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Orange County Health Department Improvements Smith Sinnett /2024008 <br />Hillsborough,NC Orange County Asset Management Services <br />DUCT INSULATION 23 07 13 - 4 <br />5.Fittings: 0.016 inch thick die-shaped fitting covers with factory-attached protective liner. <br />6.Metal Jacket Bands: 3/8 inch wide;0.015 inch thick aluminum. <br />PART 3 EXECUTION <br />3.01 EXAMINATION <br />A Test ductwork for design pressure prior to applying insulation materials. <br />B Verify that surfaces are clean,foreign material removed,and dry. <br />3.02 INSTALLATION <br />A Install in accordance with manufacturer's instructions. <br />B Insulate all supply diffusers and ducted return grilles with 2"R6 Duct Wrap.Cut diffusers so there is a folder <br />2"lap on all four sides.Take with FSK tape where insulated flex meets duct insulation so there are no raw <br />edges of fiberglass. <br />C Install multiple layers of insulation with longitudinal and end seams staggered. <br />D Install insulation with least number of joints practical. <br />E Insulated Ducts Conveying Air Below Ambient Temperature: <br />1.Insulation on all pipes or ducts conveying air or liquids below the ambient temperature is required to <br />have a continuous vapor barrier.On all insulation with a vapor barrier,seal the joints,duct wrap seams, <br />vapor retarder (ASJ)film seams and penetrations in insulation at hangers,supports,anchors,and other <br />projections with a vapor-barrier coating/mastic as specified in the individual insulation sections. <br />2.For insulation application where vapor barriers are indicated,extend insulation on anchor legs from <br />point of attachment to supported item to point of attachment to structure.Taper and seal ends at <br />attachment to structure with vapor-barrier coating/mastic. <br />3.Install insert materials and install insulation to tightly join the insert.Seal insulation to insulation <br />inserts with adhesive or sealing compound recommended by insulation material manufacturer. <br />4.Cover inserts with jacket material matching adjacent pipe insulation.Install shields over jacket, <br />arranged to protect jacket from tear or puncture by hanger,support,and shield. <br />5.Continue insulation through walls,sleeves,hangers,and other duct penetrations. <br />F Ducts Exposed in Mechanical Equipment Rooms or Finished Spaces​​: Provide rigid fiberglass board <br />insulation and finish with ​canvas jacket sized for finish painting​. <br />G Exterior Applications: Provide rigid polyisocyanurate board insulation with vapor barrier jacket. Provide <br />rigid polyiso board insulation and cover with ​with calked aluminum jacket with seams located on bottom <br />side of horizontal duct section​. <br />H Duct Wrap Insulation Application: <br />1.Secure insulation with vapor barrier with wires and seal jacket joints with vapor barrier adhesive or <br />tape to match jacket. <br />2.Install without sag on underside of duct. Use adhesive or mechanical fasteners where necessary to <br />prevent sagging. Lift duct off trapeze hangers and insert spacers.Spacers shall be heavy density <br />insulation board material.Refer to MICA 8th edition Plate 3-640. <br />3.Seal vapor barrier penetrations by mechanical fasteners with vapor barrier adhesive. <br />4.Stop and point insulation around access doors and damper operators to allow operation without <br />disturbing wrapping. <br />3.03 SCHEDULES <br />A All supply,outside air,and return air ductwork shall be completely insulated,unless otherwise noted on the <br />plans.Insulation shall completely cover flexible connections.Insulation shall be minimum 2.5 inch thick or <br />the thickness required to meet the R-values below. <br />B All insulation within the building envelope,except in the attic (where applicable),shall have a minimum R- <br />value of 6.0 based on installed thickness.Any insulation wrap or board installed outside the building <br />envelope or in an attic,shall have a minimum R-value of 8.0 based on installed thickness. <br />C All exhaust duct associated with any unit having energy recovery (enthlpay wheel,enthalpy plate,run <br />around loop,etc.)shall be insulated to R6.0 inside the building and R8.0 outside the building. <br />Docusign Envelope ID: 2D852F9B-A7CF-462A-9536-444A53AA848A