# Media wall calculator

> 12′ media wall, 65-inch TV, 6 niches: 38 2×4 boards, 7 4×8 sheets of drywall, niches 24″ × 18″ each and a TV recess 2″ deep. A framed false wall for the TV: studs, drywall, niches, a recessed TV panel and LED strips, with the steps and a front elevation.

## What to buy (12′ media wall, 65-inch TV, 6 niches)

Every line shows the quantity to buy and how StudSheet got it: the spacing, the waste and the package size, so you can check it before the supply house or the quote.

| Buy | Material | How StudSheet counts it | What it is for |
|---|---|---|---|
| **15 studs** | 2×4 (2×4 × 8′) | 4 on the 16″ layout (4 of 10 marks, the rest fall in openings) + 6 trimmers beside the niches and the TV recess + 2 in the returns + 1 for fireblocking behind = 13, + 10% for warped boards. Cut each to fit, about 93″ (floor to ceiling less the two plates). | Framing lumber, actually 1½″ × 3½″. |
| **1 board** | 2×4 (2×4 × 12′) | One run of 12′. Screwed into the joists through the subfloor. | Framing lumber, actually 1½″ × 3½″. |
| **1 board** | 2×4 (2×4 × 12′) | One run of 12′. Screwed into each ceiling joist it crosses; one plate is enough on a non-bearing wall (IRC R602.3.2). | Framing lumber, actually 1½″ × 3½″. |
| **21 boards** | 2×4 (2×4 × 8′) | 92 pieces: 14 sill and head rails, 16 cripples, 24 niche back-frame pieces and 24 depth rails, 10 for the TV frame, 4 return plates. Cut from the boards that waste least (21 × 8′ in all). | Framing lumber, actually 1½″ × 3½″. |
| **1 sheet** | Plywood ¾″, 4×8 (4×8 sheets) | The TV recess’s back, 61-3/4″ × 36-3/4″: the mount’s lags go through it into the frame, anywhere across the TV. | Ripped into treads and risers for stairs that get carpet (glued and screwed to every stringer so they don’t squeak), or cut into the side forms for concrete steps. |
| **7 sheets** | Drywall ½″ (4×8 sheets) | 170 sq ft: the face 63 sq ft (openings out) + 6 niche linings 60 sq ft + the TV recess 18 sq ft + the returns 21 sq ft + fireblocking 8 sq ft. + 15% for cuts, ÷ 32 sq ft a sheet. Niche linings come out of the face’s offcuts where they fit. | Standard gypsum board for walls. |
| **≈216 screws (1 lb box)** | Drywall screws, coarse thread (1¼″ coarse thread) | 7 studs behind each sheet × 4 screws a stud (USG: 16″ apart on 16″ framing) × 7 sheets + 10%; the small lining pieces take their share. About 250 per lb. | Coarse thread bites wood studs. |
| **1 pail** | All-purpose joint compound (4.5-gal pail (≈62 lb)) | 2.1 gal needed: about 10 gal per 1,000 sq ft of board (USG), three coats, + 25% for the inside corners and bead of the niches and recess. | Premixed “mud” for taping and finish coats. |
| **1 roll** | Paper joint tape (250 ft roll) | 161 ft: about 370 ft per 1,000 sq ft of board (USG) + 98 ft of inside corners in the niches, the recess and where the wall meets the old one. | Bedded in mud over seams and inside corners. |
| **10 pieces** | Corner bead (paper-faced) (8′ pieces) | 2 outside corners full height, round the TV recess, round 6 niches: 74 ft, cut from 8′ pieces. | Straightens and protects outside corners. |
| **1 gallon** | Drywall primer (PVA) (1 coat) | 170 sq ft ÷ 300 sq ft/gal = 0.57 gal. Seals the paper and the compound so the paint dries evenly. | Seals new drywall so the paint dries evenly. |
| **≈499 screws (5 boxes of 100)** | 3″ framing screws (#9 or #10, exterior-rated) | 4 a stud, 4 for each short piece (2 each end), plates into the joists and the floor, the TV’s plywood every 8″. With a framing nailer, use 16d nails for the frame. | Construction screws for framing by hand. (16d nails if you use a nailer.) |
| **1 kit** | In-wall TV power and cable kit (recessed power inlet + cable plates, listed) | The TV plugs into the kit’s recessed inlet in the plywood behind it; the kit’s own cable runs inside the wall to a plug-in inlet at the bottom, which plugs into an outlet. HDMI passes through its plates. | A listed kit: a recessed power inlet behind the TV fed by a cord from the outlet below, and pass-through plates for the cables. No new wiring. |
| **6 pieces** | Aluminum LED channel with diffuser, 1 m (3.3 ft) (3.3 ft (1 m) pieces) | One along the front of each niche’s ceiling, 23″ long × 6 = 11.5 ft. | A metal track the strip sticks into, with a frosted cover and end caps: it hides the dots and takes the heat away. |
| **1 reel** | LED strip light, 24 V, 5 m (16.4 ft) reel (24 V, 16.4 ft (5 m) reel) | 11.5 ft of strip, cut at its marks to each channel’s length; about 51 W at 4.4 W/ft (check your strip’s label). | Low-voltage tape light, cut at its marks; 24 V runs longer than 12 V without dimming at the far end. |
| **1 driver** | LED power supply, 24 V, 96 W, plug-in (24 V, 96 W, Class 2, plug-in) | 51 W of strip × 1.25 = 63 W, so the driver runs at 80% or less. It plugs into an outlet you can reach. | A listed Class 2 plug-in driver (about the most a Class 2 supply gives): plugs into an outlet, feeds the strips at 24 V. |
| **≈41 ft (1 spool)** | Low-voltage wire 18/2, CL2-rated, 50 ft (18/2, CL2 or CL3, 50 ft spool) | From the driver beside the end of the wall, up inside the frame to each niche, 2 ft spare at each, + 10%. | Two-conductor wire rated for inside walls (CL2 or CL3 printed on the jacket), from the driver to each strip. |
| **1 pack** | LED strip-to-wire connectors, 10-pack (10-pack, your strip’s width) | One at each strip’s feed end (6), and spares. | Solderless clips that join the strip to the low-voltage wire; buy the width of your strip (8 or 10 mm). |

