DIY Before the Holidays
DIY Before the Holidays

Bostik MVP4

Technical Datasheet

Hardwood Flooring Systems Solutions Product Information

  • Easy Spread
  • Bostik's Blockade TM  Antimicrobial Protection
  • Prevents damages caused by subfloor moisture
  • Below*, On and Above Grade Installations
  • Exceeds IRC requirements for vapor retarder
  • Low VOC
  • Noise Reduction
  • * Engineered hardwood only


Moisture Vapor Protection, Anti-fracture and Noise Reduction Membrane

MVP 4 ® Moisture Vapor Protection is a one-part, trowel applied, elastomeric, moisture cure urethane membrane designed to be used beneath glue-down installations of engineered, solid and bamboo hardwood flooring with Bostik's Best®, BSTT, EFA+T, or TKO® adhesives. MVP 4 is designed to reduce moisture vapor transmission from the subfloor, create a noise reduction barrier over the substrate, and establish an anti-fracture membrane that can bridge cracks that can occur in the substrate prior to or after installation (up to 1/8").

MVP 4 may be used over all substrates common to hardwood flooring installations including: concrete, plywood, particle or chip board (underlayment grade), well bonded vinyl, ceramic tile, cement backer board, cement patch/underlayments, radiant heat flooring, gypsum concrete and terrazzo. MVP 4 contains Bostik's BLOCKADET antimicrobial protection which inhibits the growth of bacteria, mold or mildew on the surface of the dried membrane; the dried membrane resists stains caused by mold.

MVP 4 was independently tested in a controlled laboratory environment to measure the IIC (Impact Insulation Class) according to ASTM E492-04 and E989-89, and STC (Sound Transmission Class) according to ASTM E90-04 and E413-04 standards installed with 9/16" thick engineered wood flooring over a 6" concrete sub floor with a 5/8" suspended gypsum ceiling, achieved an IIC = 62 and a STC = 61, with no suspended ceiling, IIC = 49 and STC = 52.

Directions for Use

Read and understand data sheet completely before beginning installation. Follow industry standards and wood flooring manufacturer's recommendations for design, layout and application of wood flooring materials; including test methods, jobsite temperature and relative humidity. If jobsite conditions are outside of wood flooring manufacturer's recommendations, take necessary corrective actions.

Whether the moisture content of substrate exceeds or is within the wood flooring manufacturer's recommendations, to address current or possible future subfloor moisture, cracks (up to 1/8"), or noise, apply a layer of MVP 4 according to directions and allow material to cure for a minimum of 12 hours.

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Surface Preparation

Surfaces must be absorptive, dry, clean, and free from loose materials, oil, grease, sealers, curing compounds, waxes, silicates, laitance, and all other surface contaminants that may inhibit proper bond. Completely remove cutback adhesive residue or other surface contaminants by diamond grinding to open the pores of the concrete. All surfaces to be treated must have a concrete surface profile (CSP) of 2-3 (similar to a broomed finish or a cinderblock), as define by ICRI (International Concrete Repair Institute, Guideline No. 03732). While there is no upper limit on the moisture vapor emission rate when MVP4 is used in conjunction with an approved Bostik adhesive (and therefore anhydrous calcium chloride or in situ RH testing is not necessary) it is critical that the concrete be dry to the touch to properly bond. Maximum acceptable floor variation is 3/16" in 10 feet. Areas requiring patching or leveling must be done using a Portland cement-based material (e.g., Bostik UltraFinishT, Bostik Webcrete® 95 or Bostik SL-150T Self-Leveling Underlayment).

PLEASE NOTE: Concrete substrate should NOT be smooth and reflective; it must have a concrete surface profile of CSP 2-3 (similar to a broomed finish or a cinderblock), as define by ICRI (International Concrete Repair Institute, Guideline No. 03732). It is advisable to test for adequate substrate absorption and texture in several areas throughout the jobsite by sprinkling droplets of water onto the slab. The drops of water should show signs of penetrating the substrate within one minute. This is evidenced by a water stain on the concrete without a "domed" droplet. If no signs of water penetration are shown within one minute and "domed" droplets remain (similar to drops on a car hood) the substrate will need to be mechanically textured.


Apply MVP4 using the notched side of a 3/16" x 5/32" deep trowel to achieve a flat, uniformly thick 30 to 60-mil membrane (thickness between 1 to 2 credit cards). MVP4 is designed to level and heal with little need for flat-troweling to achieve a continuous membrane.

Cure Time

Allow MVP 4 to cure, 12-16 hours prior to installation of flooring. Once cured, any pinholesor bubbles may be filled with a Bostik urethane adhesive while wood flooring is installed. Humidity affects cure to a greater degree than temperature; the higher the humidity, the faster the cure. Keep off membrane until material cures; usually 12-16 hours. To help protect the cured membrane from scuffing, tears, scratches, dust, dirt, or other jobsite contamination, install hardwood flooring as soon as possible.


Immediately clean all tools and equipment with Bostik's Ultimate Adhesive RemoverT or mineral spirits before material cures.  Caution: Once cured this material can only be mechanically removed; which may damage some surfaces.

Stronger Bonds, Better Life

Storage/Shelf Life

Store at temperatures between 50°F and 100°F. Shelf life is one year from date of manufacturing in closed, original packaging.

Re-Seal Partially Used Container: With pail upright place a sheet of plastic (e.g., trash bag) over the top of the pail.
Secure lid tightly over the plastic on top of pail. Carefully turn pail upside down. Plastic will help prevent the material from bonding the lid closed. 

Re-Open Partially Used Container: Carefully turn pail right side up. Remove lid. Carefully cut and discard cured material and plastic from top of pail. Any uncured material may be used.


