07900 - Calking and Sealants.doc

07900 - CAULKING AND SEALANTS

UHHZ 100240W, Paint IDIQ

PART 1 - GENERAL

1.01

WORK INCLUDED:

A.

Clean and prepare joint surfaces.

B.

Sealant and backing materials.

1.02

SUBMITTALS

Submit product data on all sealants, primers, and joint backing materials intended for use in the basic contract, see section 01300.

Not applicable.

C.

Submit two sets of sealant colors showing manufacturer's full range of color options for each type of sealant intended for use in this contract.

D.

Submit sealant manufacturer's surface preparation and installation instructions for each type of sealant intended for use in this contract.

1.03 WARRANTY

A. Provide 10 year Warranty.

Warranty: Replace sealants which fail because of loss of cohesion or adhesion, or do not cure.

1.04 APPLICABLE PUBLICATIONS: The following publications of the issues listed below, but referred to thereafter by basic designation only, form a part of this specification to the extent indicated by references thereto:

A. TT-S-00230C: Sealing Compound, Elastomeric Type, Single Component (for Calking, Sealing, and Glazing in Buildings and Other Structures), Rev C, 1970.

B. TT-S-001657: Sealing Compound, Single-Component, Butyl Rubber Based, Solvent Release Type (for Buildings and Other Types of Construction), 1970.

TT-S-00227E: Sealing Compound, Elastomeric Type, Multi-Component, (for Calking, Sealing, and Glazing in Buildings and Other Structures), Rev E, 1970.

ASTM D1056-85: Standard Specification for Flexible Cellular Materials - Sponge or Expanded Rubber.

E.

ASTM C834-91: Standard Specification for Latex Sealants.

1.05 ENVIRONMENTAL CONDITIONS: Follow sealant manufacturer's instructions for temperature and humidity limits when calking and sealants are applied.

1.06 DELIVERY AND STORAGE: Materials shall be delivered to the job in the manufacturers' original unopened containers. The containers shall include the following information on the label: supplier, name/type of material, formula or specification number, lot number, color, date of manufacture, mixing instructions, shelf life, and curing time when applicable at the standard conditions for laboratory tests. All materials shall be carefully handled and stored to prevent inclusion of foreign materials, or exposure to temperatures exceeding 90 degrees F. Calking compound or components outdated as indicated by shelf life shall not be used. (Sealant tape shall be handled and stored in a manner that will not deform the tape as received from the manufacturer.)

1.07 QUALITY ASSURANCE: Use only primers provided by the calking/sealant manufacturer.

PART 2 - MATERIALS

2.01 General: Calking or sealant shall be provided to replace deteriorated calking as identified by specific Delivery Order.

2.02 Sealant Types:

Type 1: Conforming to TT-S-00230C.

Type 2: Conforming to TT-S-001657.

Type 3: Conforming to TT-S-00227E

2.03 Sealant Formulation:

Intended Application: Each container brought to the jobsite with a different sealant formulation shall be marked for the intended use. For each intended use, the color shall be one of the manufacturer's standard colors as matching the adjacent surfaces as closely as possible. The sealant formulation shall conform to the requirements specified herein.

Components of each formula shall be used only with that formula. Intermixing of components of different formulas will not be permitted. Thinners or other additives shall not be used to modify the formula.

Mixing shall be in accordance with instructions provided by the manufacturer of the sealants. Mixing equipment shall be thoroughly cleaned before mixing each batch. For multi-component sealants, the entire portion of the accelerator or smaller unit shall be added to the entire portion of the compound or larger unit. The container shall have sufficient space at the top to allow for addition of the accelerator and for mixing.

PRIMERS: Primer for all calking products shall be as recommended by the calking manufacturer.

E.

BACKUP MATERIAL: Backup material shall be as recommended by sealant manufacturer, conforming to ASTM D1056.

F.

BOND PREVENTIVE MATERIALS: Bond-preventive materials shall be as recommended by the sealant manufacturer

PART 3 - EXECUTION

3.01 SURFACE PREPARATION: The surfaces of joints to be sealed shall be clean and dry. Oil, grease, dirt, chalk, particles of mortar, dust, loose rust, loose mill scale, and other foreign substances shall be removed from all joint surfaces to be sealed. Oil or grease shall be removed with solvent and surfaces shall be wiped with clean cloths.

Concrete and Masonry Surfaces: Remove laitance, efflorescence, and loose mortar from the joint cavity. Where surfaces have been treated with curing compounds, oil, or other such materials, remove these by sandblasting, wire brushing, scraping, or other suitable method. Request Government TCLP test for debris produced thereby to determine requirements for handling and disposal.

Steel surfaces to be in contact with sealant shall be sandblasted or, if sandblasting would not be practical or would damage adjacent finish work, the metal shall be scraped and wire brushed to remove loose mill scale. Protective coatings on steel surfaces shall be removed by sandblasting or by a solvent that leaves no residue. Request Government TCLP test for debris produced thereby to determine requirements for handling and disposal.

Aluminum surfaces of windows and door frames in contact with sealants shall be cleaned of temporary protective coatings. When masking tape is used for a protective cover, the tape and any residual adhesive shall be removed just prior to applying the sealant. Solvents used to remove protective coatings shall be as recommended by the manufacturer of the aluminum work and shall be nonstaining.

3.02

APPLICATION:

Primer shall be used on concrete masonry units, wood, or other porous surfaces in accordance with instructions furnished with the sealant. Primer shall be applied to the joint surfaces to be sealed according to manufacturer's instructions. Surfaces adjacent to joints shall not receive primer.

Apply bond breakers as required.

Install calking and sealants according to manufacturer's instructions.

3.03 CLEANING: The surfaces adjoining the calked and sealed joints shall be cleaned of smears and other soiling resulting from the calking and sealing application as work progresses.

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