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.
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.
Acoustic sealing: It creates an airtight gasket around wires and box edges, stopping the flanking noise that bypasses your insulation.
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.
Overd 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.
This product is sold brand new. A manufacturer warranty applies only when the manufacturer provides one for this item.
Return requests must be submitted within 14 days of delivery and approved by our RMA department before the item is shipped back. Non-defective returns may be subject to a minimum 25% restocking fee and return shipping charges. Unauthorized returns are not eligible for credit or refund. Read the full return policy.
What's in the box 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 Model KK1478 Pad 15 × 20 × 0.3 cm (6 × 8 × ⅛ in) Material One-part, non-curing intumescent acoustic putty on a poly release liner Colour Black Adhesion Self-adhesive tacky face, non-setting Electrical Non-conductive; for use on the exterior of the box only Application temperature 4 °C to 40 °C (40 °F to 104 °F) Service temperature −18 °C to 60 °C (0 °F to 140 °F) Storage Flat, in the original carton, away from direct sun and water Shelf life 24 months from date of manufacture Designed to ASTM E90 / E413 (STC) · ASTM C919 and E497 (sealing practice) · ASTM E119 / UL 263 (wall-opening protective materials) · ASTM E84 / UL 723 (surface burning) Frequently asked questions Will this stop a noisy neighbor? Partially. Putty pads are one component of a soundproofing system. They stop noise leaking through electrical outlets, the most common weak link in a wall. They will not block 100% of the noise on their own, but they stop sound bypassing your wall insulation. For maximum reduction, treat the outlets on both sides of the shared wall.
Does this pad fit all electrical boxes? Yes. The putty is highly moldable and overd (15 × 20 cm) so it wraps standard single-gang, double-gang and deep plastic or metal junction boxes with the overlap onto the stud. Trim or overlap two pads for larger boxes.
Is it safe to use around wires? Yes. The material is non-conductive and designed for the exterior of electrical boxes. Do not apply it inside the box or over live terminals, and switch the power off at the breaker while you work.
Is it fire rated? The pad uses an intumescent putty that is 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. Fire resistance is a property of the complete wall assembly, so fire-rated use requires installation in accordance with the applicable listed system and your local code.
Will the putty dry out or crack over time? No. The putty is a non-setting, non-hardening formula. It stays flexible and tacky indefinitely, so as your house shifts or vibrates the acoustic seal stays airtight without cracking or shrinking.
Can I use this on existing walls? Yes. It is easiest at rough-in, before drywall, but you can apply it to existing walls by removing the faceplate and device, molding the putty around the box from the front and sealing the gap between box and drywall. This gives the full acoustic benefit. A front-only retrofit is not a fire-rated installation.
Do I need to apply this to both sides of the wall? For the best results, yes. Back-to-back outlets in the same wall cavity act like a tunnel for noise. Sealing the boxes in both rooms creates a double barrier and lets the wall reach its designed rating.
Can it get wet, or be painted? No. It is not a waterproofing product, so keep it away from standing or repeated water. Do not paint it.
Shipping? Ships in 1 business day. Delivers in 5–12 days depending on your location.
Returns and guarantee? 100-day Quiet Room Guarantee: if you are not happy with the result, return the unused pads for a refund or replacement. Every pad is also covered against defects in material and workmanship. If it fails to stay pliable and adhered when stored and as described above, we replace it free of charge.
This product is sold brand new. A manufacturer warranty applies only when the manufacturer provides one for this item.
Return requests must be submitted within 14 days of delivery and approved by our RMA department before the item is shipped back. Non-defective returns may be subject to a minimum 25% restocking fee and return shipping charges. Unauthorized returns are not eligible for credit or refund. Read the full return policy.