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Service. Quality. Reliability.BAR GRATING CATALOG
WelcomeTo the ReaderThe Bar Grating AdvantageThe following presentation of bar grating products hasFor nearly a century, metal bar grating has been the predominant choice for open metal flooring. Features that make bargrating the preferred product include:been compiled to serve the diverse needs of design professionals as well as the specific needs of the end user.By describing the extensive line of bar gratings offered byGrating Pacific, this catalog serves as a useful tool for defining materials, methods of assembly, fabrication, and finish alternatives. Whether your needs include only a simplestair and platform or an entire industrial processing facility,the products described in this catalog offer a comprehensive menu of open metal flooring features from which themost appropriate may be selected. Appropriate Materials – Carbon steel, aluminum, stainless steel, and specialty alloys provide safe, durable, andfunctional products for nearly all environments. High Percentage of Open Area – Typically ranging from50 to 80 percent, allows for the unhindered passage oflight, air, and liquids reducing costs for lighting, ventilation, and fire suppression. High Strength-to-Weight Ratio – Designed for maximum efficiency and capable of supporting loads rangingfrom light pedestrian traffic to the heaviest vehicular andaircraft loads. Product Flexibility – Easily fabricated to suit the exactconfiguration of your application. Economy – Commonly shop fabricated and finished tomeet the specific intricacies of each project. Once delivered to the site and fastened in place the floor is immediately ready for service. Maintenance-Free – The high percentage of open areaallows for excellent drainage and the free passing of debris, thus creating a virtually maintenance-free floor.GRATING PACIFIC Service. Quality. Reliability. Phoenix, AZ (888) 936-9201 Los Alamitos, CA (800) 321-4314
ContentsIntroduction2Product Specification3Steel Bar GratingOverviewLoad TablesStair TreadsAluminum Bar GratingOverviewLoad TablesStair Treads4-56-101112-1314-1819Aluminum Plank GratingOverviewLoad TablesService. Quality. Reliability.Founded in 1971 on the unyielding principle of “Service First,”Grating Pacific has grown to include five service centers strategically located in the western United States. As our business evolved, it became apparent that unparalleled servicealso demanded premium quality and steadfast reliability aswe partner with our customers to deliver products to an everexpanding market. Each of us at Grating Pacific welcomethe opportunity to deliver every aspect of our business withService. Quality. Reliability.2021Stainless Steel Bar GratingOverviewLoad TablesStair Treads22-2324-2829Riveted GratingOverviewLoad Tables3031-33ALGRIP Grating & Plate34-35Heavy Duty Steel GratingOverviewLoad Tables36-3738-42Bridge Decking43Embed Frames44-45Trench & Inlet Systems46-49Coda Architectural Products50-53Louver Grate & Architectural Gratings54-57Installation InformationBanding & Panel LayoutFastenersManufacturing & Installation585960Glossary61NAAMM – The National Association of Architectural Metal Manufacturers consists of five operating divisions, each focused on specific metal products for building andrelated applications. Each division develops and maintains technical standards for its products and actively promotes their use by design professionals.The Metal Bar Grating Division of NAAMM publishes the only manuals for standard and heavy duty gratings which are recognized by ANSI, the American NationalStandards Institute. These ANSI/NAAMM standards are your guide in assuring that your grating needs are satisfied by products of consistent quality and availability.Grating Pacific, an active NAAMM member in good standing, designs, manufactures and fabricates bar grating in strict accordance with published NAAMM standards.Supporting engineering documentation is available upon request.Tracy, CA (800) 491-7999 Woodburn, OR (800) 942-4041 Kent, WA (800) 243-3939 www.gratingpacific.com1
