Spec. Standard: 08/31/ Revision: 09/28/07

Transcription

1 SECTION SEALANTS PART 1 - GENERAL 1.01 SCOPE: The required applications include, but are not necessarily limited to, the following: A. Flashing and Joints B. Partition and Ceiling Joints C. Equipment and Isolation Joints D. Gasketing for Assembly of Components 1.02 SUBMITTALS: A. Manufacturer's Data, Joint Sealers: Submit manufacturer's specifications, recommendations and installation instructions for each type of material required. Include manufacturer's published data, or letter of certification, or certified test laboratory report indicating that each material complies with the requirements and is intended generally for the applications shown. B. Guarantee, Joint Sealers: Submit written guarantee agreeing to repair or replace joint sealers which fail to perform as airtight and watertight joints, or fail in joint adhesion, cohesion, abrasion resistance, stain resistance, or general durability, or appear to deteriorate in any other manner not clearly specified by submitted manufacturer's data as an inherent quality of the material for the exposure indicated. Provide guarantee signed by the CONTRACTOR. Guarantee period shall be two (2) years JOB CONDITIONS: A. The CONTRACTOR must examine the joint surfaces and backing, and their anchorage to the structure, and the conditions under which the joint sealer work is to be performed. Do not proceed with the joint sealer work until unsatisfactory conditions have been corrected. B. Do not proceed with installation of sealants under adverse weather conditions, or when temperatures are below or above manufacturer's recommended limitations for installation. Proceed with the work only when forecasted weather conditions are favorable for proper cure and development of high early bond strength. Wherever joint width is affected by ambient temperature variations, install elastomeric sealants only when temperatures are in the lower third of manufacturer's recommended installation temperature range WARRANTY: A. The MANUFACTURER shall warrant the EQUIPMENT, MATERIALS and PRODUCTS specified in this section against defective materials and workmanship with the MANUFACTURER S standard warranty, but for no less than one year from the date of Substantial Completion, and as described in Article 13 of Section General Terms and Conditions. B. The CONTRACTOR shall warrant the WORK against defects for one year from the date of Substantial Completion and as described in Article 13 of Section General Terms and Conditions. PART 2 - PRODUCTS 2.01 MATERIALS, GENERAL: A. Colors: For exposed materials provide color as indicated or, if not indicated, as selected by the DISTRICT from manufacturer's standard colors. For concealed materials, provide the natural color that has the best overall performance characteristics. Spec. Standard: 08/31/ Revision: 09/28/07

2 B. Hardness: As recommended by manufacturer for application shown, unless otherwise indicated. C. Modulus of Elasticity: Provide the lowest available modulus of elasticity which is consistent with exposure to weathering, indentation, vandalism, abrasion, support of loading, and other requirements. D. Compatibility: Before purchase of each required material, confirm its compatibility with each other material it will be exposed to in the joint system. E. Size and Shape: As shown or, if not shown, as recommended by the manufacturer for the type and condition of joint, and for the indicated joint performance or movement. F. Grade of Sealant: For each application, provide the grade of sealant (non-sag, self-leveling, no-track, knife grade, preformed) as recommended by the manufacturer for the particular condition of installation (location, joint shape, ambient temperature, and similar conditions) to achieve the best possible overall performance. Grades specified herein are for normal condition of installation. G. One-Component Polysulfide Sealant: Polysulfide based, one-part elastomeric sealant, complying with FS TT-S-00230, Class A, Type II (non-sag), unless Type I recommended by manufacturer for the application shown. H. Two-Component Polysulfide Sealant: Polysulfide based, two-part elastomeric sealant NON-ELASTOMERIC SEALANTS: A. One-Component Acrylic Sealant: Acrylic terpolymer, solvent-based, one-part, thermoplastic sealant compound; solids not less than 95 percent acrylic; complying with FS TT-S-00230, Class B, Type II, recommended by manufacturer for general use as an exposed building construction sealant. B. Acrylic-Latex Sealant: Latex-rubber-modified, acrylic-emulsion-polymer sealant compound permanently flexible, non-staining, and non-bleeding, recommended by manufacturer for protected exterior exposure CAULKING COMPOUNDS: Synthetic Resin Caulking Compounds - Oil-based caulking compound complying with FS TT-C-598, except compounded only with special synthetic resins, non-staining, nonbleeding, paintable JOINT FILLERS: Provide type as recommended by manufacturer for use with joint type and sealant, nonstaining, resilient MISCELLANEOUS MATERIALS: A. Oakum Joint Filler: Provide untreated hemp or jute fiber rope, free of oil, tar, and other compounds which might stain surfaces, contaminate joint walls, or not be compatible with sealants. B. Joint Primer/Sealer: Provide the type of joint primer/sealer recommended by the sealant manufacturer for the joint surfaces to be primed or sealed. C. Bond Breaker Tape: Polyethylene tape or other plastic tape as recommended by the sealant manufacturer to be applied to sealant-contact surfaces where bond to the substrate or joint filler must be avoided for proper performance of sealant. Provide self-adhesive tape wherever applicable. D. Sealant Backer Rod: Compressible rod stock of polyethylene foam, polyethylene jacketed polyurethane foam, butyl rubber foam, neoprene foam, or other flexible, permanent, durable nonabsorptive material as recommended for compatibility with sealant by the sealant manufacturer. Spec. Standard: 08/31/ Revision: 09/28/07

