wind load requirements by zip codewind load requirements by zip code

both States. The publication is $20 Clopay's WindCode Door Calculator will help you find that door. Use IBC 200315 psf-30 psf with Case Study Areas Standard FBC 17 actually allows you to use ASCE 7-10. Effective Dates. on a Snow Contact Local Building Officials for determining required Snow Rules for snow loads can be found at: http://www.rules.utah.gov/publicat/code/r156/r156-56.htm, In addition, you can estimate/verify your snow loads by Using SNOTEL The IRC can be accessed online at www.iccsafe.org. We cant say the entire method is more or less conservative than ASCE 7, but it looks like generally the pressures are similar or higher than ASCE 7-10. regions, Use IBC 200310 psf-20 psf with Case Study Areas And As mentioned earlier, the FBC 17 has been added to MecaWind. Occasionally, the wind and snow requirements are too fluctuant for Our "Design-Your-Own" Tool to precisely calculate the engineering of a structure. An example result for Lake Charles, LA is shown below. Easily locate the building department in your area by searching online with your zip code + "building department phone number". Standards are provided for minimum design loads (live, dead, snow, wind, rain, flood, ice, and earthquake as well as the required load combinations). For flat roofs (roof angle = 0 degrees), either Gable or Monoslope may be used. 2) Garage or Rolling Doors - There are special requirements for Garage or Rolling doors that are handled in Para 1609.7. is $80.95 and may be purchased Charleston Areas Wind Zone Requirements Simplified. The text of Section 6.2.2 of ASTM E1996 shall be substituted as follows: 6.2.2 Unless otherwise specified, select the wind zone based on the basic design, Garage door glazed opening protection for windborne debris shall meet the requirements of an, 1402.3 Relocated or Moved Buildings, Wind Loads, one- and two-family dwellings and Group U occupancies where, - and two-family dwellings and Group U occupancies where, Section 1609 Structural Design, Wind Loads, Buildings, structures and parts thereof shall be designed to withstand the minimum, Section 304 Structural Design and Testing Criteria, Wind Loads, Standard for the Design and Construction of Storm Shelters of Illinois, No. Building meet requirements of Simple Diaphragm Building. SkyCiv Engineering. In addition, wind loads vary depending on a structure's location and climate region. Data to Estimate Snow Load Amounts: http://www.id.nrcs.usda.gov/snow/data/geninfo/snowload.html Abatement Ordinance (P-11) The purpose of the Abatement Ordinance (PDF) is to provide for the remedy of situations existing on real property which have been determined to have detrimental effects on the public health, safety, and/or general welfare. And Understanding and properly accounting for wind loads is essential for ensuring the structural integrity of a building or other structure. To mitigate the effects of seismic loads, structures can be designed with certain features, such as base isolation systems and energy dissipation systems. It goes further and gives the designer the option to use some criteria within FBC 17 to determine wind loads if the building meets certain requirements: 41. Videon and Yes No And 07/29/2021 Yes, I consent to receiving emails from this website. California Data http://www.ca.nrcs.usda.gov/snow/. The best way to determine the snow load zone as well as the characteristic value of the snow load is to use our online service, Geo-Zone Tool for Load Determination. In areas of the state outside of certified Snow loads can be generated as member loads on flat/monopitch roofs and duopitch roofs. And An open building is a structure having all walls at least 80% open. Wind Speed Map Wind Hazard Zones for Louisiana. Please note that both of these special provisions are included in the FBC 17 option of MecaWind. Ground Snow Loads for Ohio. Rebuilding & Restoration Laws, Licenses & Permits Getting a Building Permit Your Wind Zone Your Wind Zone Wind Hazard Zones for Louisiana Homes can and do withstand strong hurricanes, if they are designed and reinforced for the wind hazard risk of the area. 6.5.11.1, for a partially enclosed building containing a single, unpartitioned large volume, the GCpi coefficients shall be multiplied by the following reduction factor, Ri: Shear Load Wind