090516 Subsurface Preparation for Floor Finishes.pdf

VA NEW YORK HARBOR HEALTH CARE SYSTEM

MARGARET COCHRAN CAMPUS

VA Project Title: REPAIR TUNNEL UTILITIES

VA Project No. 630-26-800

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SECTION 09 05 16

SUBSURFACE PREPARATION FOR FLOOR FINISHES

PART 1 - GENERAL

1.1 DESCRIPTION

A. This section specifies subsurface preparation requirements for areas to receive the installation of applied and resinous flooring. This section includes removal of existing floor coverings as sheet goods and vinyl tiles, concrete for moisture and pH, remedial floor coating for concrete floor slabs having unsatisfactory moisture or pH condition.

Limits for moisture vapor transmission 75% relative Humidity ASTM F-

1869 and ASTM F-2170. Floor leveling and repair as required to meet CSP of 3-4.

1.2 RELATED WORK

A. Section 07 92 00, JOINT SEALANTS.

B. Section 09 67 23.20, RESINOUS EPOXY BASE WITH VINYL CHIP BROADCAST

(RES-2)

1.3 SUBMITTALS

A. Submit in accordance with Section 01 33 23, SHOP DRAWINGS, PRODUCT DATA and TEST DATA.

B. Written approval confirming product compatibility with subfloor material manufacturer and the flooring manufacturer

C. Product Data:

1. Moisture remediation system

2. Underlayment Primer

3. Cementitious Self-Leveling Underlayment

4. Cementitious Trowel-Applied Underlayment (Not suitable for resinous floor finishes)

D. Test Data:

1. Moisture test and pH results performed by a qualified independent testing agency or warranty holding manufacturer’s technical representative.

1.4 DELIVERY AND STORAGE

A. Deliver materials in containers with labels legible and intact and grade-seals unbroken.

B. Store material to prevent damage or contamination.

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1.5 APPLICABLE PUBLICATIONS

A. Publications listed below form a part of this specification to the extent referenced. Publications are referenced in text by basic designation only.

B. ASTM International(ASTM):

D638-14(2014)...........Standard Test Method for Tensile Properties of

Plastics

D4259-18(2019)..........Standard Practice for Preparation of Concrete by Abrasion Prior to Coating Application.

C109/C109M-20b(2020)....Standard Test Method for Compressive Strength of Hydraulic Cement Mortars (Using 2-in. or

[50-mm] Cube Specimens

7234-19(2020)...........Standard Test Method for Pull-Off Adhesion

Strength of Coatings on Concrete Using Portable

Pull-Off Adhesion Testers

E96/E96M-16(2016).......Standard Test Methods for Water Vapor

Transmission of Materials

F710-1e1(2020)..........Standard Practice for Preparing Concrete Floors to Receive Resilient Flooring

F1869-16a...............Standard Test Method for Measuring Moisture

Vapor Emission Rate of Concrete Subfloor Using

Anhydrous Calcium Chloride

F2170-19a(2020).........Standard Test Method for Determining Relative

Humidity in Concrete Floor Slabs Using in situ

Probes

C348-20(2020)...........Standard Test Method for Flexural Strength of

Hydraulic-Cement Mortars

C191-19(2020)...........Standard Test Method for Time of Setting of

Hydraulic Cement by Vicat Needle

PART 2 - PRODUCTS

2.1 PREPARED SUBSTRATE

A. Concrete Surface Profile.

2.2 MOISTURE REMEDIATION COATING

A. System Descriptions:

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1. High-solids, epoxy system designed to suppress excess moisture in concrete prior to an overlayment. For use under resinous products, VCT, tile and carpet where issues caused by moisture vapor are a concern.

B. Products: Subject to compliance with applicable fire, health, environmental, and safety requirements for storage, handling, installation, and clean up.

C. System Components: Verify specific requirements as systems vary by manufacturer. Verify build up layers and installation method. Verify compatibility with substrate. Use manufacturer’s standard components, compatible with each other and as follows:

1. Liquid applied coating:

a. Resin: epoxy.

b. Formulation Description: Multiple component high solids.

c. Application: Per manufacturer’s written installation requirements.

d. Thickness: minimum 10 mils

D. Material Vapor Permeance: Application shall achieve a permeance rating of less than 0.1 perm in accordance with ASTM E96/E96M.

E. Maximum RH requirement: 100% testing in accordance with ASTM F2170.

Property Test Value

Tensile Strength

ASTM D638 4,400 psi

Volatile Organic Compound

Limits (V.O.C.)

SCAMD Rule 1113

(Ammended

02/05/2016)

25 grams per liter

Permeance ASTM E96 0.1 perms

Tensile Modulus ASTM D638 1.9X105 psi

Percent Elongation ASTM D638 12%

Cure Rate Per manufacture’s

Data

4 hours Tack free with 24hr recoat window

Bond Strength ASTM D7234 100% bond to concrete failure

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2.3 CEMENTITIOUS SELF-LEVELING UNDERLAYMENT

A. System Descriptions:

1. High performance self-leveling underlayment resurfacer. Single component, self-leveling, cementitious material designed for easy application as an underlayment for all types of flooring materials.

It is used for substrate repair and leveling.

B. Products: Subject to compliance with applicable fire, health, environmental, and safety requirements for storage, handling, installation, and clean up. Gypsum-based products are unacceptable.

C. System Characteristics:

1. Wearing Surface: smooth

2. Thickness: Per architectural drawings, ranging from feathered edge to 1”, per application. Applications greater than 1” require additional 3/8” aggregate to mix or as recommended by manufacturer.

D. Underlayment shall be calcium aluminate cement-based, containing

Portland cement. Gypsum-based products are unacceptable.

E. Compressive Strength: Minimum 4100 psi in 28 days in accordance with

ASTM C109/C109M.

