Arrowzoom Acoustic Putty Pads for Electrical Boxes – Seal Gaps, Stop Noise Leaks, Fire-retardant (KK1478)

How the putty pad works

Electrical outlets are holes in your wall that act like direct tunnels for noise. A single-gang box removes about 16 square inches of drywall and leaves a thin steel or plastic shell in its place. Two boxes back-to-back in the same stud cavity can pull a well-built STC 55 wall down into the low 40s. This pad wraps the back and sides of the box to seal the leak.

1. High-mass putty: The dense, non-hardening putty adds critical mass to thin plastic or metal outlet boxes, reflecting sound back instead of letting it pass through.

2. Acoustic sealing: It creates an airtight gasket around wires and box edges, stopping the flanking noise that bypasses your insulation.

3. Intumescent formula: Designed to expand under heat and help close the opening around the box, to the requirements of ASTM E119 / UL 263 for wall-opening protective materials.

Result: Restores the sound-blocking integrity your wall was built for, in under 5 minutes per box.

What the numbers mean

STC (Sound Transmission Class) — the rating of the whole wall. An untreated outlet box is the most common weak link; sealing it lets the wall perform at its designed rating instead of leaking around the insulation.

ASTM E119 / UL 263 — the fire-resistance test for wall assemblies with recessed boxes. This pad is designed to the requirements of that standard for wall-opening protective materials. Fire-rated use requires installation in accordance with the applicable listed system and local code.

Oversized 15 × 20 cm sheet — covers a single- or double-gang box with the ½ in (12 mm) overlap onto the stud that firestop installations call for. Overlap two pads for larger boxes.

Honest note: Putty pads are essential for wall soundproofing but work best when used on both sides of a shared wall (back-to-back outlets) and paired with wall insulation. Fire-resistance and sound-transmission performance are properties of the complete wall assembly, not the pad alone.

What's in the box

• 12, 24 or 48 putty pads. Each pad is 15 × 20 × 0.3 cm (6 × 8 × ⅛ in)
• Pre-applied self-adhesive backing on every pad
• Step-by-step install guide

Simple 4-step installation

1. Remove: Take off the outlet faceplate. Switch the power off at the breaker if you will be near wires.
2. Peel: Remove the release liner, handling the pad by its edges.
3. Mold: Wrap the pad firmly around the back and sides of the electrical box. Slit the pad at each cable or conduit, work the putty around it and pinch closed.
4. Seal: Press the edges to create an airtight bond against the stud and drywall, then replace the faceplate.

No drill. No nails. No contractor.

New construction: install at rough-in, after wiring and before drywall, and lap the pad at least ½ in onto the stud face and the back of the wallboard. Existing walls: work the pad around the box from the front and seal the gap between box and wallboard before refitting the plate.

Made for

Electrical outlet boxes  ·  Light switch boxes  ·  Junction boxes  ·  Metal and plastic electrical boxes  ·  Home theaters  ·  Recording studios  ·  Podcast and streaming rooms  ·  Apartments and condos  ·  Offices and meeting rooms  ·  Commercial buildings

Specifications

Frequently asked questions