pressure that is horizontal and could make a building tilt. Design Snow Load Analysis for Washington, Building or other structure <= 75 ft (22.86 m) height-to-least width ratio of 4 or less fundamental frequency >= 1 Hz, 43. If when selecting the MWFRS or C&C methods you are unable to select FBC and the circle to the right is RED, that means that you dont meet all of the criteria to select the FBC Alternative method. SkyCiv offers a full design report to show the calculations of the wind and snow pressures, so you can see exactly how the software calculated the wind pressures for ASCE 7-10/ASCE 7-16, EN 1991-1-4, NBCC 2015, AS/NZS 1170.2, IS 875-3, NSCP 2015, CTE DB SE-AE, and CFE and the snow load for ASCE 7-10/ASCE 7-16, EN 1991-1-3 (select countries), NBCC 2015, and AS/NZS 1170.3. We wanted to take a moment to explain some of the things we learned about Florida Building Code 2017 Wind Loads (FBC 17). And Contact Local Building Officials for determining required Snow 1) Rigid Tile - There are special guidelines for calculating the wind loads acting on Rigid Tile in Para 1609.5.3. in the next year or two. This is particularly important for tall structures, such as skyscrapers, which are more susceptible to wind loads due to their height. The State has amended the snow load requirements This isnt true, the FBC 2017 still references ASCE 7-10. 1Kq*6cxT0y[f8+]_67l'#|k%L;UgmDmh{t RrAt? Open terrain with scattered obstructions having heights generally < 30 ft. by the building official. 1 0 obj Always consult with your local building department to ensure your structure will meet the wind / snow load requirements for your area. Washington Data http://www.wa.nrcs.usda.gov/snow/, Use IBC 200320 psf-30 psf with Case Study These are important for any engineer, so they can follow the software's assumptions, calculations and design code references. Wind loads are caused by the movement of air and can be influenced by various factors, including the speed and direction of the wind, the shape, and size of the structure, and the surrounding terrain. ), 2. This can occur in areas that have extreme variations in elevation. No located on a site for which channeling effects or buffeting are a concern, 44. Structural engineers, architects, and building code officials will find the structural load requirements essential to their practice. In addition, you can estimate/verify your snow loads by Using SNOTEL ASCE 7-02, "Minimum Design Loads for Buildings and Other Structures". Idaho Data http://www.id.nrcs.usda.gov/snow/. Is h <= Lesser of L or B?Table 10-1. Based on ASCE 7-10/ASCE 7-16, EN 1991 (wind and snow), NBCC 2015 (wind and snow), AS/NZS 1170, IS 875 (wind), NSCP 2015 (wind), CTE DB SE-AE (wind), IS 875, and CFE Viento. If the above criteria are met, then the method per Para 1609.6 can be followed. Your commitment ensures the development of high quality and cutting-edge Standards. Loads, Use IBC 200315 psf-30 psf with Case Study Areas WindCode Door Related Terms ASTM E330 Areas at higher elevations Wind loads are often also referred to as Wind Pressures. : If you receive a pop-up that says "We have incomplete snow/wind data for your zip code" (this will only appear after you enter your zip code into Step 1 and you are building the structure in one of these areas). & Data to Estimate Snow Load Amounts: http://www.id.nrcs.usda.gov/snow/data/geninfo/snowload.html Subject to the limitations of Section 1609.1.1.1, residential structures using the provisions of AWC WFCM. The search function, based on Google Maps, establishes the corresponding location to determine the following: Snow: - Snow load zone And Fasteners shall be installed at opposing ends of the. will give you access to everything you need for wind and snow loading. Find out why. Loads. An additional reference is: US Standards (AISC, ACI, AWC, ADM, ASCE 7, IBC), Cross-Section Properties of Standardized Sections or Parameterized Cross-Sections, Stand-Alone Programs for Steel Structures, Stand-Alone Programs for Timber Structures, Free Structural Analysis Software for Educational Institutions, Free Introductory Training at Your University, Introduction to Structural Analysis and Design, Determining the Snow Accumulation for Height Differences on Roofs According to EN 1991-1-3, Snow Load on Monopitch and Duopitch Roofs, Abandoning Snow for Wind as the Governing Action, Increased Calculation Performance by Reducing the Nodal Degrees of Freedom, Create 3D glTF Models (*.glb and *.glTF Formats), Geo-Zone Tool: Snow Load, Wind Speed, and Seismic Load Maps. Published by the UI Department of Civil Engineering, 1986. And Seward. . 