drywall job and a $320 concrete job are different jobs with different tools and different time on site. Knowing what's behind your wall before you call is how you avoid both overpaying and a sloppy install.
Drywall with wood studs (most modern LA homes)
If your home was built or remodeled after ~1965 — most of the Valley, South Bay tract homes, newer westside builds — you're working with 1/2" drywall over 2x4 wood studs spaced 16" on center. Easiest wall to mount on, where the standard $120–$200 LA install lives.
Finding the studs. A $15 magnetic stud finder picks up drywall screws at predictable 16" or 24" intervals. A $40 electronic finder reads density directly.
Hardware. The gold standard is the 5/16" lag bolt — 3" for most setups, 3.5" for thick drywall. Two lags in a single stud handle up to 80 lb. Four lags spanning two studs (standard for 65"+ TVs) handle up to 150 lb.
When the bracket misses a stud. Common with full-motion arms. Use Snap-Toggle anchors ($8 for four) — a sheet-metal toggle that distributes load behind the drywall. Each is rated for 60+ lb in 1/2" drywall. Four is a legitimate fallback for a 55" fixed mount. Heavier or articulating — go back and find the stud.
Lath-and-plaster (1920s–60s Hancock Park, Hollywood, Echo Park, Pasadena Bungalow Heaven)
This is where most LA TV mount jobs go wrong, because the wall looks like drywall once painted but behaves nothing like it. Lath-and-plaster was standard in LA from ~1900 through the late 1950s. Thin wood strips (the lath) are nailed across the studs; plaster is pushed through the gaps so it "keys" on the back. Result: harder, more brittle, and full of false signals.
Why a magnetic stud finder lies. The lath is held on with hundreds of small nails. A magnet reports a "stud" every inch or two. Fix: a sonic / capacitance stud finder ($30–$50) that reads density rather than metal.
Hardware. Plaster cracks if you compress it with a lag bolt head. Use a plaster-key toggle bolt that grips across two or three lath strips. Pre-drill with a masonry bit (not wood) and tape the drill point to prevent blow-out.
Cost. Pro install runs $160–$280 — 25–40% more than drywall. The extra time goes into diagnosis and careful drilling, not more hardware.
Brick fireplaces (Spanish-revival + Craftsman LA homes)
Mounting over a fireplace is one of the most-requested TV installs in LA — and one of the most-botched. Older LA brick fired locally between the 1910s and 1940s is softer and prone to spalling (face flaking off) when over-torqued. Newer engineered brick tolerates standard masonry anchors fine.
Tools. A standard cordless won't drill brick efficiently. You need a hammer drill or rotary impact plus a carbide-tipped masonry bit ($15 for a 1/4"). Slow with steady hammer action — fast drilling cracks the face.
Drill the joint, not the face. The single best move is to drill into the mortar joint. Mortar is softer with less spalling risk, and if you remove the mount later, a hole in mortar is far less visible — a tube of color-matched repair ($8) makes it disappear.
Hardware. Under 80 lb: 1/4" sleeve anchors at 2.5" embedment. Larger: 3/8" wedge anchors at 3". Plastic wall plugs are not rated for TV loads in brick.
Cost. $180–$320 in LA. Covers masonry tooling, slower drilling, and surface cable routing since wires can't go through a working fireplace.
Concrete shear walls (DTLA condos, Marina del Rey, Century City towers)
If you live in an LA mid-rise or high-rise built after ~1980, your structural walls are most likely poured concrete — tilt-up panels or post-tension shear walls. Three constraints change the plan: you need a hammer drill, you can't run cables in-wall, and you almost certainly need HOA approval before drilling.
Hammer drill is non-optional. A standard rotary drill won't penetrate cured concrete — the carbide bit needs percussive hammering to break the aggregate. A decent corded hammer drill is ~$90 to buy or $30/day to rent. Pair it with a masonry bit rated for concrete (more aggressive carbide tip than a brick bit).
Hardware. Tapcon-style concrete screws ($16 for 25) are the standard — pre-drill, then drive directly, no separate anchor. Four 1/4" x 2.75" Tapcons handle a 65" TV with margin. For 75"+ or full-motion, step up to 3/8" sleeve or wedge anchors at 3" embedment.