IntroductionMetal Bar Gratingis the workhorse of the industrial flooring market and has served industry for decades. Strong and durable withan exceptional strength-to-weight ratio, metal bar grating can be easily fabricated to nearly any configuration. The high percentage of open area makesbar grating practically maintenance-free and all products are fully recyclable.Manufactured by assembling a series of equally spaced metal bars to connectingcross members, bar grating is available in three popular materials; mildcarbon steel, 6000 series aluminum, and 300 series stainlesssteels. Additionally, Grating Pacific has the capacityto produce gratings constructed with otherspecialty metal alloys.ar s.nt.ng bainrepaseSBar n elem ars of the bBing ing mainrositaisB e d c ar r yC r o ur e s p o scL oaeSdthCross BarSpacingBearing Bar SpacingMeasured from center-tocenter of the bearing bars in1/16" increments. Standardspacing for industrial flooringis 19/16" (1-3/16") on center.Other popular spacings are15/16", 11/16", 1/2", and7/16" on center.WiMeasured from centerto-center of cross bars in 1"increments. Standard spacing is 4"on center with 2" spacing availableon special order.BearingBar DepthRanges from 3/4"to 7" depending onanticipated loads.Bearing Bar ThicknessRanges from 1/8" to 1/2" depending onanticipated loads.Manufacturing MethodsWelded GratingEconomical design ideal for mostindustrial applications. Manufacturedby welding the bearing bar/cross barintersection, typically with automatedforge welding equipment. Available incarbon steel and stainless steel.Swage Locked GratingPopular for the manufacture ofaluminum, stainless steel, and closemesh gratings. Cross bars are insertedinto pre-punched holes in the bearingbars and hydraulically deformed to lockthe bars in place.2Dovetail PressureLocked GratingAssembled by inserting pre-punchedbearing and cross bars into an “eggcrate” configuration and deformingthe cross bars under intense hydraulicpressure. Available in all materials andideal for architectural and ornamentalapplications.Riveted GratingExceptionally durable gratingmanufactured by riveting bearing barsand bent connecting bars at their contactpoints. Excellent for applicationsinvolving impact loads and repetitivetraffic patterns.GRATING PACIFIC Service. Quality. Reliability. Phoenix, AZ (888) 936-9201 Los Alamitos, CA (800) 321-4314
Product SpecificationService LoadsThe load tables on the pages within this catalog provide load/deflection criteria for most common applications. These tablesprovide a concise reference allowing the specifying authorityto select the appropriate bearing bar size and spacing for theintended application.W idthSp a nPedestrian loads are commonly analyzed with uniform andconcentrated loads. For pedestrian comfort, deflection is typicallylimited to 1/4".Heavy duty and vehicular load tables are presented for specificload conditions. Heavy duty load tables are presented withdeflection limited to the lesser of 1/8" or L/400.UnIf your application is not addressed by the load tables found in thiscatalog, please contact Grating Pacific for assistance selecting theproduct most appropriate for your application.s upp orte dSp anSpecification CriteriaWhen specifying metal bar grating it is important to considerthe following factors: Service load required and acceptable deflection Unsupported clear span Flooring surface Banding and trim FinishSurface OptionsBandingThe open ends of the grating may be banded to provide additionaltransverse stiffness and a finished architectural appearance.Achieved by welding a flat bar, similar in size to the bearing bars,to the cut end, banding enhances safety and should always bespecified when gratings are designed to be removable.Plain SurfaceStandard surface withexcellent “self-cleaning”characteristics. Suitable formost applications.Serrated SurfacePreferred for applicationswhere moisture or fluidscause the walking surfaceto become wet and slippery.Algrip SurfaceDurable slip-resistantdeposits on the walkingsurface provide enhancedslip-resistance forapplications in the publicway (see page 34).Banding can reduce impact stress by transferring load to adjacentbearing bars and should always be specified when gratings aresubject to vehicular loads. Further banding descriptions anddetails may be found on page 58.FinishesSteel products are commonly provided with one of three finishes: bare steel (no finish);painted with one coat of manufacturers red, black or silver paint; or hot dip galvanized inaccordance with ASTM A-123.Aluminum