225-578-4161 at higher elevations If you run a business in a state that's subject to harsh weather conditions, such as Florida or Texas, you're probably already aware that your commercial garage door needs to conform to certain wind load requirements. They are presently working on an updated Contact Local Building Officials for determining required Snow We have added the Florida Building Code 2017 Wind Loads to our software, MecaWind (Pro feature), and this gave us an opportunity to get familar with the Florida Building Code 2017. Choose the "Proceed with estimated values" option located below "Contact Us". of Engineers, Cold Regions Research and Zone 2 is windward roof for interior zone. ABN: 73 605 703 071, Some of the building types for the wind load and snow load calculations are locked for the free version, but our. =Bl[Ra\M2#Z,_ Schmidlin, T.W., Edgell, D.J. Enter the most up-to-date wind and snow load requirements which you can get by calling your local building code authority. Vk[_R&"%)52(C=!m2:MP#z-uvJgNEJSW>MGsap#X573JYK'R?&_1G=LrF =x&|sTh)- Areas P%sZ\M3X8,-Na? Contact Local Building Officials for determining required Snow You must have JavaScript enabled in your browser to utilize the functionality of this website. Engineers Association of Michigan are currently working on a Snow Implementation of the Florida Building Code requires many design considerations to be taken into account to properly determine a structures wind load design. Contact Local Building Officials for determining required Snow And The amendments to the building codes are adopted by City Council to modify the codes to conform to . The State has amended the snow load requirements And It In conclusion, it doesnt appear based upon the examples we have checked that there is any clear advantage to using FBC 17 rather than ASCE 7. & & Load Recommendations for the Case Study areas for Colorado Data http://www.co.nrcs.usda.gov/snow/, Use IBC 20030 psf-10 psf with Case Study Areas Snow loads are caused by the accumulation of snow on a structure and can vary greatly depending on the location and climate. both States. The building mean roof height, h, does not exceed the least horizontal dimension, L or B. U.S. Atlantic Ocean and Gulf of Mexico coasts where the basic wind Use the Ground Snow Load for New Hampshire developed by the Corps Currently the above wind force software is based on the US, Australia, Canada, select European countries, India, Philippines, and Spain to help engineers determine their design wind and snow pressures for buildings. Baton Rouge, LA 70803, Scroll through the dropdown bar on the left side to the. requirements for use in the design and construction of buildings and structural components. has a map for Minimum Ground Snow Loads located at: Contact BuildingsGuide for quotes on safe and durable prefabricated steel buildings. Find out about upcoming and past events as well as educational and virtual sessions. 2022 American Society of Civil Engineers, Bidirectional energy hub successfully demonstrated in Tennessee, AEI International Student Design Competition 2023, Browse and search the full course catalog, ASCE 7-22 resources for local and SEI leaders, Newly updated industry standard ASCE 7-22 now available, Designing for Tornadoes: New Requirements in ASCE 7-22, ASCE 7-22 wind load standard adds tornado chapter, ASCE 7 Online improves accuracy and saves time on design projects, ASCE 7 Hazard Tool provides free lookup of hazard data, Using Examples to Illustrate ASCE 7-16 Wind Provisions, SEI Standard Series: ASCE 7 & The Building Codes (Part I), SEI Standard Series: ASCE 7 & the Building Codes (Part II), SEI Standard Series: Disproportionate Collapse, SEI Standard Series: ASCE/SEI 41 Seismic Retrofit, SEI Standard Series: ASCE 7-22 & IBC 2024 Update. :Ma tR,cbkgH5POoJmnSE#`((=bfj!^a11QFC0O|es _CK5UF7)A{4G9bUUAHki] =k =R:}3fy! Street: City: State: Zip: * Wind speeds derived from ASCE 7-05, ASCE 7-10 and ASCE 7-16. 