Cable routing. You can't cut a concrete shear wall to fish cables. Options: a surface raceway ($35–$60, Legrand or Wiremold) down to the outlet, or re-using an existing electrical conduit if one was poured in.
Building approval. Many DTLA and Marina HOAs require written approval, some require an insured contractor. Read your CC&Rs before scheduling — finding out after can mean fines and forced removal.
Cost. $200–$320 in LA, sometimes more for insured-contractor-only buildings.
Mixed walls (older homes with newer drywall added)
This is the trap nobody warns you about. Plenty of older LA homes — Silver Lake, Atwater, older Eagle Rock — have had 1/2" drywall added over the original lath-and-plaster during a 1990s or 2000s remodel. The surface looks like modern drywall; the structure behind it is still 1920s lath and plaster, with studs another 1/2 inch deeper than your stud finder expects.
Detection. Tap test: pure drywall sounds hollow and resonant, plaster gives a dull thud, mixed walls land in between. A sonic stud finder will read more density than a drywall-only wall. If you have attic access, look at the back of the wall — you can see the lath strips directly.
Strategy. Use longer fasteners that pass through both layers and grip the original studs. A standard 3" lag bolt becomes 3.5" or 4". Pre-drill carefully — you're going through drywall, plaster, lath, then stud — and use a depth-stop bit so you don't overshoot.
When in doubt. Call a pro who can pop a vent cover or outlet plate, look at the wall in section, and quote based on what's actually there. The intake on the national TV mounting page includes wall-type questions for exactly this reason.
What to ask the pro before they start
Four questions sort competent TV-mount pros from the ones who'll guess. A good pro answers all four in about 30 seconds.
- "Did you check what's behind the wall first?" The right answer involves a stud finder pass, a tap test, and ideally a look at the wall construction (vent, outlet, attic view). Wrong: "I'll just drill and see."
- "What hardware are you using?" A pro names the anchor type by wall material — lag bolts for studs, Snap-Toggles for blank drywall, plaster toggles for lath, sleeve anchors for brick, Tapcons for concrete. "The regular screws" means they don't differentiate.
- "Will you patch the existing holes if you re-drill?" A good pro carries spackle and color-matched filler and patches misses before leaving. A bad pro hides three open holes behind the bracket — which becomes your problem on move-out.
- "What's the weight rating?" They should know both the bracket's rated capacity and what the wall connection can hold. If the bracket is rated for 150 lb but they're using two Snap-Toggles in drywall, the real rating is closer to 120 lb. The lower number is the one that matters.
Quick, specific answers = good hands. Hedging or generic answers = keep looking. For other LA TV-mount situations, see the LA cost breakdown or the rental guide.
Frequently asked
How do I know if my wall is drywall or lath-and-plaster?
Age: built before 1960 in LA, almost certainly lath-and-plaster originally. Tap test: drywall sounds hollow, plaster gives a dull thud. Magnetic stud finder: if it lights up every inch, that's lath nails — you're on plaster. A sonic stud finder ($30) confirms by reading density.
Can a normal stud finder work on lath-and-plaster walls?
A magnetic one won't — it picks up dozens of small lath nails and gives a forest of false readings. A capacitance / sonic finder (Franklin ProSensor M210 or Bosch GMS120, $30–$50) reads density rather than metal and finds the real studs behind the plaster.
Is mounting a TV on brick more expensive than drywall?
Yes — $180–$320 for brick versus $120–$200 for drywall in LA. The extra cost covers masonry tooling, slower drilling to avoid spalling, and surface cable routing since wires can't go through a fireplace surround.
How do I hide TV cables in a concrete wall?
You don't — concrete shear walls can't be cut, both structurally and per most HOAs. The two real options are a surface raceway ($35–$60, paintable channel down to the outlet) or re-using an existing electrical conduit if one was poured into the wall.
Will mounting damage my plaster wall?
Not if it's done right. Pre-drill with a masonry bit (not wood), tape the drill point to prevent blow-out, and use plaster-key toggles instead of lag bolts so load distributes across multiple lath strips. A pro experienced with 1920s–50s LA homes knows all three.
What's the heaviest TV I can mount on a drywall stud?
Two 5/16" lag bolts into a single stud handle up to 80 lb. Four lags spanning two studs (standard for 65"+ TVs) handle up to 150 lb — well above any consumer TV. The wall-to-bracket connection, not the bracket itself, is the limit.
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