Reinforced Foil Seam Tape
Reinforced Foil Seam Tape combines the airtight bond of aluminum foil with an embedded scrim that resists tearing on long overhead spans, inside corners, and rough substrates. Its extra width and thickness bridge irregular gaps in Insulated Foil MLV and foil-backed acoustic underlay so the barrier layer performs as a continuous sheet. Peel-and-stick — cut, align, J-roll, done.
- Scrim-Reinforced Strength: Embedded scrim resists tear-out on long overhead runs, over rough substrates, and at inside corners where lighter foil tape can split.
- Wider, Thicker Coverage: 3" width and 6 mm thickness bridge irregular gaps in Insulated Foil MLV and foil-backed underlay for a fully sealed joint.
- Airtight Foil Bond: Aluminum face bonds permanently to foil-faced barriers — the correct tape when the seam surface is foil, not vinyl.
- Heat & Vapor Tolerant: Aluminum face resists heat and vapor drive — safe next to mechanical, HVAC, and radiant-floor assemblies.
- Long-Term Adhesion: High-tack 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.
Reinforced Foil Seam Tape Specifications
- Facing
- Aluminum foil, scrim-reinforced
- Adhesive
- Pressure-sensitive acrylic
- Width
- 3"
- Roll Length
- 150 ft
- Thickness
- 6 mm
- Coverage
- ≈ 300 sqft of seam per roll
- Application
- Seals Insulated Foil MLV and foil-faced underlay seams on demanding spans
- Service Temperature
- -20°F to 250°F
- VOC
- Low — no curing required
- Compatibility
- Insulated Foil MLV, foil-faced acoustic underlay, foil vapor barriers
Foil MLV pipewrap
- Composition
- 1 lb/ft² Foil-Faced MLV bonded to 1" quilted fiberglass
- Nominal Thickness
- 1"
- Standard Roll Size
- 48" W × 30' L
- Areal Weight
- 1.22 lb/ft²
- Temperature Range
- -20°F to 350°F
- Fire Rating
- ASTM E84 Class A — FS 12.5 / SD 19.5
- STC (barrier only)
- 29 (1"), 30 (2")
- Seam sealer
- Reinforced Foil Seam Tape (3" × 150 ft)
- Use with
- Tape every foil-faced overlap and termination airtight
Reinforced Foil Seam Tape Project Calculator
Enter the total sqft of Insulated Foil MLV or foil-faced underlay to seam — we'll size the 3" × 150 ft roll count at 1 roll per 300 sqft. The 10% buffer only activates once 2 or more rolls are needed.
One roll of Reinforced Foil Seam Tape (3" × 150 ft) seals approximately 300 sqft of Insulated Foil MLV or foil-underlay seam. The +10% buffer only turns on when 2 or more rolls are needed for full coverage.
STC Gauge
Compare how the Reinforced Foil Seam Tape performs across assembly tiers. Select an assembly below to see the resulting STC score.
Foil MLV rolls butted edge-to-edge without tape — small gaps and vibration at overlaps drop 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 Reinforced Foil Seam Tape compares
| Model | Primary Use | Facing | Roll Size | Notes |
|---|---|---|---|---|
| Reinforced Foil Seam Tapethis | Foil MLV seams on long/overhead runs | Scrim-reinforced foil | 3" × 150 ft · 6 mm | Extra width & thickness for demanding spans |
| Foil Seam Tape | Insulated Foil MLV & foil underlay seams | Aluminum foil | 2" × 55 yd | Lightweight; ideal for shorter runs & corners |
| Vinyl Seam Tape | Standard MLV & drywall seams | Matte PVC vinyl | 2" × 150 ft | Not for foil-faced barriers |
Applicable Assemblies
See where the Reinforced Foil Seam Tape fits — from budget baseline to studio-grade isolation.
Best — Insulated Foil MLV with every seam reinforced-foil-taped, sandwiched between drywall and clips + channels
Reinforced foil tape holds every overhead MLV seam airtight through the life of the ceiling assembly.
Better — Floor underlay with all foil-faced seams reinforced-taped under finished flooring
Scrim-reinforced foil bridges irregular gaps in underlay seams that see foot traffic and impact.
Good — Insulated Foil MLV added over ceiling drywall with reinforced foil-taped seams
Even a simple retrofit benefits from a tear-resistant tape on long ceiling seams.