products are offered mill finish with optional chemical cleaning or anodizingalso available.Stainless Steel products typically require secondary cleaning due to discoloration thatoccurs during welding and fabrication. Commercial cleaning, passivation, or abrasiveblasting can provide a uniform matte surface while electro-polishing leaves a brightstainless finish.Other - All products can be provided with specialty finishes including enamel or epoxyPaintedSteelMill Finished &Anodized Aluminumpaints, or powder coating. When considering specialty finishes, contact Grating Pacificfor consultation.Tracy, CA (800) 491-7999 Woodburn, OR (800) 942-4041 Kent, WA (800) 243-3939 www.gratingpacific.com3
Steel Bar GratingSteel Bar GratingSteel bar grating is manufactured from ASTM A-1011 mild carbon steel and is available in three distinct products: type“W” welded bar grating, type “DT” dovetail pressure locked grating, and type “SL” swage locked grating. All threeproducts are available with bearing bar spacing ranging from 19/16" (1-3/16") to 7/16" on center and with crossbars at either 4" or 2" on center.Each product has a standard plain surface or may be specified with optional serrated or Algrip surfaces.Finish options include bare steel, painted, hot dip galvanized, or specialty coatings.The load tables on pages 6-10 provide detailed specification information related to these products.Type “W” Welded Steel GratingOur most economical steel grating products, type “W” welded steel gratings aremanufactured by forge welding rectangular bearing bars and drawn cross bars.This welding process provides a positive fused connection providing years ofservice under the most demanding conditions.Type 19-W-4 steel grating is our most popular product and is recommended fornearly all industrial flooring applications. With nearly 80% open area, 19-W-4allows for the easy passage of dirt, debris, snow, and liquids and is essentiallyself-cleaning.Type11-W-4Type “W” gratings are available in close mesh, ADA conformingspacings 11-W-4 and 7-W-4 which are commonly used in publicareas.When specifying type 11-W-4 for ADAapplications, 3/16" thick bearing barsmust be specified.Type19-W-4WELDED STEELINTERSECTIONType “SL” SwageLocked Steel GratingType “DT” Dovetail PressureLocked Steel GratingType “DT” steel gratings have deep rectangular cross bars and aremanufactured by inserting pre-punchedDOVETAILbearing bars and cross bars into anINTERSECTION“egg-crate” configuration anddeforming the cross bars underintense hydraulic pressure.The deep cross bars on type “DT”gratings make them popular forarchitectural applications such assun shades and infill panels with thedeeper cross bar serving as a distinctarchitectural accent.4Type “SL” steel gratings aremanufactured by insertinghollow tube cross bars intopre-punched holes inthe bearing bars. Thecross bars are thenswaged forming apositive mechanicalconnection. The crossbars are recessed belowthe top surface of the bearingbars providing a uniform and attractivearchitectural appearance.Swage locking is a particularly efficientprocess for the production of closemesh gratings. Type 7-SL-4 with3/16" thick bearing bars provides anet 1/4" clear opening between thebearing bars. This narrow openingis often preferred in public areaswhere concerns of drainage andthe presence of high heeled shoesconverge.SWAGEDINTERSECTIONGRATING PACIFIC Service. Quality. Reliability. Phoenix, AZ (888) 936-9201 Los Alamitos, CA (800) 321-4314
Steel Bar GratingSteel Grating Table of SpacingsPart en "58% 7/16"1/2"7/16"54%2"2"Bearing bars spaced at 1-3/16" on center and cross bars at 2"on2"center.2" 2"2"Excellent for short spans and applications where smallwheeled carts continuously cross the grating surface.Bearingbars2" spaced at 15/16" on center and cross bars at 4" on2"2" 2"center. The closer spaced bearing bars increase load capacity bymore than 26% when compared to similar gratings produced with2" 2" 2" 2"bearing bars at 1-3/16" on center.2"2"Bearing bars spaced at 15/16" on center and cross barsat 2" on center. The closer spaced bearing bars and cross bars2"2" 2"2"provideadditional flooring surface to support pedestrian andwheeled traffic.2"2"2"2" 2"2"Bearing bars spaced at 11/16" on center and cross bars at either2"2" on2"center. Types 11-4 and 11-2 with 3/16" thick