JOINT SEALANTS

Joint sealants shop drawings have been made.

JOINT SEALANTS drafts

JOINT SEALANTS

REFERENCES

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

SUBMITTALS

Manufacturer's Data Catalog

Clearly mark data to identify material type to be provided. Submit complete descriptive data for:

a. Sealant

b. Primer

c. Backstop material

d. Sealant tape

Instructions

Before installation submit manufacturer's printed installation instructions including application instructions and precautions, shelf life, recommended cleaning solvents and curing time for the following:

a. Sealant

b. Primer

c. Backstop material

d. Sealant tape

ENVIRONMENTAL CONDITIONS

The ambient temperature shall be within the limits of 5 to 40 degrees Centigrade when sealant is applied.

DELIVERY AND STORAGE

Deliver materials to the job site in unopened manufacturer's external shipping containers, with brand names, date of manufacture, color and material designation clearly marked thereon. Elastomeric sealant containers shall be labeled to identify type, class, grade, and use. Carefully handle and store materials to prevent inclusion of foreign materials or subjection to sustained temperatures exceeding 40 degrees Centigrade or less than 5 degrees Centigrade.

Colors

Submit one sample of each color for each sealant and caulking type to verify that products match the colors indicated. Where colors are not indicated, submit not less than three different samples of manufacturer's standard colors for selection by the Contracting Officer. Painting of placed sealant is not allowed.

Sample Joints

Before caulking and sealant work is started, provide a sample of each type of finished joint where directed. The sample shall show the workmanship, bond, and color of caulking or sealant material. The workmanship, bond, and color of sealant or caulking work throughout the project shall match that of the approved sample joints.

Definitions and Abbreviations

Terms used in this specification are defined in UNI EN 26927.

a. Type S: Single-component

b. Type M: Multicomponent

c. Grade P: Pourable or self-leveling sealant for horizontal applications

d. Grade NS: Nonsag for vertical applications

e. Class 25: Withstands increase and decrease of at least 25 percent of joint width

f. Class 12.5: Withstands increase and decrease of at least 12.5 percent of joint width

g. Use T: Pedestrian and vehicular traffic areas such as walkways, plazas, decks, and parking garages

h. Use NT: Nontraffic areas, horizontal and vertical surfaces

i. Use M: Meets this specification when tested on mortar

j. Use G: Meets this specification when tested on glass

k. Use A: Meets this specification when tested on aluminum

l. Use O: Meets this specification when tested on substrates other than above. Specify substrate types in project specification.

SEALANT

Provide sealant that has been tested and found suitable for the substrates to which it will be applied.

Interior Sealant

Interior sealant shall be acrylic latex base compound. Joint location and sealant color shall be as follows:

LOCATION COLOR

a. Small voids between walls or partitions Match adjacent material and adjacent casework, shelving, door frames, built-in or surface-mounted equipment and fixtures, and similar items.

b. Perimeter of frames at doors, windows, and Match adjacent material access panels which adjoin exposed interior concrete surfaces.


c. Joints of interior concrete walls and As selected partitions which adjoin columns, pilasters, concrete walls, and exterior walls unless otherwise detailed.

d. Interior locations, not otherwise indicated As selected or specified, where small voids exist between materials specified to be painted such as any wall penetration of pipe, conduits, pipe sleeves.

e. Around the perimeter of all wall-mounted Match adjacent material and floor-mounted plumbing fixtures, shower stalls and intersecting surfaces of ceramic tile

Exterior Sealant

Shall be single component butyl rubber base sealing compound or multicomponent polyurethane sealing compound. Joint location and sealant color shall be as follows:

LOCATION COLOR

a. Joints and recesses formed where frames Match metal color and subsills of windows, doors, louvers adjoin concrete or metal frames. Use sealant at both exterior and interior surfaces of exterior wall penetrations.

b. Joints in wash surfaces of metal Match metal color counterflashing.

c. Expansion and Control joints. As selected

d. Voids or gaps occasioned by piping Match adjacent penetrations through wall and voids material where items pass penetrated through exterior walls.

e. Prefabricated concrete copings As selected and eaves

f. Metal-to-metal joints where sealant Match metal color is indicated or specified.

g. Joints between ends of gravel stops, Match metal color fascias, coping, and adjacent walls.

Vertical Joints

For joints (8 mm to 35 mm) in vertical surfaces, provide an elastic (low modulus of elasticity) polyurethane, Type S or M, Grade NS, Class 25, use NT.