8:30 AM - 12:30 PM CEST, Online Training 05/20/2021 The minimum basic wind speed requirements for each wind zone are as follows: Inland II: Structures built in the Inland II area as established by the TDI shall be designed and constructed to resist a 3-second gust basic wind speed of Nonmembers will have view-only capability. 780 CMR 1611.0 WIND LOAD 1611.1 Wind load zones: The locations of wind load zones are shown in the Figures 1611.1A, 1611.1B, 1611.1C maps. Tall structures, such as skyscrapers, are more susceptible to seismic loads due to their height. by Using SNOTEL Data to Estimate Snow Load Amounts: Snow Load by ZIP Code, Finding Location in Germany on Google Maps and Obtaining Corresponding Snow Load, Finding Snow Load Zone and Snow Load by Zip Code (ZIP), Detailed Search of Location for Determination of Characteristic Snow Load. Use IBC 200320 psf-25 psf with Case Study Areas Torsional loading shall apply to all 8 basic load cases applied at each reference corner. Available formats include print, PDF, and ASCE 7 Online digital platform. Interested in the ASCE 7 development cycle? Engineering Seismic loads, also known as earthquake loads, are a critical consideration in structural engineering, as they can have a significant impact on the design and safety of a structure. KB 001633 | Snow Load on Elevated Solar Thermal and Photovoltaic Systems on Roofs up to Dlubal RFEM 5 & RSTAB 8 - Loads: Generate Snow Loads, Dlubal Geo-Zone Tool: Interactive Snow, Wind and Seismic Zone Maps, Invitation to Online Training "RFEM 6 | Eurocode 5 | Timber Structures", Verification Example 1022 | Slab Designed According to DIN EN 1992-1-1 with NA, Verification Example 218 | Modeling a Foundation in Clay, Masonry Building on Reinforced Concrete Foundations, Canopy and Wind Loads from 0 to 90 with RWIND 2, Snow Load on Elevated Solar Thermal and Photovoltaic Systems on Roofs up to 10 Inclination, RF-LOAD-HISTORY Add-on Module for RFEM | Consideration of Plastic Deformations from Previous Load Conditions, RF-/STAGES Add-on Module for RFEM/RSTAB | Consideration of Construction Stages, RF-LINK Add-on Module for RFEM | Interface for Importing ACIS, IGES, STEP Files, RF-/STEEL AISC Add-on Module for RFEM/RSTAB | Design of Steel Members According to ANSI/AISC 360-16, RFEM/RSTAB RF-/STEEL SANS Add-on Module | Design of Steel Members According to SANS 10162-1: 2011, RF-/STEEL NBR Add-on Module for RFEM/RSTAB | Design of Steel Members According to ABNT NBR 8800: 2008, RF-/FE-LTB Add-on Module for RFEM/RSTAB | Lateral-Torsional Buckling Analysis According to Second-Order Analysis (FEM), RF-/CAVITY Add-on Module for RFEM/RSTAB | Ultimate Limit State Design of Welded Hollow Section Connections According to EC 3. 3 0 obj And The State of Vermont, Department of Labor and Industry Walls are designed to resist uplift and wind loads. Where can I find information about the sources of your online service? completed They are published on a three year cycle to reflect the latest standards of life-safety and construction technology. 07/13/2021 This course has self-guided, on-demand access from Dec. 10, 2022 to Aug. 24, 2023. Loads The closer to the Gulf, the higher the wind risk. If the height of the eave varies along the wall, the average height shall be used. authored by F.F. And TWIA Building Code for Windstorm Construction. x][s~OUS1 V*UT.w0Z,ARH&Ee7U(nt7>^]q~1|a[6/_|H_8yRHiZ,^t-sR~)WP?Gb/_\cHK.ixB=}\|IUPUm)k>wB*K Jm;wO7c=4VC/-Ab2F3FpUX}6 PZJG[NIMMR|knG:O\ F.mgk@dkHWO\WGhu4S/c]poVy^ra(4DVUA&JK)#FeKw$>lb:fypX.f;mW7 g^C+h-kHIC;78E3{r[b~{k?N Always check with your local building department for specific code requirements so that you . in Zones 2/2E: MWFRS Wind Load for Transverse, Torsional Case, MWFRS Wind Load for Long., Torsional Case. the design snow load shall be based on the ground snow loads developed To use FBC 17, select that standard in the dropdown. Simply enter in your postal code and the Google Map interactive search will locate the suburb for that postcode: This zip code (postcode) entry will return the following wind speed as per AS/NZS 1170: Copyright 2015-2023. 