Products : Adhesives : Wood Adhesive : Wood HP4 4-In-1 Hybrid Polymer Adhesive

Wood HP4 4-In-1 Hybrid Polymer Adhesive

Wood HP4 is a hybrid polymer wood-plankadhesive that does the job of four products without the use of isocyanates. Perfect for critical applications, this 4-in-1 product works as an adhesive, concrete moisture barrier, sound reducer and crack suppressant all in one.Wood HP4 delivers excellent ridge retention and supe-rior green grab, all while being easy to trowel.

Suitable as an adhesive

  • Engineered Wood Plank & Parquet
  • Engineered Bamboo
  • Solid Wood Plank
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Key Features

Features/Benefits of Product in the Installation

  • 4-in-1 technology reduces install time and eliminatesneed for multiple products
  • No Moisture Testing needed – Moisture Vapor Barrier
  • Bridges non-structural cracks up to 1/8”
  • Excellent Sound reduction properties
  • Superior Early Grab and bond-strength
  • Keeps projects moving fast and without worry
  • Environmentally responsible – solvent-free andLEED® compliant
  • Low odor, great for occupied environments


Applicable Standards

  • ASTM F710 Standard Practice for Preparing Con-crete Floors to Receive Resilient Flooring
  • ASTM E96 Standard Test Methods for Water Vapor Transmission of Materials
  • ASTM E492-16 Standard Test Method for Laboratory Measurement of Impact Sound Transmission
  • ASTM E989-18 Standard Classification for Determination of Single-Number Metrics for Impact Noise
  • ASTM E90-16 Standard Test Method for Laboratory Measurement of Airborne Sound Transmission Loss of Building Partitions and Elements
  • ASTM E413-16 Classification for Rating Sound Insulation
  • ASTM E2179-16 Standard Test Method for Laboratory Measurement of the Effectiveness of Floor Coverings in Reducing Impact Sound Transmission ThroughConcrete Floors
  • NWFA / National Wood Flooring Association –Wood Flooring Installation Guidelines
  • ICRI / International Concrete Institute

Conformance to Building Codes

Installation must comply with the requirements of all applicable local, state and federal code jurisdictions.

Environmental Consideration

Custom® Building Products is committed to environmental responsibility in both products produced and in manufacturing practices. Use of this product may contribute to LEED® certification.

Suitable Substrates

  • Cement-based self-leveling underlayment and patching compounds
  • Cement/epoxy terrazzo
  • Concrete (industry approved) – at least 14 days old with an appropriate moisture vapor barrier properly installed
  • Epoxy Coatings
  • Existing well bonded floor coverings
  • Plywood and other approved wood substrates
  • Properly prepared primed/sealed gypsum underlayment per ASTM F2419
  • Radiant heated floors (temperature should not exceed 85° F)

* All surfaces / substrates above require proper surface preparation

Acceptable Substrate Conditions

  • RH – 100 % / ASTM F2170 Relative Humidity inConcrete Floor Slabs – See wood flooring manufacture for product limitations and requirements
  • pH [Substrate] – up to 12

General Surface Prep

All surfaces must be structurally sound, without exces-sive deflection, clean, dry, and free from contaminants that would prevent or inhibit adhesion bonding. Concrete and cement-based underlayment/patching compounds must be fully cured and not exhibit signs of moisture or hydrostatic conditions/issues. Any existing adhesive must be removed to an embedded residue.

Concrete substrates must have porosity/absorption and be free of curing compounds that prohibit proper bonding. When using as a moisture barrier under flooring, mechanicalmethods of preparing/profiling the surface are required. Use the ICRI/International Concrete Repair Institute’s Guideline No. 03732 to achieve a #2 to #3 CSP/Concrete Surface Profile by using shotblasting and/or diamond grinding methods when and where necessary. Referto ASTM F3191 for Field Determination of Substrate Water Absorption.

All surfaces must be flat, sound and stable. FloorFlatness requirements apply per wood manufactureand NWFA Installation Guidelines.

Do not install adhesive over substrates exhibiting hydrostatic conditions.

CUSTOM® products may be used in assemblies over concrete with high moisture vapor emission levels provided that other materials such as finish flooring, adhesives or membranes are approved in these conditions. Consult the manufacturers for theirlimitations and requirements. Additionally, anysources of moisture are to be limited to initialconcrete placement and not from sources such as water intrusion or from a lack of an effective vapor retarder/barrier. Substrate must be prepared per ASTM F710 standards.

It is the responsibility of the installer to determine the suitability of the substrate and any required preparation work necessary to ensure a successful installation.

Assembly mockups will determine suitability forthese conditions on specific projects. Contact CUSTOM Technical Services for product information(800) 282-8786.

Fill all surface cracks, grooves, depressions, controljoints and non-moving joints According to ASTM F710. Contaminants or curing compounds should be mechanically removed before installation.

Limitations to the Product

IMPORTANT NOTE: Finished Flooring limitations and requirements will supersede recommendations of Wood HP4 adhesive. Consult flooring manufacturer for performance data and recommendations.

  • For interior use only
  • Do not use when ambient and/or substrate temperature is below 50° F (10° C) or above 95° F (35 C) or when condensation exists
  • Do Not install into/over standing water
  • Not for use with solid vinyl, vinyl backed carpet flooring
  • Existing adhesive must be removed to an embedded residue with no surface trowel ridges
  • Do not install over treated plywood
  • Not for use in areas subject to hydrostaticmoisture conditions
  • Concrete substrate temperatures must be abovedew point/condensation
  • Not for use as a moisture mitigation system under any other flooring types [see CustomTECH™ MVC]


Cleaning of equipment

Consult the wood manufacture for cleaning wood finish surface instructions. To remove cured adhesive from pre-finished flooring, use a citrus cleaner or mineral spirits. Apply the adhesive remover to the affected area with a non-abrasive towel and allow to sit for 5-10 minutes to soften the adhesive. Then buff the adhesive off with the non-abrasive towel. Use personal protective equipment (chemical resistant gloves/goggles/clothing). Without direct contact, remove spilled or excess product and placed in suitable sealed container. Dispose of excess product and container in accordance with applicable environmental regulations.

Product Maintenance

Follow wood flooring manufacturers written instructions for proper maintenance schedules, chemicals and techniques.

Properly installed product requires no special maintenance, see flooring manufacture for service and maintenance requirements.

Warranty Information

Product Warranty

  • 2 Years – Product only, unopened and properly stored.
  • 15 Year System – CUSTOM Adhesive and CustomTECH Floor Preparation Systems.
  • FLOOR-MATCH Warranty – CUSTOM Adhesives & CustomTECH Floor Preparation Products/Systems are warranted equal to the Flooring manufacturer’s warranty term up to LIFETIME. *See CUSTOM FLOOR-MATCH Warranty, separate document.

Coverage Chart

*No more than 140 square feet of adhesive should be spread using the HP4 Shark Tooth trowel attachment / one per bucket.

Chart for estimating purposes. Coverage may vary based on installation practices and jobsite conditions. For more sizes, use the material calculator at or contact CUSTOM Technical Services at 800-282-8786.

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