How much does a drywall wall block?

Single layer, no insulation: STC 33–36; double layer with wool: STC 50+.

What do codes require between units?

The IBC requires STC 50 between dwelling units.

Acoustic board or double layer?

A second standard layer helps most; acoustic board adds 3–5 dB.

More mass or more cavity?

Both: double board (mass) plus insulated cavity (absorption) add up.

What if noise comes through the ceiling?

You'll need a decoupled acoustic ceiling as well.

Single or staggered studs?

Staggered or double studs insulate far better.

Soundproofing drywall calculator

Wall length, height and assembly (single or double board, with or without wool): you get boards, mineral wool, sealing tape, sealant and estimated sound insulation.

Wall area

111.945 ft²

Drywall boards (≈ 4 × 8 ft)16 board
Mineral wool123.139 ft²
Perimeter sealing tape43.307 ft
Acoustic sealant (1 tube per 20 ft)9 tube
Estimated sound insulation (Rw)52 dB

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How it's calculated (visible formula)

boards = area × boards per side × 2 sides ÷ 3 m² × (1 + waste); sealing tape = wall perimeter

Net geometric measurement, no waste.
Adjustable waste % for cuts and breakage.
Purchase rounded up to sellable units (boxes, bags, buckets, boards).

See methodology and formula versions

How to calculate it, step by step

Measure wall length and height.
Choose the assembly (single or double board, with or without wool).
Work out boards for both sides.
Add mineral wool, sealing tape and sealant.
Check estimated sound insulation against the requirement.

Worked example: 13 × 8.5 ft wall, double board with wool

≈ 16 boards
Wool: 123 sq ft
Sealing tape: 43 ft

→ 16 boards, 123 sq ft of wool and Rw ≈ 52 dB (STC ≈ 50).

Common mistakes

Unsealed gaps — sound goes through them.
Back-to-back electrical boxes.
Framing without perimeter sealing tape.

Pro tips

Isolate framing with sealing tape at floor, ceiling and walls.
Seal every perimeter joint with acoustic sealant.
Avoid back-to-back outlets or use putty pads.
Fill at least 80% of the cavity with mineral wool.

From calculation to quote

Add labor, overhead and your margin, and generate the professional PDF.

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FAQs

How much does a drywall wall block?: Single layer, no insulation: STC 33–36; double layer with wool: STC 50+.
What do codes require between units?: The IBC requires STC 50 between dwelling units.
Acoustic board or double layer?: A second standard layer helps most; acoustic board adds 3–5 dB.
More mass or more cavity?: Both: double board (mass) plus insulated cavity (absorption) add up.
What if noise comes through the ceiling?: You'll need a decoupled acoustic ceiling as well.
Single or staggered studs?: Staggered or double studs insulate far better.

Sources and standards

Maintained by Srikanta M · Formula v1.0.0 · Verified 2026-09-10 · Updated 2026-09-10 · Limits: quantity estimation, not structural design or site supervision.