3 PART 3 - EXECUTION 3.01 MANUFACTURER'S INSTRUCTIONS: Comply with manufacturer's printed instructions except where more stringent requirements are shown or specified and except where manufacturer's technical representative directs otherwise JOINT PREPARATION: Clean joint surfaces immediately before installation of sealant or caulking compound. Remove dirt, insecure coatings, moisture and other substances that would interfere with bond of sealant or caulking compound. Etch concrete and masonry joint surfaces as recommended by sealant manufacturer. Roughen vitreous or glazed joint surfaces as recommended by sealant manufacturer. Prime or seal the joint surfaces wherever shown or recommended by the sealant manufacturer. Do not allow primer/sealer to spill or migrate onto adjoining surfaces INSTALLATION: A. Set joint filler units at proper depth or position in the joint to coordinate with other work, including the installation of bond breakers, backer rods and sealants. Do not leave voids or gaps between the ends of joint filler units. B. Install sealant backer rod for liquid elastomeric sealants, except where shown to be omitted or recommended to be omitted by sealant manufacturer for the application shown. C. Install bond breaker tape wherever shown and wherever required by manufacturer's recommendations to ensure that elastomeric sealants will perform properly. D. Employ only proven installation techniques, which will ensure that sealants will be deposited in uniform, continuous ribbons without gaps or air pockets with complete "wetting" of the joint bond surfaces equally on opposite sides. Except as otherwise indicated, fill sealant rabbet to a slightly concave surface, slightly below adjoining surfaces. Where horizontal joints are between a horizontal surface and vertical surface, fill joint to form a slight cove so that joint will not trap moisture and dirt. E. Install sealant to depths shown or, if not shown, as recommended by the sealant manufacturer but within the following general limitations, measured at the center (thin) section of the bead: 1. For sidewalks, pavements, and similar joints sealed with elastomeric sealants and subject to traffic and other abrasion and indentation exposures, fill joints to a depth equal to 75 percent of joint width, but neither more than 5/8 inch deep nor less than 3/8 inch deep. 2. For normal moving joints sealed with elastomeric sealants but not subject to traffic, fill joints to a depth equal to 50 percent of joint width, but neither more than 1/2 inch deep nor less than 1/4 inch deep. 3. For joints sealed with non-elastomeric sealants and caulking compounds, fill joints to a depth in the range of 75 percent to 125 percent of joint width. F. Do not allow sealants or compounds to overflow or spill onto adjoining surfaces, or to migrate into the voids of adjoining surfaces. Clean the adjoining surfaces by whatever means may be necessary to eliminate evidence of spillage CURE AND PROTECTION: Cure sealants and caulking compounds in compliance with manufacturer's instructions and recommendations to obtain high early bond strength, internal cohesive strength and surface durability. Protect joint sealers during the construction period so that they will be without deterioration or damage at the time of the DISTRICT's acceptance. END OF SECTION Spec. Standard: 08/31/ Revision: 09/28/07

4 SECTION JOINT SEALANTS PART 1 - GENERAL 1.01 SUMMARY: This Section includes sealants and related materials for application in the joint locations specified in PART REFERENCES: A. Applicable Standards: 1.03 SUBMITTALS: 1. American Society for Testing and Materials (ASTM): a. C920 - Elastomeric Joint Sealants. b. C962 - Guides for Use of Elastomeric Joint Sealants. A. Submit as specified in DIVISION 1. B. Includes, but not limited to, the following for each type of sealant or associated material required. 1. Product data and specifications including instructions for joint preparation and sealer application. 2. Color charts. 3. Samples for initial selection purposes: Submit samples consisting of strips of actual product showing full range of colors available, for each type of sealant exposed to view. C. Certificates: Review the joint design and specifications and verify that the joint system is appropriate for its location and that sealant materials comply with specifications QUALITY ASSURANCE: A. Manufacturer of sealants shall have a minimum of 5 years of successful experience in the production of types of sealants required. B. Sealant installer shall be certified by the sealant manufacturer as having the necessary experience and equipment to install the materials properly. C. Obtain joint sealant materials from a single manufacturer for each different product required. D. Preconstruction Compatibility and Adhesion Testing: Submit samples of all materials that will contact or affect joint sealers to joint sealer manufacturers for compatibility and adhesion testing, as indicted below: 1. Use test methods standard with manufacturer to determine if priming and other specific joint preparation techniques are required to obtain rapid, optimum adhesion of joint sealers to joint substrates. 2. Perform tests under normal environmental conditions that will exist during actual installation. 3. Investigate materials failing compatibility or adhesion tests and obtain joint sealer manufacturer's written recommendations for corrective measures, including us of specially formulated primers DELIVERY, STORAGE AND HANDLING: Spec. Standard: 08/31/ Revision: 09/28/11

