Laserfiche WebLink
Round 1 Bowling and Amusement 12/09/2024 Paradigm Design <br />Main Place Mall Expansion Grand Rapids, MI <br />Santa Ana, California <br />Project #2309147GR <br />HVAC INSULATION 23 0700 - 20 <br />b.Install vapor stops for ductwork and plenums operating below 50 deg F at 18-foot <br />intervals. Vapor stops shall consist of vapor-barrier mastic applied in a Z-shaped <br />pattern over insulation face, along butt end of insulation, and over the surface. <br />Cover insulation face and surface to be insulated a width equal to 2 times the <br />insulation thickness but not less than 3 inches. <br />5.Overlap unfaced blankets a minimum of 2 inches on longitudinal seams and end joints. <br />At end joints, secure with steel bands spaced a maximum of 18 inches o.c. <br />6.Install insulation on rectangular duct elbows and transitions with a full insulation section <br />for each surface. Install insulation on round and flat-oval duct elbows with individually <br />mitered gores cut to fit the elbow. <br />7.Insulate duct stiffeners, hangers, and flanges that protrude beyond insulation surface with <br />6-inch-wide strips of same material used to insulate duct. Secure on alternating sides of <br />stiffener, hanger, and flange with pins spaced 6 inches o.c. <br />B.Board Insulation Installation on Ducts and Plenums: Secure with adhesive and insulation pins. <br />1.Apply adhesives according to manufacturer's recommended coverage rates per unit area, <br />for 100 percent coverage of duct and plenum surfaces. <br />2.Apply adhesive to entire circumference of ducts and to all surfaces of fittings and <br />transitions. <br />3.Install either capacitor-discharge-weld pins and speed washers or cupped-head, capacitor- <br />discharge-weld pins on sides and bottom of horizontal ducts and sides of vertical ducts as <br />follows: <br />a.On duct sides with dimensions 18 inches and smaller, place pins along longitudinal <br />centerline of duct. Space 3 inches maximum from insulation end joints, and 16 <br />inches o.c. <br />b.On duct sides with dimensions larger than 18 inches, space pins 16 inches o.c. each <br />way, and 3 inches maximum from insulation joints. Install additional pins to hold <br />insulation tightly against surface at cross bracing. <br />c.Pins may be omitted from top surface of horizontal, rectangular ducts and plenums. <br />d.Do not overcompress insulation during installation. <br />e.Cut excess portion of pins extending beyond speed washers or bend parallel with <br />insulation surface. Cover exposed pins and washers with tape matching insulation <br />facing. <br />4.For ducts and plenums with surface temperatures below ambient, install a continuous <br />unbroken vapor barrier. Create a facing lap for longitudinal seams and end joints with <br />insulation by removing 2 inches from 1 edge and 1 end of insulation segment. Secure <br />laps to adjacent insulation section with 1/2-inch outward-clinching staples, 1 inch o.c. <br />Install vapor barrier consisting of factory- or field-applied jacket, adhesive, vapor-barrier <br />mastic, and sealant at joints, seams, and protrusions. <br />a.Repair punctures, tears, and penetrations with tape or mastic to maintain vapor- <br />barrier seal. <br />b.Install vapor stops for ductwork and plenums operating below 50 deg F at 18-foot <br />intervals. Vapor stops shall consist of vapor-barrier mastic applied in a Z-shaped <br />pattern over insulation face, along butt end of insulation, and over the surface.