bearing4" or2"2"bars comply with the spacing requirements of the Americans withDisabilities Act. For ADA installations, specify that the bearing bars2" 2"2"2" perpendicular to the normal flow of traffic.span2"2"Bearingbarsspaced at 1/2" on center and cross bars at 4" or 2" on2"2"2" Types2" 8-4 and 8-2 comply with ADA spacing requirements.center.These products are popular for material handling platforms andmezzanines subject to continuous cart and dolly "2"2" Bearing bars spaced at 1-3/16" on center and cross bars at 4" oncenter. The workhorse of industrial flooring, popular for platforms,catwalks, mezzanines, and stairways.49%2"Bearing bars spaced at 7/16" on center and cross bars at 4" or 2"on center. Types 7-4 and 7-2 comply with ADA spacing requirementsand are popular for applications in the public way. When specifiedwith 3/16” thick bearing bars, 7-4 and 7-2 gratings have a net1/4" clear opening between the bearing bars and commonly rejectintrusion by high heeled shoes.* Percentage of open area is based upon 3/16" thick bearing bars and .275" cross bars. Contact Grating Pacific if exact open area calculation is required for alternative bearing bar thicknesses or cross bar sizes.How to Specify Steel Bar Grating1. Select type of grating “W” for welded steel grating “DT” for dovetail pressure locked grating “SL” for swage locked grating2. Select bar spacing from table above3. Select bearing bar size (consult load tables on pages 6-10considering service loads and clear spans)4. Specify plain, serrated, or Algrip surface5. Specify banding or additional trim required6. Specify finish Bare steel (no finish) Painted (red, black, silver, other) Hot dip galvanized (per ASTM A-123) Other7. Specify fasteners (if required) – see page 59Tracy, CA (800) 491-7999 Woodburn, OR (800) 942-4041 Kent, WA (800) 243-3939 www.gratingpacific.com5
Steel Bar Grating19 SpaceUse this table when evaluating spans and loads for the following types of steel grating:19-W-4, 19-W-2, 19-DT-4, 19-DT-2, 19-SL-4, & 19-SL-2(1-3/16") Load TableBearingBar Size(inches)Approx.Weightpsf *3/4 x 1/83.9Max. Sec. Prop.***Ped.Sx in3Span**Ix in43'-5"0.1180.0443/4 x 3/165.63'-10"0.1780.0671 x 1/85.04'-3"0.2110.1051 x 3/167.24'-9"0.3160.1581-1/4 x 1/86.15'-1"0.3290.2061-1/4 x 3/168.95'-7"0.4930.3081-1/2 x 1/87.25'-10"0.4740.3551-1/2 x 3/1610.76'-5"0.7110.5331-3/4 x 1/88.56'-6"0.6450.5641-3/4 x 3/1612.37'-3"0.9670.8462 x 1/89.67'-4"0.8420.8422 x 3/1613.98'-0"1.2631.2632-1/4 x 3/1615.68'-9"1.5991.7992-1/2 x 3/1617.29'-5"1.9742.467Unsupported 13,3840.0735'-05'-66'-06'-67'-08'-09'-0All loads and deflections are theoretical and based uponthe gross sections of the bearing bars, using a fiber stressof 18,000 psi.The values are not intended to be absolute since theactual load capacity will be affected by the slightvariations in mill and manufacturing 1,9180.1669470.1862,3680.149Grating for spans to the left of the heavy line have adeflection 1/4" for uniform loads of 100 180U uniform load in pounds/sq. ft.C concentrated load in pounds/ft. of gratingwidthD deflection in 2920.6031,3160.483* Weight per square foot based upon 19-W-4 grating. Add .60 psf for 2" on center cross bars. ** Maximum pedestrian load is defined as a 100# uniform load with deflection 1/4 inch. (The 1/4" maximum deflection criteria isconsidered consistent with pedestrian comfort, but may be exceeded for other loading conditions at the discretion of the specifying authority.) *** Section properties per foot of width.Note: When gratings with serrated surface are specified, the depth of the grating required for a specific load will be 1/4" greater than that shown in these tables.Panel WidthsGrating panels are available from stock in nominal 24", 36" and 48" widths. When considering alternative widths, consult this table to select widths that will maintain uniform “out-to-out” spacing of the bearing bars.Specified widths deviating from this table will be fabricated to size with side banding and the bar spacing on one side of the finished panel will vary from the spacing throughout the remainder of the panel.6Number of Bearing BarsPanel /4"14-7/16"15-5/8"16-13/16"18"Number of Bearing BarsPanel 1/16"29-7/8"31-1/16"32-1/4"33-7/16"Number of Bearing BarsPanel -5/8" 35-13/16"Panel widths indicated are for gratings with 3/16" thickbearing bars. For 1/8" thick bearing bars deduct 1/16" fromthe stated values.Indicates stock panel widths.GRATING PACIFIC Service. Quality. Reliability. Phoenix, AZ (888) 936-9201 Los Alamitos, CA (800) 321-4314