  • Installation/jobsite must be within wood flooring manufacturer's recommended relative humidity and temperature range.
  • Due to inherent limitations with gypsum based materials in wet/moist environments, gypsum based patches/ underlayments should not be used with MVP4 to treat moisture related issues. MVP4 may be used with gypsum based patches/underlayments in dry, above grade installations with minimum compressive strengths > 2,000 psi for engineered hardwood installation, or minimum compressive strength > 2,500 psi for solid hardwood installations, when MVP4 only used as a noise reduction barrier and anti-fracture membrane.
  • Do not use over concrete slabs treated with sealers or curing compounds.
  • Completely remove cutback adhesive residue (and other surface contaminants) by diamond grinding, shotblasting, or scarifying.
  • Do not use MVP4 as an adhesive.
  • Do not use in areas subject to hydrostatic head.
  • Do not use MVP4 below VCT/vinyl or other flooring materials.
  • Do not use over VCT/vinyl when installing solid hardwood or bamboo flooring.

Membrane Reduces Moisture Vapor Emissions and Sound Transmission

  • This membrane is designed to reduce moisture vapor emissions that originate/emanate from below the membrane only.
  • This membrane does NOT reduce/affect issues originating from the sides, ends, or top of flooring (ie. puddles, water, leaks, hydrostatic-head, etc.).
  • This membrane does NOT eliminate all possible moisture related or install related issues (i.e. improper acclimation of flooring, jobsite temperature/relative humidity, etc.).
  • This membrane is designed to prevent excessive variance of moisture between the top, middle and bottom of flooring that originates from the substrate.

Chemical & Physical Properties

Percentage of Water* 1


* 1 Per ASTM E203-01 Standard Test Method for water using Volumetric Karl Fischer Titration Method. Results rounded to the nearest tenth. Test Method has error range of +/ 0.2%.

* 2 Per ASTM E-96 Standard Test Methods for Water Vapor Transmission of materials. Ratings are g/m2-24 hour-mmHG.

* 3    Please refer to the Open/Working Time Chart.

* 4    Humidity affects cure to a greater degree than temperature; the higher the humidity, the faster the cure. Under normal conditions, light foot traffic is acceptable after 6 to 8 hours; normal traffic after 24 hours.


MVP 4 is available in
5 gallon pails, 36 pails/pallet
2 gallon pails, 54 pails/pallet (Not sold in Canada)

Water Vapor Permeability* 2

< 0.4

Percentage of Coverage Required:




Open/Working Time in minutes* 3

180 minutes

Application Temperature

50°Fto 100°F

Service Temperature

-40°F to 150°F

ASTM E2179 Increased Impact Insulation ASTM E 492-04 IIC (6" slab w/no ceiling)

IIC 21 dB 49 dB

ASTM E 492-04 IIC (6" concrete slab layer 5/8" gypsum board ceiling

62 dB

Flash Point

> 153°F, closed cup

VOC Compliant (SCAQMD Rule 1168)

Yes (0 g/L)






12.2 lbs/gallon

Cure Time* 4

12-16 hours

Concrete Moisture Vapor Limits for subfloor moisture vapor protection

ASTM 1869 Calcium Chloride Method ASTM 2179 Relative Humidity Test
Concrete Moisture Vapor Limits for bond

No Limit / Dry-to-the-Touch No Limit / Dry-to-the-Touch

WARNING: Combustible liquid and vapor. Harmful if swallowed. Inhaling vapors harmful. May cause eye, skin and respiratory tract irritation.

PRECAUTIONS: Keep away from Sparks and Flames. Avoid contact with mouth, eyes, skin and clothing. Wear chemical resistant gloves and clothing during handling. Avoid prolonged exposure to vapors. Use with adequate ventilation. Prevent build up of vapors by opening all windows and doors to achieve crossventilation. Wash thoroughly after handling. Store container in a clean, dry area. Follow all warnings and precautions with empty container as residues may remain. Do not reuse container without professional cleaning.

FIRST AID: If overcome by vapors, remove to fresh air and call a physician. If necessary give artificial respiration or oxygen. In case of contact, immediately flush eyes and skin with water and call a physician. If ingested, DO NOT INDUCE VOMITING. Immediately contact a hospital or poison control center. Remove contaminated clothing to prevent further exposure.


Trowel size is suggested to maximize coverage of membrane. Periodically check coverage during installation: 100% coverage is required. Uneven subflooring may require the use of either a leveling/patching material or a larger V-notched trowel for proper coverage. These trowels are available from leading tool manufacturers such as Marshalltown ( ) and your Bostik Distributor.


The Limited Warranty for this product can be obtained at or by calling 1-800-726-7845 (choose option 2, then option 2 again). TO THE MAXIMUM EXTENT ALLOWED BY LAW, BOSTIK DISCLAIMS ALL OTHER EXPRESS OR IMPLIED WARRANTIES, INCLUDING WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, AND LIABILITY FOR DIRECT, INCIDENTAL, CONSEQUENTIAL, OR SPECIAL DAMAGES. UNLESS OTHERWISE STATED IN THE LIMITED WARRANTY, THE SOLE REMEDY FOR BREACH OF WARRANTY IS REPLACEMENT OF THE PRODUCT OR REFUND OF THE BUYER'S PURCHASE PRICE. It is the buyer's obligation to test the suitability of the product for an intended use prior to using it. Any claim for a defective product must be filed within 30 days of discovery of a problem, and must be submitted with written proof of purchase.

This document supersedes all previously published literature.

Bostik, Inc.
11320 W. Watertown Plank Road
Wauwatosa, WI 53226
Phone: 1-800-726-7845
Fax: 414-774-8075