07900.pdf

112-006 07900-1

SECTION 07900 1

JOINT SEALERS 2

A. GENERAL 4

SUBMITTALS 6

Color samples shall be submitted in accordance with Section 1B, Shop Drawings/Submittals. Samples shall be 8 strips of actual caulking. Paper samples will not be acceptable. 9

GENERAL PERFORMANCE 11

Joint sealers, except as otherwise indicated, are required to establish and maintain airtight and waterproof 13 continuous seals on a permanent basis, within recognized limitations of wear and aging as indicated for each 14 application. Failures of installed sealers to comply with this requirement will be recognized as failures of materials 15 and workmanship. 16

JOB CONDITIONS 18

Sealants shall be installed preferably with temperatures between 40 deg. F and 55 def. F, but in no case shall 20 sealants be installed when temperatures are below 40 deg. F or above 90 deg. F. 21 Special care shall be exercised to prevent damage to adjacent work during installation of sealants. 23 Sequencing 25

1. Install sealant adjacent to painted surfaces before adjacent surfaces receive their final coat of paint. 26

2. Caulking shall not begin until all samples have been approved. 27

B. PRODUCTS 29

SEALANTS 31

Thermosetting building sealant (caulking) shall be one or two-part polyurethane sealants and shall be one of the 33 following types and manufacturers (or approved equal): 34

Sonolastic NP-1 Sonneborn 35 Dynatrol II Pecora Corporation 36 Dymeric 240 Tremco Manufacturing Co. 37

Firestopping sealant for use at all penetrations through fire rated walls and at tops of such walls shall be CP25WB 39 Sealant, MPS-2 and MMP-4S putty and other accessories as manufactured by 3M Corp., or equivalent products 40 manufactured by Rectorseal Corporation, Bio Fireshield, Tremco, Specified Technologies, Johns Manville, or 41 United States Gypsum Co. Provide proper product at each appropriate location. 42 Acoustical sealant, for use at certain GWB partitions (as shown on Drawings) shall be one-component, pure 44 process Butyl Rubber Base sealant, aluminum gray color, and shall be Acoustical Sealant BA098 manufactured by 45 Pecora Corporation, or approved equal. 46 Provide the sealant manufacturer's recommended type of joint primer for joint surfaces to be primed. Verify with 48 the sealant manufacturers which materials require priming for each of the sealants used. 49 Backer rod shall be a closed-cell polyethylene rod, of a diameter 1/8" greater than the joint width up to 3/4" 51 diameter and 1" diameter for 3/4" wide joints, and of the following types and manufacture (or approved equal): 52 Sonofoam Backer-Rod Sonneborn 53

Grace Foam Joint Filler W. R. Grace & Company 54 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 Prime concrete, masonry, wood and similar porous surfaces. Brush out excess material to insure a uniform film 16 over the joint face. Allow primer to dry out before applying sealant. 17 Mask adjacent areas as necessary to obtain a neat sealant line. 19

INSTALLATION 21

Comply with the manufacturer's printed instructions except where more stringent requirements are shown or 23 specified, and except where manufacturer's technical representative directs otherwise. 24 Mix two-part sealants by mixing the activator with the resin uniformly and thoroughly, in the proportions supplied to 26 meet the recommendations of the sealant manufacturer. Sealant shall be mixed in a mechanical mixer, except 27 very small amounts may be hand mixed with a trowel. 28 Install backer rod with a blunt rod or plain faced roller. Recess into joint to meet the requirements of the sealant 30 manufacturer's recommendations for joint width and depth ratio. Do not puncture, fold, twist, or crease backer rod. 31 Install bond breaker where sealant would otherwise bond to backer rod or joint filler. 34 Do not allow sealants or compounds to overflow from confines of joints, to spill onto adjoining work, or to migrate 36 into voids of exposed finishes. Clean adjoining surfaces by whatever means may be necessary to eliminate 37 evidence of spillage. 38 Install sealants in uniform, continuous ribbons without gaps or air pockets, with complete "wetting" of joint bond 40 surfaces equally on opposite sides. Except as otherwise indicated, fill sealant rabbet to a slightly concave surface 41 slightly below adjoining surfaces. 42 Where horizontal joints are between the horizontal surface and vertical surface, fill joint to form a slight cove, so 44 that joint will not trap moisture and dirt. 45 Apply thermo-setting sealants by holding the gun nozzle at an angle of about 45 degrees and move steadily along 47 the joint so that a uniform bead is applied without dragging, tearing, or leaving unfilled spaces. Push the bead 48 rather than draw it with the gun leading. Fill joints in vertical surfaces level with adjacent surfaces and tool within 49 ten minutes of application with one continuous stroke to insure intimate contact with the joint surfaces, to remove 50 any trapped air or voids, to consolidate material, and to provide a neat uniform, appearance. Fill joints in 51 horizontal surfaces holding the top surface of the sealant slightly below the adjacent surfaces. 52 Install self-leveling sealants to a depth equal to 75 percent of joint width but neither more than 5/8-inch deep or 54 less than 3/8-inch deep as recommended by sealant manufacturer. Pour sealant into joints and fill to within 1/16-55 inch of adjacent surfaces, exercising care not to spill sealant on such surfaces. Refill any areas where sealant 56 seeps out of joint through the expansion joint filler before sealant sets up. 57

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 9 bond strength, internal cohesive strength and surface durability. Advise Contractor of procedures required for cure 10 and protection of joint sealers during construction period, so that they will be without deterioration or damage 11 (other than normal wear and weathering) at time of Substantial Completion. Replace or restore sealants which are 12 damaged or deteriorated during construction period. 13

SCHEDULE OF APPLICATION 15

Apply thermosetting building sealant at the following locations: 17

At vertical jambs of all interior door frames 18 At all exposed isolation, expansion, and control joints 19

At miscellaneous locations where caulking is shown on the Drawings 20 Apply firestopping sealants at the following locations, where required by code, and where indicated on the 22 Drawings: 23

- Penetrations through fire-resistance-rated walls including both empty openings and openings containing 24 cables, pipes, ducts, conduits, and other penetrating items. 25

- Penetrations through smoke-resistance walls and construction enclosing compartmentalized areas 26 involving both empty openings and openings containing penetrating items. 27

- Closing head of wall space at fire-resistant-rated walls and partitions, including both empty openings and 28 openings being penetrated. 29

- Sealant joints in fire-resistance-rated construction. 30 Apply acoustical sealant at the tops and bottoms of interior sound walls (as shown on the Drawings), and at 32 penetrations through those partitions. If the partition is also a fire-rated wall, use firestopping sealant at 33 penetrations instead. Completely fill all voids using a gun or putty knife as appropriate to the space to be filled. 34 Excess and smears shall be removed as the work progresses. 35

SCHEDULE OF SPECIAL SEALANT COLORS 37

Special sealant colors shall match Tremco colors as follows: 39

At joints between GWB and painted masonry, concrete or steel Match wall color 40 At miscellaneous locations shown on the Drawings Standard color to most closely 41 match adjacent colors 42