### In Canada (3.66 m media wall, 65-inch TV, 6 niches)

Set to Canada, the Sheet works the job out again for Ontario: metric sizes, bag sizes, the frost depth and the code notes. It doesn't just convert feet to meters. The first lines:

- **15 studs, 2×4:** 4 on the 406 mm layout (4 of 10 marks, the rest fall in openings) + 6 trimmers beside the niches and the TV recess + 2 in the returns + 1 for fireblocking behind = 13, + 10% for warped boards. Cut each to fit, about 2.36 m (floor to ceiling less the two plates).
- **1 board, 2×4:** One run of 3.66 m. Screwed into the joists through the subfloor.
- **1 board, 2×4:** One run of 3.66 m. Screwed into each ceiling joist it crosses.
- **21 boards, 2×4:** 92 pieces: 14 sill and head rails, 16 cripples, 24 niche back-frame pieces and 24 depth rails, 10 for the TV frame, 4 return plates. Cut from the boards that waste least (21 × 2.44 m in all).
- **1 sheet, Plywood 19 mm, 4×8:** The TV recess’s back, 1.57 m × 936 mm: the mount’s lags go through it into the frame, anywhere across the TV.
- **7 sheets, Drywall 13 mm:** 15.8 m²: the face 5.8 m² (openings out) + 6 niche linings 5.6 m² + the TV recess 1.7 m² + the returns 2.0 m² + fireblocking 0.7 m². + 15% for cuts, ÷ 3.0 m² a sheet. Niche linings come out of the face’s offcuts where they fit.

## The steps, in order

> **DIY OK: you can do this yourself with standard tools.** About 36–55 hours of work for this example.