5 A. Deliver all materials in original sealed containers or bundles with labels and inscriptions legible and intact, and informing about manufacturer, product name and designation, color, expiration period for use, pot life, curing time, and mixing instructions for multi-component materials. B. Store all materials in areas suitable to prevent deterioration or damage due to moisture, high or low temperatures, contaminants, or other causes PROJECT CONDITIONS: A. Environmental Conditions: Do not proceed with installation of joint sealers under the following conditions: 1. When ambient and substrate temperature conditions are outside the limits permitted by joint sealer manufacturer or below 40 degrees F. (4.4 degrees C.). 2. When joint substrates are wet due to rain, frost, condensation, or other causes. B. Joint Width Conditions: Do not proceed with installation of joint sealers where joint widths are less than allowed by joint sealer manufacturer for application indicated. C. Joint Substrate Conditions: Do not proceed with installation of joint sealers until contaminants capable of interfering with their adhesion are removed from joint substrates. D. Proceed with application only when forecasted weather conditions is favorable for proper cure and development of bond strength WARRANTY: A. The MANUFACTURER shall warrant the EQUIPMENT, MATERIALS and PRODUCTS specified in this section against defective materials and workmanship with the MANUFACTURER S standard warranty, but for no less than one year from the date of Substantial Completion, and as described in Article 13 of Section General Terms and Conditions. B. The CONTRACTOR shall warrant the WORK against defects for one year from the date of Substantial Completion and as described in Article 13 of Section General Terms and Conditions. PART 2 - PRODUCTS 2.01 ACCEPTABLE MANUFACTURERS: A. Manufacturer listed under each type of material is to establish minimum quality and specific type. Equivalent products of manufacturers listed below will be acceptable subject to suitability for intended condition GENERAL: 1. Sealants and Caulking: a. Bostik Construction Products Div. b. Pecora Corporation c. Sonneborn Building Products d. Tremco Manufacturing Company e. W. R. Meadows, Inc. A. Before purchase of each specified sealant, investigate its compatibility with the joint surfaces, joint fillers, and other materials in the joint system. Select materials for compatibility with joint surfaces Spec. Standard: 08/31/ Revision: 09/28/11

6 and other indicated exposures, and except as otherwise indicated select modulus of elasticity and hardness or grade recommended by manufacturer for each application indicated. B. Provide colors as selected by the DISTRICT from manufacturer's standard colors ELASTOMERIC SEALANTS: A. Sealants conforming to equivalent Federal Specifications will be acceptable. 1. One-Component Urethane Sealant: (Use NT) a. Conform to ASTM C920, Type S, Grade NS, Class 25. Use classification as required by locations stated below. b. Manufacturer: Pecora Dynatrol I or Tremco Dymonic c. Use in the following locations: i. Exterior and interior joints around perimeter of doors and louver frames. ii. iii. iv. Thresholds 2.04 MISCELLANEOUS MATERIALS: Joints between gypsum board and precast concrete. Penetrations in exterior wall (both sides of wall) by piping, conduit and other service equipment. (Does not include generator exhaust opening). v. Perimeter of stainless steel plate at pipe wall sleeves. A. Joint Cleaner: Type as recommended by the sealant manufacturer, for the joint surfaces to be cleaned, which are not harmful to substrates and adjacent surfaces, and which do not leave oily residues or have detrimental effect on sealant adhesion or in-service performance. B. Joint Primer/Sealer: Type as recommended by the sealant manufacturer, for the joint surfaces to be primed or sealed FORM/SILICONE FIRE STOP SYSTEM: A. Fire Stop Foam: 1. Medium density, 2-part silicone elastomer with fire resistant properties to meet fire rating of wall, ceiling or floor as indicated. 2. Have ability to form in place and fill complex geometrics to provide a tight, compressive fit. 3. Have ability to be poked through and resealed easily when penetration is modified. B. Fire Stop Sealant: 1. One part silicone elastomeric sealant with fire resistant properties to meet fire rating of wall, ceiling or floor as indicated, and stop the passage of fire, smoke, fumes and water through the fire-rated penetration. 2. Little or no damming shall be required for small, simple penetrations. C. Damming and Priming Materials: 1. Include particleboard plywood or other suitable forming materials to contain foam and/or sealant. 2. Provide prime coat for sealant if recommended by manufacturers. D. Use in the following locations where indicted: Spec. Standard: 08/31/ Revision: 09/28/11

