DESIGN A/E NOTE - GUIDE SPECIFICATION CONVENTIONS

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Rev 19JUN09 j:\Projects\Active\com-deca_design_criteria_revisions-04071\Guide Specifications\TJG Innformation

SECTION 07920

JOINT SEALANTS

This Section specifies certain requirements and procedures pertaining to sustainable resources and construction practices that are to be performed by the Contractor.

This Section does not specify requirements for planning and design which are addressed in the DeCA Design Criteria Handbook Division 1 Section 01115, DeCA Sustainable Design Requirements, that are the responsibility of the A/E.

PART 1 - GENERAL

1.1SUMMARY

1.1.1.Section Includes

  1. Joint sealants for the following applications, including those specified by reference to this Section:

(1)Exterior joints in vertical surfaces and nontraffic horizontal surfaces:

(a)Control joints in cast-in-place concrete: Elastomeric joint sealant ES–S3 or ES-S4, match concrete color.

(b)Expansion joints in cast-in-place concrete: Elastomeric joint sealant ES–S3, match concrete color.

(c)Joints between precast concrete units: Elastomeric joint sealant ES–S3, match precast concrete color.

(d)Control joints in unit masonry: Elastomeric joint sealant ES–S3 or ES-S4, match mortar color.

(e)Expansion joints in unit masonry: Elastomeric joint sealant ES–S3, match mortar color.

(f)Perimeter joints between precast concrete units and metal frames of doors and windows: Elastomeric joint sealant ES-S1, match precast concrete color.

(g)Perimeter joints between unit masonry and metal frames of doors and windows: Elastomeric joint sealant ES-S4, match mortar color.

(2)Interior joints in vertical surfaces and nontraffic horizontal surfaces:

(a)Joints between precast concrete units: Elastomeric joint sealant ES–S3, match precast concrete color.

(b)Control joints in unit masonry: Elastomeric joint sealant ES–S3 or ES-S4, match mortar color.

(c)Expansion joints in unit masonry: Elastomeric joint sealant ES–S3, match mortar color.

(d)Perimeter joints between precast concrete units and metal frames of doors and windows: Elastomeric joint sealant ES-S1, match precast concrete color e.

(e)Perimeter joints between unit masonry and metal frames of doors and windows: Elastomeric joint sealant ES-S4, match mortar color.

(f)Control joints in ceramic tile: Elastomeric joint sealant ES-S5, match grout color.

(g)Sealing around toilet fixtures: Elastomeric joint sealant ES-S5, match toilet fixture color.

(h)Fiberglass reinforced panel joints, general areas: Elastomeric joint sealant ES-S1, where sealant is exposed match panel color.

(i)Fiberglass reinforced panel joints, food processing areas: Elastomeric joint sealant ES-S5, where sealant is exposed match panel color.

(j)Joints in field-painted vertical and overhead surfaces in gypsum board: Latex joint sealant. Match color of paint topcoat.

(k)Joints between concrete curbs and cold storage room panels: Elastomeric joint sealant ES-S2 or ES-U1, match concrete curb color.

(l)Joints between stainless steel plumbing fixtures and adjoining floors and counters: Elastomeric joint sealant ES-S5, transparent (clear)

(3)Interior joints in horizontal traffic surfaces:

(a)Control joints in ceramic tile flooring: Elastomeric joint sealant ES-S3, match grout color.

(4)Interior perimeter joints between food equipment cases and between surfaces indicated and food equipment cases: Foam compression seals.

(5)Joint-sealant applications not indicated will be selected by the Contracting Officer from elastomeric products indicated in Part 2.

1.1.2.Related Sections

  1. Division2 Section "Pavement Joint Sealants" for sealing joints in exterior pavements, walkways, and curbing.
  2. Division3 Section "Cast-In-Place Concrete" for filling joints in interior floor slabs.
  3. Division4 Section "Unit Masonry Assemblies" for masonry control and expansion joint fillers and gaskets.
  4. Division7 Section "Exterior Insulation and Finish Systems" for sealing joints in EIFS with elastomeric joint sealants.
  5. Division8 Section "Glazing" for glazing sealants.
  6. Division9 Section "Gypsum Board Assemblies" for sealing perimeter joints of gypsum board partitions to reduce sound transmission.

