07900.pdf

112-006 07900-1

DIVISION 7 – THERMAL AND MOISTURE PROTECTION 1

SECTION 07900 3

JOINT SEALERS 4

A. GENERAL 6

RELATED WORK ELSEWHERE 8

Joint sealers in mechanical work, including caulking around 10 plumbing fixtures Division 15 11

Joint sealers in electrical work Division 16 12

SUBMITTALS 14

Color samples shall be submitted in accordance with Section 1B, Shop Drawings/Submittals. Samples shall be 16 strips of actual caulking. Paper samples will not be acceptable. 17

GENERAL PERFORMANCE 19

Joint sealers, except as otherwise indicated, are required to establish and maintain airtight and waterproof 21 continuous seals on a permanent basis, within recognized limitations of wear and aging as indicated for each 22 application. Failures of installed sealers to comply with this requirement will be recognized as failures of materials 23 and workmanship. 24

JOB CONDITIONS 26

Sealants shall be installed on dry days preferably with temperatures between 40 deg. F and 55 def. F, but in no 28 case shall sealants be installed when temperatures are below 40 deg. F or above 90 deg. F. 29 Special care shall be exercised to prevent damage to adjacent work during installation of sealants. 31 Sequencing 33

1. Install sealant adjacent to painted surfaces before adjacent surfaces receive their final coat of paint. 34

2. Caulking shall not begin until all samples have been approved. 35

B. PRODUCTS 37

SEALANTS 39

Thermosetting building sealant (caulking) shall be one or two-part polyurethane sealants and shall be one of the 41 following types and manufacturers (or approved equal): 42

Sonolastic NP-1 Sonneborn 43 Dynatrol II Pecora Corporation 44 Dymeric 240 Tremco Manufacturing Co. 45

Provide the sealant manufacturer's recommended type of joint primer for joint surfaces to be primed. Verify with 47 the sealant manufacturers which materials require priming for each of the sealants used. 48 Backer rod shall be a closed-cell polyethylene rod, of a diameter 1/8" greater than the joint width up to 3/4" 50 diameter and 1" diameter for 3/4" wide joints, and of the following types and manufacture (or approved equal): 51 Sonofoam Backer-Rod Sonneborn 52

Grace Foam Joint Filler W. R. Grace & Company 53 Bond breaker, where required to break the bond between sealant and the back-up material or joint filler, shall be a 55 tape material recommended by the sealant manufacturer, or shall be polyethylene film. 56

112-006 07900-2

C. EXECUTION 1

INSPECTION 3

Installer must examine substrates (joint surfaces) and conditions under which joint sealer work is to be performed, 5 and must notify Contractor in writing of unsatisfactory conditions. Do not proceed with joint sealer work until 6 unsatisfactory conditions have been corrected in a manner acceptable to installer. 7

PREPARATION 9

Clean down joint surfaces using oil-free solvent for metal, glass, and other non-porous surfaces, and by wire 11 brushing concrete and masonry surfaces. Surfaces to receive sealant shall be sound, clean and dry, and free of 12 frost, laitance, curing compounds, waterproofing compounds, mastic compounds, corrosion, mill scale, rust, oil, 13 tar, wax, paint, mastic, and similar contaminates. 14 Sandblast concrete in contact with form release agents. 16 Prime concrete, masonry, wood and similar porous surfaces. Brush out excess material to insure a uniform film 18 over the joint face. Allow primer to dry out before applying sealant. 19 Mask adjacent areas as necessary to obtain a neat sealant line. 21

INSTALLATION 23

Comply with the manufacturer's printed instructions except where more stringent requirements are shown or 25 specified, and except where manufacturer's technical representative directs otherwise. 26 Mix two-part sealants by mixing the activator with the resin uniformly and thoroughly, in the proportions supplied to 28 meet the recommendations of the sealant manufacturer. Sealant shall be mixed in a mechanical mixer, except 29 very small amounts may be hand mixed with a trowel. 30 Install backer rod with a blunt rod or plain faced roller. Recess into joint to meet the requirements of the sealant 32 manufacturer's recommendations for joint width and depth ratio. Do not puncture, fold, twist, or crease backer rod. 33 Install bond breaker where sealant would otherwise bond to backer rod or joint filler. 36 Do not allow sealants or compounds to overflow from confines of joints, to spill onto adjoining work, or to migrate 38 into voids of exposed finishes. Clean adjoining surfaces by whatever means may be necessary to eliminate 39 evidence of spillage. 40 Install sealants in uniform, continuous ribbons without gaps or air pockets, with complete "wetting" of joint bond 42 surfaces equally on opposite sides. Except as otherwise indicated, fill sealant rabbet to a slightly concave surface 43 slightly below adjoining surfaces. 44 Where horizontal joints are between the horizontal surface and vertical surface, fill joint to form a slight cove, so 46 that joint will not trap moisture and dirt. 47 Apply thermo-setting sealants by holding the gun nozzle at an angle of about 45 degrees and move steadily along 49 the joint so that a uniform bead is applied without dragging, tearing, or leaving unfilled spaces. Push the bead 50 rather than draw it with the gun leading. Fill joints in vertical surfaces level with adjacent surfaces and tool within 51 ten minutes of application with one continuous stroke to insure intimate contact with the joint surfaces, to remove 52 any trapped air or voids, to consolidate material, and to provide a neat, uniform, appearance. Fill joints in 53 horizontal surfaces holding the top surface of the sealant slightly below the adjacent surfaces. 54 Install self-leveling sealants to a depth equal to 75 percent of joint width but neither more than 5/8-inch deep or 56 less than 3/8-inch deep as recommended by sealant manufacturer. Pour sealant into joints and fill to within 1/16-57 inch of adjacent surfaces, exercising care not to spill sealant on such surfaces. Refill any areas where sealant 58 seeps out of joint through the expansion joint filler before sealant sets up. 59

112-006 07900-3

CLEANING AND PROTECTION 1

Remove masking immediately after application and tooling operations are complete. Clean excess or spilled 3 sealant from non-porous surfaces with solvent before curing. Clean excess or spilled sealant from porous 4 surfaces with abrasive or mechanical means after curing. 5 Protect sealant where bituminous material is to be applied over thermosetting joint sealant with vinyl or 7 polyethylene sheet material. 8 Cure sealants in compliance with manufacturer's written instructions and recommendations, to obtain high early 10 bond strength, internal cohesive strength and surface durability. Advise Contractor of procedures required for cure 11 and protection of joint sealers during construction period, so that they will be without deterioration or damage 12 (other than normal wear and weathering) at time of Substantial Completion. Replace or restore sealants which are 13 damaged or deteriorated during construction period. 14

SCHEDULE OF APPLICATION 16

Apply thermosetting building sealant at the following locations: 18

At vertical jambs of all interior window and door frames 19 At all exposed isolation, expansion, and control joints 20 At miscellaneous locations where caulking is shown on the Drawings 21

SCHEDULE OF SPECIAL SEALANT COLORS 23

Special sealant colors shall match Tremco colors as follows: 25

At miscellaneous locations shown on the Drawings Standard color to most closely 26 match adjacent colors 27