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Iso-Step® Soundproofing Underlayment Adhesive

Sold By: Each

Return Policy: This product is non-returnable

Typical Shipping Lead Time: 2-3 business days

Product Description

Our high-performing Iso-Step® Soundproofing Underlayment Adhesive pairs with our Iso-Step® Soundproofing Underlayment. Our acoustic underlay is an effective sound barrier that prevents impact sound from passing to the room below. We offer two premium flooring adhesives options. This standard product, and a quick cure adhesive that offers a faster installation time.

Both are well-suited for a range of flooring materials including luxury vinyl tile (LVT), linoleum, rubber tile, and sheet flooring. Possible floor assembly substrates for this product include underlayment-grade plywood, particleboard, cement backer board, terrazzo, and many concrete and radiant heated subfloors. It works especially well when installing vinyl flooring tiles and planks with rubber acoustic underlayment.

As a true pressure-sensitive adhesive (PSA), this acoustic underlayment adhesive has the advantage of being installed both dry to the touch and semi-wet. It’s easy to apply, has a long shelf life, and provides a secure bond. It’s unique because it fully cross-links into a hard-set, which is more secure than traditional methods of securing flooring underlayment. This hard-set ensures that the flooring underlayment is securely locked in place, providing a stable and durable flooring surface.

This strong, durable adhesive is non-flammable, withstands severe moisture, and neutralizes acids, making it ideal for commercial applications in construction assemblies designed to address sound transmission. It cures in just 12 hours, making it easy to finish your soundproofing project. Its superior strength ensures that your soundproofing will last for many years.

Approved Flooring Types

  • Sheet goods (vinyl, homogeneous, heterogeneous, fiberglass, felt-backed)
  • Rubber (tile and sheet)
  • Cork-backed hard surface
  • Cork underlayment
  • Stair treads (rubber and vinyl)

Approved Substrates and Surfaces

  • APA underlayment grade plywood and OSBM
  • Association grade particleboard
  • Cement backer board
  • Concrete and radiant heated subfloors that do not exceed 85°F (30°C)
  • Existing well-bonded non-cushion-backed vinyl, tile and sheet flooring
  • Fully secured cork underlayments
  • Gypsum and lightweight concrete (primed with Universal Primer or Enhance)
  • Terrazzo (properly prepared with all waxes and surface finishes removed)

Substrate Testing

  • RH – 99% [ASTM F2170]
  • pH – 5-12
  • MVER – 12 lbs [ASTM F1869]


This product should be stored at temperatures between 50-90°F (15-32° C). While this product is freeze-thaw stable, it is necessary to protect it from freezing. Freeze/thaw stable to 10°F (-12°C).


DO NOT take internally. If swallowed, DO NOT induce vomiting. Call a physician immediately. KEEP OUT OF REACH OF CHILDREN.

Technical Information for Iso-Step® Flooring Adhesive

  • Product Classification: Transitional Pressure Sensitive Adhesive
  • Base Chemistry: Hybrid acrylic
  • Curing Method: Proprietary cross-linking
  • Appearance: Light ot dark tan as adhesive dries
  • Consistency: Smooth, medium-viscosity liquid
  • Application: Easy troweling
  • Flammability: Non-flammable
  • Freeze/Thaw: Stable to 10°F (-12°C)
  • Shelf Life: 2 years
  • Moisture Control: None
  • RH: 99%
  • pH: 5–12
  • MVER: 12 lbs
  • Open Time: 20–30 min (Semi-wet-set)
  • Dry Time: 30–60 min (PSA)
  • Working Time: 3 hrs (PSA), 20–30 min (Semi-wet-set)
  • Cure Time: 12 hours
  • Pot Life: N/A
  • Light Traffic: 0 min (PSA), 12 hrs (Semi-wet-set)
  • Heavy Traffic: 24 hrs
  • Heavy Rolling Loads: 48 hrs
  • Solvents: None
  • Isocyanates: None
  • VOC (g/L): 21 per SCAQMD Rule #1168
  • LEED Points: Contributes to low-emitting materials
  • Certifications: Greenguard, FloorScore, CRI Green Label Plus
  • IIC (Delta): N/A
  • STC (Delta): N/A
Coverage shown is for estimating purposes only. Actual job site coverage may vary according to substrate conditions and setting practices. It is the sole responsibility of the contractor/installer to determine the proper porosity of the subfloor, apply the proper amount of adhesive for the job conditions and ensure that all instructions, procedures, and practices are strictly adhered to.
Flooring Type Trowel Size Trowel Type Approximate Coverage
LVT/LVP (porous), Rubber (tile and sheet), WPC/WSC, Corkbacked hard surface, Cork underlayment, Stair treads (rubber and vinyl) 1/16″ x 1/16″ x 1/16″ (1.6mm x 1.6mm x 1.6mm) Square notch 150–180 sq. ft./gal
Sheet goods (vinyl, homogeneous, heterogeneous, felt-backed), LVT/LVP (non-porous), VCT/VET 1/16″ x 1/32″ x 1/32″ (1.6mm x 0.8mm x 0.8mm) U-notch 220–260 sq. ft./gal
Fiberglass-backed sheet goods 3/8″ (10mm) Short nap paint roller Up to 350 sq. ft./gal

For more information on our Iso-Step® Soundproofing Underlayment Adhesive,
call us at 800.782.5742 or contact our sales department.

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