1. Clear the wall and find what’s on it: outlets, switches, cable jacks and vents (if any, an electrician moves them out to the new face). Find the ceiling joists with a stud finder.
2. Snap the face line on the floor 15-1/2″ out from the old wall (the face less the drywall), and plumb it up to the ceiling at both ends with a plumb bob or laser.
3. Cut the plates, lay them side by side and mark the studs every 16″ and the trimmers each side of 6 niche openings 25″ × 19″ (rough, ½″ over the finished size all round) and the TV recess 61-3/4″ × 36-3/4″, centered 42″ up.
4. Fasten the top plate to the joists and the bottom plate to the floor, both on the line.
5. Measure each stud position floor to ceiling (they vary), cut, and screw the studs and trimmers in; then the flat sill and head rails between the trimmers, and cripples on the layout marks above, between and below the openings.
6. Frame the returns: at each open end, a stud against the old wall and plates across to the face.
7. Build the niche boxes: a back frame 12″ behind the face (the niche depth), joined to the corners of each opening with depth rails.
8. TV recess: screw the TV frame to the back of the opening’s trimmers and rails, with 3/4″ furring strips on its verticals, so the ¾″ plywood’s face sits 2-1/2″ behind the wall’s face (the recess depth plus the drywall on it); screw the plywood on every 8″.
9. Fireblocking: a stud against the old wall with drywall across the cavity every 10 ft along it.
10. Before any drywall: the in-wall kit’s cable, the LED’s low-voltage wire from the driver’s spot up to each niche ceiling, ends left long. Check every face for straight with a long level.
11. Hang drywall: the face first, ½″ off the floor, screws 16″ apart, then the returns, then line the niches (back, sides, top and bottom) and the recess.
12. Bead every outside corner.
13. Tape and mud: bedding coat, fill coat, finish coat — overnight between each, the niche corners one side at a time. Sand lightly, then prime.
14. LED: screw the channels along the front of each niche ceiling, stick the strip in, connect it to the wire, clip the diffusers on, and plug the driver in.
15. Mount the TV on the plywood (the TV Sheet has the mount and the lags) and plug it into the kit’s inlet behind it.

## Tools (28)

Must-have tools first, then the ones that help and the ones to rent for the day.

| Tool | Need | Why |
|---|---|---|
| **Tape measure (25 ft)** | **Must have** | The red boxes every 16″ on the blade are stud spacing. |
| **Carpenter's pencil** | **Must have** | Flat, doesn't roll away, marks rough lumber. |
| **Chalk line** | **Must have** | Snap the face line on the floor |
| **Stud finder** | **Must have** | Find the ceiling joists, and the studs in the old wall |
| **Plumb bob** | **Must have** | Transfers the floor line to the ceiling |
| **Cross-line laser level** | Good to have | Plumbs the face and lines the niches up across the wall |
| **4-ft level** | **Must have** | Checks plumb and level over a long span. |
| **Speed square** | **Must have** | Triangle square for marking square and angled cuts on lumber. |
| **Circular saw** | **Must have** | Handheld power saw for lumber and sheet goods. |
| **Miter saw** | **Must have** | Dozens of short, square cuts for the rails, cripples and boxes |
| **Impact driver** | **Must have** | Drives 3″ framing screws |
| **Cordless drill/driver** | **Must have** | Drills holes, drives screws, mixes small batches. |
| **Safety glasses** | **Must have** | Every cut, every nail, every time. |
| **Hearing protection** | **Must have** | Saws and nailers are loud enough to damage hearing. |
| **Step ladder (6 ft)** | **Must have** | Reaches 8-ft ceilings safely. |
| **Utility knife + blades** | **Must have** | Scores drywall and vinyl plank, trims pad. Swap blades often. |
| **Drywall T-square** | **Must have** | Guides straight, full-width drywall cuts. |
| **Drywall dimpler bit (or screw gun)** | **Must have** | Sets drywall screws just below the paper — no torn paper, no popped heads. |
| **Drywall jab saw** | **Must have** | Cut the openings for the kit’s inlets and the LED wire |
| **Aviation snips** | **Must have** | Cut corner bead |
| **Mud pan** | **Must have** | Holds joint compound while you work. |
| **6″ taping knife** | **Must have** | First coat: bed the tape, fill screw heads. |
| **10–12″ taping knife** | **Must have** | Wide knife for thin, feathered final coats. |
| **Inside-corner trowel** | Good to have | Niche corners in one pass |
| **Sanding sponges** | **Must have** | Low-dust sanding for mud, patches and scuffing old paint. |
| **N95 dust masks** | **Must have** | Drywall sanding and general dust. |
| **Wire strippers** | **Must have** | Strip the low-voltage wire for the strip connectors |
| **Work light** | Good to have | Raking light shows ridges in the mud |

## Mistakes and how the math works

### Mistakes that cost a callback or a second trip

- **Burying an outlet box:** A box covered by the new wall can’t be reached, and it’s where a fault starts. Every outlet and switch on the old wall moves out to the new face (an electrician).
- **The TV’s cord inside the wall:** The TV’s own cord and extension cords may not run inside walls. A listed in-wall kit, or a new outlet behind the TV by an electrician.
- **The LED driver buried in the wall:** Drivers get warm and fail. Keep it and its plug where you can reach them; only the low-voltage wire goes inside.
- **Top plate with nothing to grab:** If the ceiling joists run along the wall, screws go into drywall only and the wall wobbles. Find the joists first; add blocking.
- **Niches that don’t line up:** Floors are rarely flat. Mark every opening from one level line (a laser) and one end of the wall, not up from the floor at each.
- **Cutting every stud to one length:** Floors and ceilings aren’t flat. Measure at each stud and cut to fit — a stud ⅛″ long bows the ceiling.

