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THE CITY OF SUNNY ISLES BEACH <br />PROJECT NO. 21-1011 <br />BUILDING DEPARTMENT RELOCATION TO ANNEX <br /> <br />Project No. 21-1011 November 2024 092216-8 <br /> <br />9. Duct interference: Were wide air conditioning ducts above gypsum board ceilings <br />interfere with suspension hangers, provide independent framing below ductwork <br />to support the ceiling. <br /> <br />a. Support framing from floor or roof structure above. Do not attach framing <br />to ductwork. Indicate layout and details of construction and attachment <br />on shop drawings. <br /> <br />H. Masonry and Concrete Wall Furring: <br /> <br />1. Furr exterior walls and designated interior walls using Z, hat, or resilient channel <br />steel furring channels fastened directly to the interior face of exterior walls and the <br />finished face or faces of interior walls. <br /> <br />a. Use Z furring channels to mechanically attach blanket foil back kraft paper <br />or rigid insulation to walls unless hat or resilient channels are indicated on <br />the drawings. Install insulation panels progressively as Z furring channels <br />are attached to the wall. <br /> <br />2. Furring Channel Erection - Direct Attachment: Attach furring channels to masonry <br />or concrete surfaces vertically unless horizontal construction is indicated on the <br />drawings. For channels positioned horizontally, attach a furring channel not more <br />than 4" from both the floor line and the ceiling line. Secure channels with fasteners <br />placed on alternate flanges and spaced 16" o.c. Use a 2" cut nail in mortar joints <br />of brick, clay tile, or concrete block, or in the field of lightweight aggregate concrete <br />block; 5/8" concrete stub nail, USG TAPCON anchors or other power-driven <br />fasteners in monolithic concrete. <br /> <br />a. Channels may be secured using adjustable wall brackets and 3/4" cold <br />rolled channels to provide additional space for pipes, conduits or ducts. <br />b. At windows, attach furring channels horizontally over masonry returns to <br />support metal lath at corners. <br /> <br />3. Free-standing Furring: Use 1-5/8" steel studs erected vertically between floor and <br />ceiling. Plumb and align runners at the desired distance from the exterior wall. <br />Fasten runners to floor and ceiling as provided for partitions. Snap studs into place <br />in the runners. <br /> <br />a. Secure the stud framing to the wall with adjustable furring brackets <br />attached to the wall at third points of the vertical span. Fasten the brackets <br />to the studs with 3/8" pan head screws. Other furring providing greater <br />height may be constructed with wider and heavier steel studs, braced as <br />indicated above but not exceeding 48" o.c. <br /> <br />4. Z-furring Channel Erection: Erect insulation vertically and hold in place with Z- <br />furring channels spaced 16" o.c. Except at exterior corners, attach narrow flanges <br />of furring channels to wall with concrete stub nails or power-driven fasteners <br />spaced 24" o.c. At exterior corners, attach wide flange of furring channel to wall