1.2PRECONSTRUCTION TESTING

1.2.1.Preconstruction Compatibility and Adhesion Testing

  1. Submit to joint-sealant manufacturers, for testing indicated below, samples of materials that will contact or affect joint sealants.

(1)Use ASTMC1087 to determine whether priming and other specific joint preparation techniques are required to obtain rapid, optimum adhesion of joint sealants to joint substrates.

(2)Submit not fewer than eight pieces of each type of material, including joint substrates, shims, joint-sealant backings, secondary seals, and miscellaneous materials.

(3)Schedule sufficient time for testing and analyzing results to prevent delaying the Work.

(4)For materials failing tests, obtain joint-sealant manufacturer's written instructions for corrective measures including use of specially formulated primers.

1.2.2.Testing will not be required if joint-sealant manufacturers submit joint preparation data that are based on previous testing of current sealant products for adhesion to, and compatibility with, joint substrates and other materials matching those submitted.

1.2.3.Preconstruction Field-Adhesion Testing

  1. Before installing elastomeric sealants, field test their adhesion to Project joint substrates as follows:

(1)Locate test joints where indicated on Project or, if not indicated, as directed by Contracting Officer.

(2)Conduct field tests for each application indicated below:

(a)Each kind of elastomeric sealant and joint substrate indicated.

(3)Notify Contracting Officer seven days in advance of dates and times when test joints will be erected.

(4)Arrange for tests to take place with joint-sealant manufacturer's technical representative present.

(a)Test Method: Test joint sealants according to MethodA, Field-Applied Sealant Joint Hand Pull Tab, in AppendixX1 in ASTMC1193.

(b)For joints with dissimilar substrates, verify adhesion to each substrate separately; extend cut along one side, verifying adhesion to opposite side. Repeat procedure for opposite side.

(5)Report whether sealant failed to adhere to joint substrates or tore cohesively. Include data on pull distance used to test each kind of product and joint substrate. For sealants that fail adhesively, retest until satisfactory adhesion is obtained.

(6)Evaluation of Preconstruction Field-Adhesion-Test Results: Sealants not evidencing adhesive failure from testing, in absence of other indications of noncompliance with requirements, will be considered satisfactory. Do not use sealants that fail to adhere to joint substrates during testing.

1.3SUBMITTALS

1.3.1.Product Data

  1. For each joint-sealant product indicated.

1.3.2.Samples for Verification

  1. For each kind and color of joint sealant required, provide Samples with joint sealants in 1/2-inch- wide joints formed between two 6-inch- long strips of material matching the appearance of exposed surfaces adjacent to joint sealants.

1.3.3.Preconstruction Compatibility and Adhesion Test Reports

  1. From sealant manufacturer, indicating the following:

(1)Materials forming joint substrates and joint-sealant backings have been tested for compatibility and adhesion with joint sealants.

(2)Interpretation of test results and written recommendations for primers and substrate preparation needed for adhesion.

1.3.4.Product Test Reports

  1. Based on evaluation of comprehensive tests performed by a qualified testing agency, indicating that sealants comply with requirements.

1.3.5.Preconstruction Field-Adhesion Test Reports

  1. Indicate which sealants and joint preparation methods resulted in optimum adhesion to joint substrates based on testing specified in "Preconstruction Testing" Article.

1.3.6.Sealant, Waterproofing, and Restoration Institute (SWRI) Validation Certificate

  1. For each sealant specified to be validated by SWRI's Sealant Validation Program. .

1.3.7.Sustainable Design Submittal:

  1. Product Data

(1)For sealants and sealant primers used inside the weatherproofing system, including printed statement of VOC content. (CreditEQ4.1)

1.3.8.Submittal List

ReferenceSubmittal ItemQuantityAction

1.3.1Product DataXR

1.3.2Samples for VerificationXR

1.3.3Preconstruction Compatibility and Adhesion Test ReportsXI

1.3.4Product Test ReportsXI

1.3.5Preconstruction Field-Adhesion Test ReportsXI

1.3.6SWRI Validation CertificateXI

1.3.7Sustainable Design SubmittalXI

XSubmit quantity specified in Division 1 Section “Administrative Requirements.”

RReview each submittal, mark to indicate action taken, and return.

ISubmittal is for information or record purposes only. No action will be taken.