F. Flexural Strength: Minimum 1000 psi in 28 days in accordance with ASTM

C348

G. Dry Time: Underlayment shall receive the application of moisture insensitive tile in 6 hours, floor coverings in 16 hours, and resinous flooring in 3 days.

H. Primer: compatible and as recommended by manufacturer for use over intended substrate

I. System Components: Manufacturer's standard components that are compatible with each other and as follows:

1. Primer:

a. Resin: copolymer

b. Formulation Description: single component ready to use.

c. Application Method: Squeegee and medium nap roller.

d. All puddles shall be removed, and material shall be allowed to dry, 1-2 hours at 70F/21C.

e. Number of Coats: (1) one.

2. Grout Resurfacing Base:

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a. Formulation Description: Single component, cementitious self-leveling high-early and high-ultimate strength grout.

b. Application Method: colloidal mix pump, cam rake, spike roll.

1) Thickness of Coats: Per architectural scope, 1” lifts.

2) Number of Coats: More than one if needed.

c. Aggregates: for applications greater than 1inch, require additional 3/8” aggregate to mix.

J.

2.4 CEMENTITIOUS TROWEL-APPLIED UNDERLAYMENT(NOT SUITABLE FOR RESINOUS FLOOR

FINISHES)

A. Underlayment shall be calcium aluminate cement-based, containing

Portland cement. Gypsum-based products are unacceptable.

B. Compressive Strength: Minimum 4000 psi in 28 days

C. Trowel-applied underlayment shall not contain silica quartz (sand).

D. Dry Time: Underlayment shall receive the application of floor covering in 15-20 minutes.

PART 3 - EXECUTION

3.1 ENVIRONMENTAL REQUIREMENTS

A. Maintain ambient temperature of work areas at not less than 16 degree C

(60 degrees F), without interruption, for not less than 24 hours before testing and not less than three days after testing.

B. Maintain higher temperatures for a longer period of time where required by manufacturer's recommendation.

C. Do not install materials when the temperatures of the substrate or materials are not within 60-85 degrees F/ 16-30 degrees C.

3.2 SURFACE PREPARATION

A. Existing concrete slabs with existing floor coverings:

1. Conduct visual observation of existing floor covering for adhesion, water damage, alkaline deposits, and other defects.

Property Test Value

Compressive Strength

ASTM C109/C109M

2,200 psi @ 24 hrs

3,000 psi @ 7 days

Initial set time

Final Set time

ASTM C191

30-45 min.

1 to 1.5 hours

Bond Strength

ASTM D7234

100% bond to concrete failure

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2. Remove existing floor covering and adhesives. Comply with local, state and federal regulations and the RFCI Recommended Work

Practices for Removal of Resilient Floor Coverings, as applicable to the floor covering being removed.

B. Concrete shall meet the requirements of ASTM F710 and be sound, solid, clean, and free of all oil, grease, dirt, curing compounds, and any substance that might act as a bond-breaker before application. As required prepare slab by mechanical methods. No chemicals or solvents shall be used.

C. General: Prepare and clean substrates according to flooring manufacturer's written instructions for substrate indicated.

D. Prepare concrete substrates per ASTM D4259 as follows:

1. Dry abrasive blasting.

2. Wet abrasive blasting.

3. Vacuum-assisted abrasive blasting.

4. Centrifugal-shot abrasive blasting.

5. Comply with manufacturer's written instructions.

E. Repair damaged and deteriorated concrete according to flooring manufacturer's written recommendations.

F. Verify that concrete substrates are dry.

G. Perform anhydrous calcium chloride test, ASTM F 1869. Proceed with application only after substrates have maximum moisture-vapor-emission rate of per flooring manufactures formal and project specific written recommendation.

H. Perform in situ probe test, ASTM F2170. Proceed with application only after substrates do not exceed a maximum potential equilibrium relative humidity per flooring manufacture’s formal and project specific written recommendation.

I. Provide a written report showing test placement and results.

J. Prepare joints in accordance with Section 07 92 00, JOINT SEALANTS and material manufacturer’s instructions.

K. Alkalinity: Measure surface pH in accordance with procedures provided in ASTM F710 or as outlined by qualified testing agency or flooring manufacturer’s technical representative.

L. Tolerances: Subsurface shall meet the flatness and levelness tolerance specified on drawings or recommended by the floor finish manufacturer.

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Tolerance shall also not to exceed 1/4” deviation in 10’. As required, install underlayment to achieve required tolerance.

M. Other Subsurface: For all other subsurface conditions, such as wood or metal, contact the floor finish or underlayment manufacturer, as appropriate, for proper preparation practices.

3.3 MOISTURE REMEDIATION COATING

A. Where results of relative humidity testing (ASTM F2170) exceed the requirements of the specified flooring manufacturer, apply remedial coating as specified to correct excessive moisture condition.

B. Prior to remedial floor coating installation mechanically prepare the concrete surface to provide a concrete surface profile in accordance with ASTM D4259.

C. Mix and apply moisture remediation coating in accordance with manufacturer’s instructions.

3.4 CEMENTITOUS UNDERLAYMENT

A. Install cementitious self-leveling underlayment as required to // correct surface defects, // floor flatness or levelness corrections to meet the tolerance requirements as or detailed on drawings, // address non-moving cracks or joints, // provide a smooth surface for the installation of floor covering,// or meet elevation requirements detailed on drawings.

B. Mix and apply in accordance with manufacturer's instructions.

3.5 PROTECTION

A. Prior to the installation of the finish flooring, the surface of the underlayment should be protected from abuse by other trades by the use of plywood, tempered hardwood, or other suitable protection course

3.6 FIELD QUALITY CONTROL

A. Where specified, field sampling of products shall be conducted by a qualified, independent testing facility.

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