Horizontal Joints

For joints in horizontal surfaces, provide an elastic (0.15 N/mm2 modulus of elasticity) polyurethane, Type S or M, Grade P, Class 25, use T.

Floor Joint Sealant

Shall be single component butyl rubber base sealing compound or multicomponent polyurethane sealing compound. Provide at locations as follows:

LOCATION COLOR

a. Seats of metal thresholds for exterior doors. As selected

b. Control joints in floors, slabs, Black ceramic tile and walkways.

BOND BREAKERS

Provide the type and consistency recommended by the sealant manufacturer for the particular application.

BACKSTOPS

Provide glass fiber roping or neoprene, butyl, polyurethane, or polyethylene foams free from oil or other staining elements as recommended by sealant manufacturer. Backstop material shall be compatible with sealant. Do not use oakum and other types of absorptive materials as backstops.

CLEANING SOLVENTS

Provide type(s) recommended by the sealant manufacturer (except for aluminum and bronze surfaces that will be in contact with sealant).

SEALANT TAPE

Provide butyl or rubber butyl type as recommended by the sealant manufacturer for the particular application.

SURFACE PREPARATION

Surfaces shall be clean, dry to the touch, and free from dirt frost, moisture, grease, oil, wax, lacquer, paint, and other foreign matter that would tend to destroy or impair adhesion. When resealing an existing joint, remove existing caulk or sealant prior to applying new sealant.

Steel Surfaces

Remove loose mill scale by sandblasting or, if sandblasting is impractical or would damage finish work, scraping and wire brushing. Remove protective coatings by sandblasting or using a residue-free solvent.

Aluminum or Bronze Surfaces

Remove temporary protective coatings from surfaces that will be in contact with sealant. When masking tape is used as a protective coating, remove tape and any residual adhesive just prior to sealant application. Use non-staining solvents recommended by the item manufacturer.

SEALANT PREPARATION

Do not add liquids, solvents, or powders to the sealant. Mix multicomponent elastomeric sealants in accordance with manufacturer's instructions.

 

b. Unacceptable Ratios: Where joints of acceptable width to depth ratios have not been provided, clean out joints to depths and grind or cut to shown above widths without damaging the adjoining work. Grinding shall not be required on metal surfaces.

Backstops

Install backstops dry and free of tears or holes. Tightly pack the back or bottom of joint cavities with backstop material to provide a joint of the depth specified. Install backstops in the following locations:

a. Where indicated.

b. Where backstop is not indicated but joint cavities exceed the acceptable maximum depths specified in paragraph entitled, "Joint Width-to-Depth Ratios".

Primer

Immediately prior to application of sealant, clean out loose particles from joints. Where recommended by sealant manufacturer, apply primer to joints in concrete masonry units, wood, and other porous surfaces in accordance with sealant manufacturer's instructions. Do not apply primer to exposed finish surfaces.

Bond Breaker

Provide bond breakers to the back or bottom of joint cavities, as recommended by the sealant manufacturer for each type of joint and sealant used, to prevent sealant from adhering to these surfaces. Carefully apply the bond breaker to avoid contamination of adjoining surfaces or breaking bond with surfaces other than those covered by the bond breaker.

Sealants

Provide a sealant compatible with the material(s) to which it is applied. Do not use a sealant that has exceeded shelf life or has jelled and cannot be discharged in a continuous flow from the gun. Apply the sealant in accordance with the manufacturer's instruction with a gun having a nozzle that fits the joint width. Force sealant into joints to fill the joints solidly without air pockets. Sealant shall be tooled after application to ensure adhesion. Sealant shall be uniformly smooth and free of wrinkles. Upon completion of sealant application, roughen partially filled or unfilled joints, apply sealant, and tool smooth as specified.

Sealant Tape

Apply in accordance with sealant manufacturer's instructions.

PROTECTION AND CLEANING

Protection

Protect areas adjacent to joints form sealant smears. Masking tape may be used for this purpose if removed 50 to 10 minutes after the joint is filled.

Final Cleaning

Upon completion of sealant application, remove excess sealants and all remaining smears and stains and leave the work in a clean and neat condition.

a. Concrete and Other Porous Surfaces: Immediately scrape off fresh sealant that has been smeared on concrete and rub clean with a solvent as recommended by the sealant manufacturer. Allow excess sealant to cure for 24 hours then remove by wire brushing or sanding.

b. Metal and Other Non-Porous Surfaces: Remove excess sealant with a solvent-moistened cloth.