1.4QUALITY ASSURANCE

1.4.1.Source Limitations

  1. Obtain each kind of joint sealant through one source from a single manufacturer.

1.4.2.Product Testing

  1. Test joint sealants using a qualified testing agency.

(1)Testing Agency Qualifications: An independent testing agency qualified according to ASTMC1021 to conduct the testing indicated.

(2)Test elastomeric joint sealants according to SWRI's Sealant Validation Program for compliance with requirements specified by reference to ASTMC920, for adhesion and cohesion under cyclic movement, adhesion-in-peel, and indentation hardness.

1.5PROJECT CONDITIONS

1.5.1.General

  1. Do not proceed with installation of joint sealants under the following conditions:

(1)When ambient and substrate temperature conditions are outside limits permitted by joint-sealant manufacturer.

(2)When joint substrates are wet.

(3)Where joint widths are less than those allowed by joint-sealant manufacturer for applications indicated.

(4)Where Contaminants capable of interfering with adhesion have not yet been removed from joint substrates.

PART 2 - PRODUCTS

2.1MANUFACTURERS

BasisofDesign Products: To establish the significant qualities related to type, function, dimension, inservice performance, physical properties, appearance, and other characteristics for purposes of evaluating comparable products of other manufacturers, a specific manufacturer's product is named and accompanied by the words "basis of design," including make or model number or other designation. Subject to compliance with requirements, provide either the named products or equal products.

2.2MATERIALS, GENERAL

2.2.1.Compatibility

  1. Provide joint sealants, backings, and other related materials that are compatible with one another and with joint substrates under conditions of service and application, as demonstrated by sealant manufacturer, based on testing and field experience.

2.2.2.VOC Content of Interior Sealants

  1. Provide sealants and sealant primers for use inside the weatherproofing system that comply with the following limits for VOC content when calculated according to 40CFR59, Part 59, SubpartD (EPA Method24):

(1)Architectural Sealants: 250 g/L.

(2)Sealant Primers for Nonporous Substrates: 250 g/L.

(3)Sealant Primers for Porous Substrates: 775 g/L

2.3ELASTOMERIC JOINT SEALANTS

2.3.1.Elastomeric Sealants

  1. Comply with ASTMC920 and other requirements indicated for each liquid-applied chemically curing sealant specified, including those referencing ASTMC920 classifications for type, grade, class, and uses related to exposure and joint substrates.

2.3.2.Stain-Test-Response Characteristics

  1. Where elastomeric sealants are specified to be nonstaining to porous substrates, provide products that have undergone testing according to ASTMC1248 and have not stained porous joint substrates indicated for Project.

2.3.3.Suitability for Contact with Food

  1. Where elastomeric sealants are indicated for joints that will come in repeated contact with food, provide products that comply with 21CFR177.2600.

2.3.4.ES-S1 Single-Component Nonsag Neutral-Curing Surface Modified Silicone Sealant (Low dirt pick-up).

  1. Basis-of-Design Product: Dow Corning Corporation; 756SMS..
  2. Type and Grade: S (single component) and NS (nonsag).
  3. Class: 50.
  4. Use Related to Exposure: NT (nontraffic).

2.3.5.ES-S2 Single-Component Pourable Neutral-Curing Silicone Sealant:

  1. Basis-of-Design Product: Dow Corning Corporation; 890-SL.
  2. Type and Grade: S (single component) and P (pourable).
  3. Class: 100/50.
  4. Use Related to Exposure: T (traffic).

2.3.6.ES-S3 Single-Component Neutral-Curing Silicone Sealant:

  1. Basis-of-Design Product: Dow Corning Corporation; 790.
  2. Type and Grade: S (single component) and NS (nonsag).
  3. Class: 100/50.
  4. Use Related to Exposure: T (traffic).
  5. Stain-Test-Response Characteristics: Nonstaining to porous substrates.

2.3.7.ES-S4 Single-Component Neutral-Curing Silicone Sealant:

  1. Basis-of-Design Product: Dow Corning Corporation; 795.
  2. Type and Grade: S (single component) and NS (nonsag).
  3. Class: 50.
  4. Use Related to Exposure: NT (nontraffic).
  5. Stain-Test-Response Characteristics: Nonstaining to porous substrates.

2.3.8.ES-S5 Single-Component Mildew-Resistant Acid-Curing Silicone Sealant:

  1. Basis-of-Design Product: Dow Corning Corporation; 786Mildew Resistant.
  2. Type and Grade: S (single component) and NS (nonsag).
  3. Class: 25.
  4. Use Related to Exposure: NT (nontraffic).