7 1. All penetrations in partition wall between Generator and Equipment Rooms. Seal from both sides. E. Manufacturer: PART 3 - EXECUTION 1. Dow Corning RTV Fire Stop Foam and Fire Stop Sealant. 2. General Electric TRV 7403 and Pensil JOINT SURFACE PREPARATION: A. Joint Cleaning: 1. Clean joint surfaces immediately before application of sealant. 2. Remove all foreign material from joint substrates which could interfere with adhesion of joint sealer, including dust, paints (except for permanent protective coatings tested and approved for sealant adhesion and compatibility by sealant manufacturer), oil, grease, waterproofing water repellents, water, surface dirt, and frost. 3. Clean concrete and similar porous joint surfaces by brushing, grinding, blast cleaning, mechanical abrading, or a combination of these methods to produce a clean, sound substrate capable of developing optimum bond with joint sealers. Remove loose particles remaining from above operations by vacuuming or blowing out joints with oil-free compressed air. 4. Remove laitance and form release agents from concrete. 5. Clean metal and other nonporous surfaces of chemical cleaners or other means that are not harmful to substrates or leave residues capable of interfering with adhesion of joint sealers. B. Joint Priming: Prime joint substrates as required by joint sealant manufacturer. Confine primers to areas of joint sealer bond; do not allow spillage or migration onto adjoining surfaces. C. Masking Tape: Use where required to prevent contact of sealant with adjoining surfaces which would otherwise be permanently stained or damaged by such contact or by cleaning methods required to remove sealant smears. Remove tape immediately after tooling without disturbing joint seal APPLICATION: A. Conform to sealant manufacturer's printed instructions except where more stringent requirements apply. 1. For elastomeric sealant installation, comply with ASTM C962 for use of joint sealants as applicable to materials, applications and conditions indicated. B. Install joint filler units at depth or position in joint to coordinate with other work and sealants. Do not leave voids or gaps between ends of joint fillers. Do not stretch, twist, puncture or tear joint fillers. Remove absorbent joint fillers that have become wet prior to sealant application and replace with dry materials. C. Install sealants by proven application techniques that result in sealants directly contacting and fully wetting joint substrates, completely filling recesses provided for each joint configuration and providing uniform, cross sectional shapes and depths relative to joint widths which allow optimum sealant movement capability. D. Install sealants to depths as recommended by sealant manufacturer, within the following limitations: 1. For normal moving joints sealed with elastomeric sealants, but not subject to traffic, fill joints to a depth equal to 50 percent of joint width, but neither more than 1/2-inch deep nor less than 1/4-inch deep. Spec. Standard: 08/31/ Revision: 09/28/11

8 E. Unless indicated otherwise, provide a slightly concave surface conforming to ASTM C962. F. Do not allow sealants or compounds to overflow from confines of joint or spill onto adjoining surfaces. Clean the adjoining surfaces to eliminate evidence of spillage, without damage to adjoining surfaces or finishes. G. Immediately after sealant installation and prior to time skimming or curing begins, tool nonsag sealants to form smooth uniform beads of configuration indicated, to eliminate air pockets and to ensure contact and adhesion of sealant with sides of joint. Do not use tooling agents that discolor sealants or adjacent surfaces or are not approved by sealant manufacturer. Remove excess sealant from surfaces adjacent to joint CURE AND PROTECTION: A. Cure sealants in compliance with manufacturer's printed instructions and recommendations, to obtain high early bond strength, internal cohesive strength and surface durability. Cure and protect sealants in a manner that will minimize increases in modulus of elasticity and other accelerated aging effects. Replace or restore sealants that are damaged or deteriorated during construction period. Repaired areas shall be indistinguishable from original work FIELD QUALITY CONTROL: A. After nominal cure of exterior joint sealants which are exposed to weather, test for water leaks as follows: 1. Flood joint exposure with water directed from a 3/4-inch garden hose and connected to water system with 25-psi minimum static water pressure. 2. Hold hose perpendicular to wall face, 2 feet-0 inch from joint, and move stream of water along joint at approximate rate of 20 feet per minute. B. Repair sealant installation at leaks or, if leakage is excessive, replace sealant installation as required. Do not perform repair or replacement work until joints are dry. END OF SECTION Spec. Standard: 08/31/ Revision: 09/28/11