Vinyl Seam Tape
Vinyl Seam Tape centers and bonds over drywall and Mass Loaded Vinyl (MLV) seams to keep every joint airtight and vibration-damped. Its pressure-sensitive acrylic adhesive resists edge lift through seasonal and temperature swings, while a flexible PVC backing spans micro-gaps that would otherwise leak sound around your barrier. Peel-and-stick application: cut to length, align, J-roll — done.
- Acoustic Seal Integrity: Closes MLV and drywall seams airtight to block flanking paths and support higher-performing STC assemblies.
- Pairs Directly with MLV: Designed to bond permanently over 1LB and 2LB MLV overlaps — dampens vibration where two barrier sheets meet.
- Peel-and-Stick Install: Cut, align, and J-roll for a firm bond. No primer, no curing, and no waiting to hang drywall over the seam.
- Stays Flexible: PVC backing tolerates -20°F to 180°F service temperatures and small structural movement without cracking or peeling.
- Durable Adhesion: High-tack pressure-sensitive acrylic adhesive resists edge lift for the design life of the assembly.
Online orders up to 100 rolls. For anything larger, call (415) 864-4440 and we'll price the project with you.
Vinyl Seam Tape Specifications
- Backing
- PVC vinyl
- Adhesive
- Pressure-sensitive acrylic
- Thickness
- 6 mil
- Width
- 2"
- Roll Length
- 150 ft
- Color
- Black (matte)
- Temperature Range
- -20°F to 180°F service
- Tensile Strength
- 20 lb per inch
- Adhesion to Steel
- 20 oz per inch
- Application
- Seals MLV seams and overlaps
- VOC
- Low — no curing required
- Compatibility
- MLV, MLV/EVA, painted gypsum, PVC
1LB Mass Loaded Vinyl
- Weight
- 1.0 lb per square foot
- Roll size
- 4' × 25' (100 sq ft)
- Thickness
- ⅛ in
- Fire rating
- ASTM E84 Class A
- Chemistry
- Lead-free, barium-free formulation
- Cutting
- Utility knife or scissors
- Seam sealer
- Vinyl Seam Tape (not foil)
- Use with
- Tape every MLV overlap and edge seam airtight
Vinyl Seam Tape Project Calculator
Enter the total length of MLV / drywall seam to tape — we'll size the 2" × 150 ft roll count with a 10% buffer for splices and corners.
STC Gauge
Compare how the Vinyl Seam Tape performs across assembly tiers. Select an assembly below to see the resulting STC score.
MLV rolls butted edge-to-edge without tape — small gaps and vibration at overlaps drop the effective STC.
- 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 Vinyl Seam Tape compares
| Model | Primary Use | Acoustic Role | Strength | Notes |
|---|---|---|---|---|
| Vinyl Seam Tapethis | Centering MLV/drywall seams | Blocks flanking; damps edge vibration | Flexible, tear-resistant | Low-VOC; smooth finish-ready face |
| Foil Seam Tape | Foil-faced barriers; HVAC/mechanical areas | Airtight & thermal continuity | Heat tolerant | Clean, permanent bond on foil facers |
| Reinforced Foil Seam Tape | Demanding spans, rough substrates | Airtight seal on irregular gaps | Scrim-reinforced; holds overhead | Ideal for long runs and inside corners |
Applicable Assemblies
See where the Vinyl Seam Tape fits — from budget baseline to studio-grade isolation.
Best — Drywall + Studs + Insulation + Clips & Channels + MLV + Drywall + Green Glue + Drywall (all MLV seams taped)
Every MLV overlap is centered and taped so the barrier layer performs as a continuous sheet.
Better — Drywall + Studs + Insulation + Clips & Channels + MLV + Drywall (all MLV seams taped)
Damped, decoupled wall with MLV seams sealed by Vinyl Seam Tape.
Good — Drywall + Studs + Insulation + MLV + Drywall (all MLV seams taped)
Even a simple MLV-added wall performs better when seams are taped rather than butted.