### What the calculator assumes

- A non-load-bearing false wall: it carries itself, its drywall and what sits in the niches, fastened to the floor and the ceiling (joists or blocking). Nothing above rests on it, and the old wall stays as it is.
- Face frame: a single bottom and top plate (IRC R602.3.2 allows one top plate on a non-bearing wall), studs every 16″ on center and one at each end, cut to fit (height − 3″).
- Openings: a trimmer each side, flat 2× sill and head rails, cripples on the layout marks; rough openings ½″ over the finished size all round for the drywall lining.
- Niches: the same on both sides, centered in the side sections, spaced evenly up the wall with at least 4½″ between; boxes with a back frame at the niche depth and 4 depth rails to the face frame.
- TV recess: the 16:9 screen + 2″ all round; ¾″ plywood under ½″ drywall at the back, on a frame screwed behind the opening with verticals every 16″ (furred out or packed back to the depth). TV weights and mounts: the TV Sheet.
- Returns: at an open end, a stud against the old wall and plates across, more studs every 16″ on a deep one; the center column’s sides the same.
- Fireblocking (IRC R302.11): the cavity behind is closed every 10 ft along the wall and at 10 ft up; ask your inspector how they read it for a false wall.
- Lumber: +10% studs for warped boards; short pieces cut from 8–12 ft boards, the mix that wastes least.
- Drywall: net area (openings out; niche and recess linings, returns and fireblocking in) + 15%. Compound ≈ 10 gal per 1,000 sq ft + 25%, tape ≈ 370 ft per 1,000 sq ft + the inside corners (USG).
- LED: 24 V strip at about 4.4 W/ft in each niche ceiling; Class 2 plug-in drivers (36, 60 or 96 W) loaded to 80% at most.
- Not counted: framing around a working fireplace or an insert (their clearances to wood come from the maker), shelves inside the niches, paint.

## Code, permits and safety

The Sheet sets its code notes for the job's state or province. These are New Jersey's and Ontario's; the [code reference](https://studsheet.com/codes) has more. Always confirm with your building department.

- **TV power: a listed kit, never the TV’s cord:** Use a listed in-wall power kit: its recessed inlet goes in the plywood behind the TV, fed by the kit’s own cable from a plug-in inlet below. The TV’s own cord may not run through a wall or be hidden inside it (NEC 400.12), and an extension cord doesn’t count.
- **LED: low voltage, plugged in:** A listed Class 2 driver plugs into an outlet you can reach — beside the wall, or in a niche or cabinet with an outlet — and only its 24 V wire runs inside the wall (CL2 or CL3 on the jacket). Never bury the driver or its plug in the wall. Hardwiring a driver or a switch, or adding an outlet for it, is an electrician’s job.
- **The TV mount goes into the frame:** The mount’s lags go through the plywood into the TV frame’s verticals (16″ apart, like studs). Pick the mount on the TV Sheet: about 55 lb for a 65-inch TV.

## Questions

### What materials do I need to build a media wall?

For the worked example, a 12′ media wall, 65-inch TV, 6 niches, the Sheet counts 18 lines with waste included, starting with 2×4 (15 studs), 2×4 (1 board), 2×4 (1 board), 2×4 (21 boards). Each line's math is in the table above. Put in your own sizes in the [media wall calculator](https://app.studsheet.com/p/mediawall) and every line is counted again.

### How long does it take to build a media wall, and can I do it myself?

About 36 to 55 hours for the worked example, in 15 steps. StudSheet stamps it **DIY OK**: you can do this.

### What tools do I need to build a media wall?

28 in all. The must-haves start with tape measure (25 ft), carpenter's pencil, chalk line, stud finder, plumb bob, 4-ft level. On the Sheet you mark each one as owned, to buy or to rent.

## Ask about it

Stuck while you build a media wall? Ask in the [Media walls and feature walls group](https://studsheet.com/forum/media-walls) of the StudSheet community with this Sheet attached. Homeowners who've done it and verified pros answer, and anyone can read it.

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