2.3.9.ES-U1 Single-Component, Self-Leveling, Urethane Joint Sealant:

  1. Basis-of-Design Product: Tremco Incorporated; Vulkem45.
  2. Type and Grade: S (single component) and P (pourable).
  3. Class: 25.
  4. Use Related to Exposure: T (traffic).

2.4LATEX JOINT SEALANTS

2.4.1.Acrylic Latex Or Siliconized Acrylic Latex Sealant

  1. Comply with ASTMC834, TypeOP, GradeNF.

2.4.2.Basis-of-Design Products:

  1. Bostik Findley; Chem-Calk600.
  2. Pecora Corporation; AC-20+.
  3. Schnee-Morehead, Inc.; SM8200.
  4. BASF Building Systems; Sonolac.
  5. Tremco; Tremflex834.

2.5JOINT-SEALANT BACKING

2.5.1.General

  1. Provide sealant backings of material that are nonstaining; are compatible with joint substrates, sealants, primers, and other joint fillers; and are approved for applications indicated by sealant manufacturer based on field experience and laboratory testing.

2.5.2.Cylindrical Sealant Backings

  1. ASTMC1330, TypeC (closed-cell material with a surface skin), O (open-cell material), B (bicellular material with a surface skin),or any of the preceding types, as approved in writing by joint-sealant manufacturer for joint application indicated, and of size and density to control sealant depth and otherwise contribute to producing optimum sealant performance:

2.5.3.Bond-Breaker Tape

  1. Polyethylene tape or other plastic tape recommended by sealant manufacturer for preventing sealant from adhering to rigid, inflexible joint-filler materials or joint surfaces at back of joint. Provide self-adhesive tape where applicable.

2.6FOAM COMPRESSION SEALS

  1. Manufacturer's standard preformed continuous foam compression seals to fill voids between refrigerated display cases and adjacent wall surfaces.
  2. Basis-of-design product: Armacell LLC, AP/Armaflex, 48-inch wide by 18-foot long by 2-inch thick rolls.

(1)Meets requirements for resistance to mold growth (UL181), fungi (ASTM G 21 / C 1338), and bacteria (ASTM G 22).

(2)Properties: Permanently elastic, mildew resistant, nonmigratory, nonstaining, and compatible with joint substrates and other joint sealants.

(3)Flame spread and smoke developed index: 25/50, ASTM E 84.

(4)Density: 3.0 to 6.0 lb/cu. ft.

2.7MISCELLANEOUS MATERIALS

2.7.1.Primer

  1. Material recommended by joint-sealant manufacturer where required for adhesion of sealant to joint substrates indicated, as determined from preconstruction joint-sealant-substrate tests and field tests.

2.7.2.Cleaners for Nonporous Surfaces

  1. Chemical cleaners acceptable to manufacturers of sealants and sealant backing materials, free of oily residues or other substances capable of staining or harming joint substrates and adjacent nonporous surfaces in any way, and formulated to promote optimum adhesion of sealants to joint substrates.

2.7.3.Masking Tape

  1. Nonstaining, nonabsorbent material compatible with joint sealants and surfaces adjacent to joints.

PART 3 - EXECUTION

3.1EXAMINATION

Examine joints indicated to receive joint sealants, with Installer present, for compliance with requirements for joint configuration, installation tolerances, and other conditions affecting joint-sealant performance. Proceed with installation only after unsatisfactory conditions have been corrected.

3.2PREPARATION

3.2.1.Surface Cleaning of Joints

  1. Clean out joints immediately before installing joint sealants to comply with joint-sealant manufacturer's written instructions and the following requirements:

(1)Remove all foreign material from joint substrates that could interfere with adhesion of joint sealant, including dust, paints (except for permanent, protective coatings tested and approved for sealant adhesion and compatibility by sealant manufacturer), old joint sealants, oil, grease, waterproofing, water repellents, water, surface dirt, and frost.

(2)Clean porous joint substrate surfaces by brushing, grinding, mechanical abrading, or a combination of these methods to produce a clean, sound substrate capable of developing optimum bond with joint sealants. Remove loose particles remaining after cleaning operations above by vacuuming or blowing out joints with oil-free compressed air. Porous joint substrates include the following: