SLOPED CEILINGS

SLOPEDCEILINGSTECHNICAL ANDINSTALLATION GUIDE

SLOPED CEILINGSTECHNICAL GUIDEARMSTRONG CEILING PANELS ACCEPTABLE IN SLOPED INSTALLATIONSMineral Fiber Lay-in, Tegular, and Vector Ceiling PanelsFiberglass Lay-in, Tegular, and Vector Ceiling PanelsMetalWorks Tegular and Vector Ceiling PanelsWoodWorks Tegular Ceiling Panels[Not all panel sizes can be installed in a sloped configuration. Panels over 4' in length must be evaluated on a case by case basis.]ARMSTRONG SUSPENSION SYSTEMS ACCEPTABLE IN SLOPED INSTALLATIONSPrelude XL 13/16"ACCESSORIES:Suprafine XLSilhouette 1/4" XLSilhouette 1/8" XLInterlude XLWALL MOLDINGS:5/16"11/16"2-3/8"BERC2 —Beam End Retaining ClipPMHDC —Maximum Hold Down Clip7808 2" Angle Molding7800 Hemmed AngleIMPORTANT SAFETY INFORMATIONSafe installation of a sloped ceiling requires project specific evaluation for compliance with building codes. The finaldesign and installation parameters are the responsibility of the design team. Armstrong has evaluated certain designconfigurations and supplied the following recommendations based on our testing: The maximum ceiling slope shall not exceed 30º U se of a maximum hold down clip is required for all sloped ceiling applications except Metalworks Vector whichhave integrated spring clips in the panel. M ain beams MUST NOT be installed perpendicular to the slope as this may result in suspension system failure. M ain beams must be spaced a maximum of 4' on center. P anels installed at a slope will tend to slide downhill. Shims must be used to prevent this. Vector panels MUST be installed with the access kerf (side A) oriented toward the top of the slope. Panels may fallout if not configured with the A side at the top of the slope. M aintenance personnel who may be removing and replacing specific panels must be trained on how to properlyreplace the panel with proper clips and orientation.2For more information, call 1 877 ARMSTRONG

SLOPED CEILINGSTECHNICAL GUIDEGENERALDesigning and installing a sloped suspended ceiling can provide the opportunity to enhance daylighting, conserveenergy, and contribute to LEED EQ Daylighting credits.Sloped ceilings are not addressed in current building codes. Current building code states that suspended ceilingmain beams must be leveled to within 1/4" on a 10' span. Alternate designs are acceptable when approved by theAuthority Having Jurisdication. This is the responsibility of the Project Design Team.Actual construction of a sloped suspended ceiling may require engineering documents by code officials/authorities having jurisdiction in your area.Armstrong Ceilings has examined sloped ceilings utilizing ceiling panels for Seismic Design Categories C, D, E, F. Wehave conducted full-scale seismic shake table testing on multiple sloped ceiling designs at the Structural EngineeringEarthquake Simulation Lab located at the State University of New York at Buffalo. Armstrong Ceilings can providedocumentation of these test results to design professionals, code officials, and building departments on a projectspecific basis in the form of a Seismic White Paper. For more information on seismic design, please reference ourSeismic Design: What You Need to Know Brochure.Since each sloped ceiling design is unique, general detail drawings accompany these guidelines. Project shopdrawings are the responsibility of the contractor. The structural engineer of record is responsible for verifying andapproving the use of Armstrong Ceilings components in these unique installations.SLOPED CEILING INSTALLATION GUIDELINESThe following guidelines are in addition to the requirements set forth in ASTM C636 and ASCE 7.ANGLE GUIDELINES Maximum ceiling slope angle shall not exceed 30 .MAXIMUM HOLD DOWN CLIP GUIDELINESThe Maximum Hold Down Clip is required for all sloped ceiling applications except MetalWorks Vector ceiling panelswhich have integrated spring clips in the panel.Metalworks Vector Spring ClipBorder TabSecurity ClipsAccess KerfBorder TabReverse Tegular13/16"Spring5/16"ClipsSpring Kerf11/16"2-3/8" EdgeReveal The use of the Maximum Hold Down Clip will reduce the accessibility of the panel.For more information, call 1 877 ARMSTRONG3

SLOPED CEILINGSTECHNICAL GUIDESHIM GUIDELINES P anels will tend to slide downhill, especially on steeper angles.shim If needed, place 1/8" or 3/32" shims (depending on panel type) between thepanel edge and the web of the cross tee at the lower edge of each panel tocenter the panel in the suspension system opening.SUSPENSION SYSTEM GUIDELINES Install main beams parallel (up/down the incline) the slope. O NOT INSTALL MAIN BEAMS PERPENDICULAR TO THE SLOPE AS THIS MAY RESULT IN SUSPENSION DSYSTEM FAILURE. Main beams should be spaced 4'-0" on center, maximum. I f I-beams, joists, or trusses are running up the slope and do not have purlins between them, bridge the beams, joists,or trusses with a material capable of supporting the ceiling system load.HANGER WIRE GUIDELINES 12 gauge hanger wire must comply with ASTM C636 requirements.Vertical HangerWire Adjacent Hanger wires should be suspended vertically and plumb.to Bracing45º orwires shall be45º I f lateral force bracing is requiredgreaterin orsevere seismic areas, it shall remain vertical and the splaygreaterinstalled at maximum 45 to the horizontal.Splay WireVertical HangerWire Adjacentto BracingSplay WireBracingInstalled VerticallyLateral Force Bracing (Compression Posts and Splay Wires)Horizontal Axis45º orgreater45º orgreaterMain BeamSloped HangerVertical HangerVerticalWire AdjacentWire AdjacentVerticalAxisto Bracingto BracingHorizontal AxisCross Tee45º orgreaterFront ViewCross TeeVertical HangerVertical HangerVerticalAxisWire AdjacentWire AdjacentMain Beamto Bracingto Bracing45º orSlopedSide ViewgreaterSplay WireSplay WireSplay WireSplay WireAxisHorizontalHorizontalAxisMain BeamMain BeamSloped SlopedCross TeeCross TeeVertical AxisVertical AxisFront ViewFront View4BracingInstalledVerticallyMain BeamSlopedVerticalCrossHangerTeeVertical HangerWire AdjacentWire Adjacentto Bracingto BracingVertical AxisTop ViewBracing ally VerticallyVertical HangerWire Adjacentto BracingHorizontal HorizontalAxisCross TeeCross TeeVertical AxisVertical AxisMain BeamMain BeamSloped SlopedSide ViewSide ViewVertical HangerWire Adjacentto Bracing45.0º45.0ºBracing BracingInstalled VerticallyInstalled VerticallyMain BeamMain Beamcall 1 877 ARMSTRONGSlopedSlopedBracing BracingInstalled InstalledVertically VerticallyMain BeamSlopedVerticalCrossHangerVertical HangerTeeWire AdjacentWire Adjacentto Bracingto BracingVertical AxisTop ViewAxisHorizontalHorizontalAxisMain BeamMain BeamSloped Sloped

SLOPED CEILINGSTECHNICAL GUIDEPERIMETER TREATMENT GUIDELINESSloped Ceilings Perimeter Solution MatrixNon-Seismic AreasSuspended CeilingSlopeOption 1Up to 30 Field Modified 2" Item 7808 WallAngle with positive cross teeattachment at all endsSeismic Cat. C, D, E, FOption 2Option 3Wall shim with 7/8" Item 7800Wall Angle kept at 90 withpositive cross tee attachment atall endsSEISMIC RX solution –Wall shim with 7/8" Item 7800 Wall Angle keptat 90 and BERC2 Clip with positive cross teeattachment on adjacent attached wallsPERIMETER TREATMENT GUIDELINESPerimeter Solution Options OPTION 1: Wall angles at the top and bottom of the slope should be re-bent to thecorrect angle by the contractor or at a local sheet metal shop.– 2" wall angle Item 7808 should be used. NOTE: If 7/8" molding is field bent upwards,the result is no room to mount your cross tees to the angle, unless you back cut theweb and bulb severely, which impacts loading.wall shims OPTION 2: Wall angles are painted and wall shimmed to achieve the correct angle.– 7/8" wall angle Item 7800 should be used.– The field crafted wall shim must keep the angle 90 to the slope.Wall Shim OPTION 3 (SEISMIC): Wall angles are painted and wall shimmed toachieve the correct angle.– 7/8" wall angle Item 7800 should be used.BERC27800 Wall Angle– The field crafted wall shim must keep the angle 90 to theslope in order to use Seismic Rx BERC2 clips.FLOATING SLOPED CEILING PERIMETERS Non-Seismic Considerations: Refer to ASTM C636 for standard practice for installation. Seismic Considerations: If sloping a floating cloud, project specific engineering is required.VECTOR CEILING PANEL CONSIDERATIONS Ultima and Optima Vector ceiling panels in a sloped installation must have the access kerf (A) oriented towardsthe top of the slope.ABFor more information, call 1 877 ARMSTRONG5

SLOPED CEILINGSTECHNICAL GUIDEQUICK REFERENCE GUIDE FOR SEISMIC SLOPED CEILINGSMineral Fiber and Fiberglass Lay-In, Tegular, andVector Ceiling PanelsPanel TypeWoodworks Tegular Panels*Metalworks Tegular and Vector Ceiling PanelsSeismic CategorySeismic CSeismic D,E, FSeismic CSeismic D,E,FGrid ASTM ClassIntermediate Duty(0 slope 15 )Heavy - Duty(15 slope 30 )Heavy - DutyHeavy - DutyHeavy - DutyNone RequiredRequiredNone RequiredRequiredPerimeter Support Wires8" or Less from WallWall Clearance3/8"3/4"3/8"3/4"Minimum WallMolding Width7/8"2" or7/8" with BERC2 Clip7/8"2" or7/8" with BERC2 ClipRequiredRequiredRequiredRequiredLateral Force Bracing(splay wires/rigid bracing)for Ceiling Areas 1,000 ft2None RequiredRequiredNone RequiredRequiredCompression Posts forCeilng Areas 1,000 ft2None RequiredRequiredNone RequiredRequiredSeismic Separation Jointsfor Ceiling Areas 2,500 ft2None RequiredRequiredNone RequiredRequired3.0 lbs/ft2(Intermediate-Duty Grid)4.0 lbs/ft2 (Heavy-Duty Grid)4.0 lbs/ft24.0 lbs/ft24.0 lbs/ft2See page 9 for layoutconfigurationSee page 10 for layoutconfigurationSee page 9 for layoutconfigurationSee page 10 for layoutconfigurationFastened Perimeter TeeConnectionsMaximum Weight per ft2Maximum Hold Down ClipConfiguration*Safety cables are required for 2' x 4' and 2' x 6' panelsQUICK REFERENCE GUIDE FOR NON-SEISMIC SLOPED CEILINGSNon-Seismic Sloped Ceiling RequirementsGrid ASTM Class6Intermediate-Duty or Heavy-DutyPerimeter Support Wires 8" or Less from WallNone RequiredWall ClearanceNone RequiredMinimum Wall Molding WidthNone RequiredFastened Perimeter Tee ConnectionsNone RequiredLateral Force Bracing (splay wires/rigid bracing)for Ceiling Areas 1,000 ft2None RequiredCompression Posts for Ceilng Areas 1,000 ft2None RequiredSeismic Separation Joints for Ceiling Areas 2,500 ft2None RequiredMaximum Hold Down Clip ConfigurationNone required.For more information, call 1 877 ARMSTRONG

SLOPED CEILINGSTECHNICAL GUIDESLOPED CEILING LAYOUTSSeismic Categories C, D, E, F Sloped Ceiling Layouts for Mineral Fiber and Fiberglass Lay-In, Tegular,Vector and Concealed Ceiling Panels and Metalworks Tegular and Vector Ceiling PanelsSeismic Category C Sloped Ceiling Layout for Slopes 15 Mains should run parallel to the slope.Category CSlope 15 Floating / Unattached SideCross TeeHigh SlopeMain BeamBERC2 ClipAttached SideFloating / Unattached SidePMHDCLow SlopeAttached SideSeismic Category C Sloped Ceiling Layout for 15 Slope 30 Mains should run parallel to the slope.*Heavy-duty grid must be used.Category C15 Slope 30 Floating / Unattached SideCross TeeHigh SlopeMain BeamBERC2 ClipAttached SideFloating / Unattached SidePMHDCLow SlopeAttached SideFor more information, call 1 877 ARMSTRONG7

SLOPED CEILINGSTECHNICAL GUIDESLOPED CEILING LAYOUTSSeismic Category D, E, F Sloped Ceiling Layout for Slopes 15 Mains should run parallel to the slope.Category D, E, FSlope 15 Floating / Unattached SideCross TeeHigh SlopeMain BeamBERC2 ClipAttached SideFloating / Unattached SidePMHDCLow SlopeAttached SideSeismic Category D, E, F Sloped Ceiling Layout for 15 Slope 30 Mains should run parallel to the slope.Category D, E, F15 Slope 30 Floating / Unattached SideCross TeeHigh SlopeMain BeamBERC2 ClipAttached SideFloating / Unattached SidePMHDCLow SlopeAttached Side8For more information, call 1 877 ARMSTRONG