Steel Bar Grating15 SpaceUse this table when evaluating spans and loads for the following types of steel grating:(15/16") Load Table15-W-4, 15-W-2, 15-DT-4, 15-DT-2, 15-SL-4, & 15-SL-2BearingBar Size(inches)3/4 x 3/161 x 1/8Approx.Weightpsf *6.96.2Max. Sec. Prop.***Ped.Sx in3Span**Ix in44'-0"Unsupported CDUDCD0.2250.0844'-6"0.2670.1331 x 3/168.95'-0"0.4000.2001-1/4 x 1/87.55'-4"0.4170.2601-1/4 x 3/1611.05'-11"0.6250.3911-1/2 x 1/88.96'-2"0.6000.4501-1/2 x 3/1613.26'-10"0.9000.6751-3/4 x 1/810.46'-11"0.8170.7151-3/4 x 3/1615.37'-8"1.2251.0722 x 1/811.87'-7"1.0671.0672 x 3/1617.38'-6"1.6001.6002-1/4 x 3/1619.49'-3"2.0252.2782-1/2 x 495'-66'-06'-67'-08'-09'-0All loads and deflections are theoretical and based upon thegross sections of the bearing bars, using a fiber stress of18,000 psi.The values are not intended to be absolute since the actualload capacity will be affected by the slight variations in milland manufacturing tolerances.Grating for spans to the left of the heavy line have a deflection 1/4" for uniform loads of 100 0250.2388330.2682,5000.215U uniform load in pounds/sq. ft.C concentrated load in pounds/ft. ofgrating widthD deflection in 1,3500.5363700.6031,6670.483* Weight per square foot based upon 15-W-4 grating. Add .60 psf for 2" on center cross bars. ** Maximum pedestrian load is defined as a 100# uniform load with deflection 1/4 inch. (The 1/4" maximum deflection criteria isconsidered consistent with pedestrian comfort, but may be exceeded for other loading conditions at the discretion of the specifying authority.) *** Section properties per foot of width.Note: When gratings with serrated surface are specified, the depth of the grating required for a specific load will be 1/4" greater than that shown in these tables.Panel WidthsGrating panels are available from stock in nominal 24" and 36" widths. When considering alternative widths, consult this table to select widths that will maintain uniform “out-to-out” spacing of the bearing bars.Specified widths deviating from this table will be fabricated to size with side banding and the bar spacing on one side of the finished panel will vary from the spacing throughout the remainder of the panel.Number of Bearing BarsPanel -7/16"12-3/8"13-5/16"14-1/4"Number of Bearing BarsPanel ber of Bearing BarsPanel "33"33-15/16"34-7/8"35-13/16"Panel widths indicated are for gratings with 3/16" thick bearing bars. For 1/8" thick bearing bars deduct 1/16" from the stated values.Indicates stock panel widths.Tracy, CA (800) 491-7999 Woodburn, OR (800) 942-4041 Kent, WA (800) 243-3939 www.gratingpacific.com7
Steel Bar Grating11 SpaceUse this table when evaluating spans and loads for the following types of steel grating:11-W-4, 11-W-2, 11-DT-4, 11-DT-2, 11-SL-4, & 11-SL-2(11/16") Load TableBearingBar Size(inches)Approx. Max. Sec. Prop.***WeightPed.Sx in3psf * Span**Ix in43/4 x 3/169.14'-4"Unsupported CDUDCDUDCD0.3070.1151 x 1/88.14'-11"0.3640.1821 x 3/1611.95'-5"0.5450.2731-1/4 x 1/810.05'-9"0.5680.3551-1/4 x 3/1614.76'-5"0.8520.5331-1/2 x 1/811.96'-8"0.8180.6141-1/2 x 3/1617.77'-4"1.2270.9201-3/4 x 1/813.97'-5"1.1140.9741-3/4 x 3/1620.58'-3"1.6701.4622 x 1/815.88'-3"1.4551.4552 x 3/1623.39'-1"2.1822.1822-1/4 x 3/1626.110'-0"2.7613.1072-1/2 x -06'-67'-08'-09'-0All loads and deflections are theoretical and based upon thegross sections of the bearing bars, using a fiber stress of18,000 psi.The values are not intended to be absolute since the actual144 load capacity will be affected by the slightvariations in mill and manufacturing tolerances.0.563397 Grating for spans to the left of the heavy line have a0.451 deflection 1/4" for uniform loads of 100 psf.216182 U uniform load in pounds/sq. ft.0.5630.670 C concentrated load in pounds/ft. ofgrating width595546 D deflection in .3600.4290.504338284242209
2 GRATING PACIFIC Service. Quality. Reliability. Phoenix, AZ (888) 936-9201 Los Alamitos, CA (800) 321-4314 Tracy, CA (800) 491-7999 Woodburn, OR (800) 942-4041 Kent, WA (800) 243-3939 www.gratingpacifi c.com Introduction Welded Grating Economical design ideal for most industrial applications. Manufactured by welding the bearing bar/cross bar
