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ORANGE COUNTY 230719-3 <br /> <br />Emergency Management Warehouse Building Dehumidification HVAC Piping Insulation <br /> <br /> <br />Install insulation continuously through hangers and around anchor attachments: 1 <br /> 2 <br />At pipe hangers and supports, protect the insulation from compression as follows: 3 <br /> 4 <br />Piping Classification Type 1A, 2, and 3 shall be insulated with cellular glass piping insulation for the 5 <br />length of the insulation shield specified in Section 230529. Insulation vapor barrier shall be lapped 6 <br />and sealed in accordance with manufacturer’s instructions to maintain continuous vapor barrier 7 <br />integrity. 8 <br /> 9 <br />Piping Classification Type 1B, 1C, and/or 1D shall have piping insulation and jacket cut to butt the 10 <br />piping saddle specified in Section 230529. Saddle shall rest directly on the hanger. 11 <br /> 12 <br />Install insert materials and install insulation to tightly join the insert. Seal insulation to insulation inserts with 13 <br />adhesive or sealing compound recommended by insulation material manufacturer. 14 <br /> 15 <br />Cover inserts with jacket material matching adjacent pipe insulation. Install shields over jacket, arranged to 16 <br />protect jacket from tear or puncture by hanger, support, and shield. 17 <br /> 18 <br />For insulation application where vapor barriers are indicated, extend insulation on anchor legs from point of 19 <br />attachment to supported item to point of attachment to structure. Taper and seal ends at attachment to 20 <br />structure with vapor-barrier mastic. 21 <br /> 22 <br />Apply adhesives, mastics, and sealants at manufacturer's recommended coverage rate and wet and dry film 23 <br />thicknesses. 24 <br /> 25 <br />Install insulation with factory-applied jackets as follows: 26 <br /> 27 <br />Draw jacket tight and smooth. 28 <br /> 29 <br />Cover circumferential joints with 3-inch-wide strips, of same material as insulation jacket. 30 <br /> 31 <br />Secure strips with adhesive and outward clinching staples along both edges of strip, spaced 4 inches o.c. 32 <br /> 33 <br />Overlap jacket longitudinal seams at least 1-1/2 inches. Install insulation with longitudinal seams at bottom 34 <br />of pipe. Clean and dry surface to receive self-sealing lap. Staple laps with outward clinching staples along 35 <br />edge at 2 inches o.c. 36 <br /> 37 <br />For below-ambient services, apply vapor-barrier mastic over staples. 38 <br /> 39 <br />Cover joints and seams with tape, according to insulation material manufacturer's written instructions, to 40 <br />maintain vapor seal. 41 <br /> 42 <br />Where vapor barriers are indicated, apply vapor-barrier mastic on seams and joints and at ends adjacent to 43 <br />pipe flanges and fittings. 44 <br /> 45 <br />Cut insulation in a manner to avoid compressing insulation more than 75 percent of its nominal thickness. 46 <br /> 47 <br />Finish installation with systems at operating conditions. Repair joint separations and cracking due to thermal 48 <br />movement. 49 <br /> 50 <br />Repair damaged insulation facings by applying same facing material over damaged areas. Extend patches at least 4 51 <br />inches beyond damaged areas. Adhere, staple, and seal patches similar to butt joints. 52 <br /> 53 <br />Outdoor piping shall be covered by vapor barrier and exterior (weatherproofing) jacket as soon as possible after the 54 <br />insulation has been installed. All polyisocyanurate and/or polystyrene materials applied in one day shall have their 55 <br />vapor barrier installed the same day. Any exposed insulation shall be temporarily protected with a combination 56 <br />moisture and UV barrier (such as 6 mil black polyethylene film) to keep out moisture. Mastics shall not be applied 57 <br />with the ambient air temperature is below 40 F or is expected to be below 40 F within 24 hours of the application. 58 <br /> 59 <br /> 60 <br />DocuSign Envelope ID: 7668B866-6C26-485C-9A45-DAAB5D4BD951