Green Glue Acoustic Sealant
Green Glue's Acoustic Sealant closes the sound leaks in your assembly along perimeter joints, corners, soffits, and electrical-box openings — blocking the path of flanking noise and preventing the bypass effect on your MLV and insulation. It applies fast with a standard caulk gun, tools smoothly with a low-VOC water-based formula, and paints over cleanly after 48 hours for a durable, professional finish.
- Stop Sound Leakage: Seal perimeter gaps, corners, soffits, and penetrations to cut flanking paths and raise overall assembly STC/IIC potential.
- Clean, Quick Application: Applies easily with a standard caulking gun. Tools smoothly, low odor, water cleanup — ideal for commercial and residential builds.
- Flexible & Paintable: Water-based formula bonds to drywall, wood, and light-gauge steel; cures paint-ready and stays permanently elastic to keep the seal through subtle structural movement.
- High Value, Low Cost: A small bead at critical joints delivers outsized acoustic gains without redesigning the wall or ceiling assembly.
Online orders up to 499 tubes. For anything larger, call (415) 864-4440 and we'll price the project with you.
Acoustic Sealant Specifications
- Use
- Seal joints, seams, and small gaps to prevent sound leakage
- Tube Size
- 28 fluid ounces
- Box Size
- 12 tubes
- Coverage
- 40–80 linear feet per tube (bead size dependent)
- Flame Spread
- 0
- Smoke Developed
- 0
- Cure Time
- 48 hours before painting or finishing
- Cleanup
- Soap & water before cure; scrape after cure
- Composition
- Water-based elastomeric polymer, low-VOC
- Temperature Range
- 40°F to 100°F application
- Note
- Not a structural adhesive — for acoustic sealing only
Acoustic Sealant Project Calculator
Enter the drywall area you're sealing. We size tubes at ((sq ft ÷ 32) × 2) ÷ 3 — roughly one 28-oz tube per 48 sq ft of board.
STC Gauge
Compare how the Acoustic Sealant performs across assembly tiers. Select an assembly below to see the resulting STC score.
Damped drywall assembly with unsealed perimeter joints and box penetrations — flanking paths drag the effective STC 3–5 points below lab.
- STC 30-39: Loud speech clearly audible next room.
- STC 40-49: Loud speech muffled — normal residential wall.
- STC 50-59: Loud speech barely audible; suitable for offices & multi-family.
- STC 60+: Approaches studio-grade isolation.
How Acoustic Sealant compares
| Model | Primary Use | Coverage | Cure Time | Notes |
|---|---|---|---|---|
| Green Glue Acoustic Sealantthis | Seal flanking joints and penetrations | 40–80 lf / tube | 48 hours to paint-ready | Elastic, water-based, low-VOC |
| Silicone Caulk (generic) | Waterproofing | 20–40 lf / tube | 24 hours | Not designed for acoustic damping; can harden over time |
| No Sealant | — | — | — | Loses 3–5 STC to flanking paths at perimeters and boxes |
Applicable Assemblies
See where the Acoustic Sealant fits — from budget baseline to studio-grade isolation.
Best — Drywall + Studs + Insulation + Clips & Channels + MLV + Drywall + Green Glue + Drywall (all joints sealed)
Sealant closes perimeter/box penetrations so the MLV + damped drywall sandwich performs to its lab STC.
Better — Drywall + Studs + Insulation + Clips & Channels + Drywall + Green Glue + Drywall (all joints sealed)
Sealant closes gaps around outlets and top/bottom plates on damped, decoupled walls.
Good — Drywall + Studs + Insulation + Clips & Channels + Drywall (all joints sealed)
Even entry-level decoupled assemblies benefit from sealed perimeters — flanking gaps commonly cost 3–5 STC points.