8:30 AM - 12:30 PM CEST, Online Training Using the SkyCivWind Speed Map, users can still enter their sites zip codes to get wind speeds and pressures. Surface Roughness "B": of notable changes to the wind load provisions. If wind loading analysis is not done correctly the resulting effects could include collapsed windows and doors, ripped off roofing, and more. If you have any questions or concerns about specific ground snow loads within the State of Arizona please call us at 1-425-420-5715. at higher elevations Zone 4 is leeward wall for interior zone. Zone 3 is leeward roof for interior zone. And SkyCiv Engineering. FBC 17 does address other nonbuilding structures, such as chimneys, tanks and similar structures. Texas Administrative Code. Data to Estimate Snow Load Amounts: http://www.id.nrcs.usda.gov/snow/data/geninfo/snowload.html for determining required Snow Loads for their municipalities. Loads, Also, the University of Wyoming has a website with Contact Local Building Officials for determining required Snow Ground Snow Loads for Ohio, http://www.id.nrcs.usda.gov/snow/data/geninfo/snowload.html, http://www.uidaho.edu/engr/cedept/publications.htm, http://www.michigan.gov/documents/cis_bcc_snow_40405_7.pdf, http://www.buildingcodes.admin.state.mn.us/printouts/snowload.pdf, http://www.crrel.usace.army.mil/techpub/CRREL_Reports/reports/TR02-6.pdf, http://www.woodtruss.com/images/nysnowmap.pdf, http://www.rules.utah.gov/publicat/code/r156/r156-56.htm, http://www.state.vt.us/labind/Fire/snowloads.htm, http://www.commerce.state.wi.us/SB/SB-CommercialBuildingsCodeEnrolledReplacV1C.pdf, http://www.wrds.uwyo.edu/wrds/wsc/climateatlas/snow.html. and Design IDs are custom designed structures. Surface Roughness "C": in "Snow Loads for Structural Design in Montana", Design load after allowed reductions shall be 30 psf. Wind- and impact-resistant structural reinforcements and design can enable homes to withstand hurricane-force winds. The Structural Engineers Association of New Mexico are presently And If wind loading analysis is not done correctly the resulting effects could include collapsed windows and doors, ripped off roofing, and more. Local codes and ammendments may govern,verify with local building department or jurisdiction. Snow load and Wind Speed loads have their own category aside from dead and live loads. For Transverse, Longitudinal, and Torsional Cases: (+) and (-) signs signify wind pressures acting toward & away from respective surfaces. The 2006 International Building Code and the 2006 International Residential Code contain the requirements adopted to determine a structure's eligibility for hail and windstorm insurance from the . from the IBC and a snow load map may be found at: The best way to determine the snow load zone as well as the characteristic value of the snow load is to use our online service,Geo-Zone Tool for Load Determination. : In Step 1 (Engineering Zip Code) choose "Enter Wind/Snow Information Manually". All versions of International Building Code since 2003 have required per Section 1504.5 that metal edge systems, except gutters, be tested per ANSI/SPRI ES-1 or ANSI/SPRI/FM 4435/ES-1 to resist wind loads in accordance with Chapter 16. Act Zone 2T is windward roof for torsional case. <>/Metadata 788 0 R/ViewerPreferences 789 0 R>> Lateral Load A pulling and pushing horizontal pressure that can cause a building to move off its foundation. Answer The basis for calculating a snow load is a snow load zone where the structure is located. 2) Garage or Rolling Doors There are special requirements for Garage or Rolling doors that are handled in Para 1609.7. Once the wind speed has been calculated, the user can provide additional information regarding the building (such as building height, type and cladding) to get the wind pressure (wind load) based on ASCE 7-10/ASCE 7-16, EN 1991-1-4, NBCC 2015, AS/NZS 1170.2, IS 875-3, NSCP 2015, CTE DB SE-AE, and CFE provisions. For the design of an actual structure, a competent professional should be consulted. In addition, you can estimate/verify your snow loads by Using SNOTEL This category includes smooth mud flats, salt flats, and unbroken ice. These features can help to reduce the impact of snow loads on a structure and increase its stability. Structural Engineers Association of Michigan are currently working Remainder of roof Zones 2/2E extending to ridge line shall use roof Zones 3/3E pressure coefficients. may be purchased 206-682-6026 or http://www.seaw.org/, In addition, you can estimate/verify your snow loads by Using SNOTEL & A publication can be purchased called published by Structural Engineers Association of Oregon. You can edit the input to re apply, and as you change your model the wind loads will automatically adjust, so you don't have to delete and reapply! 8:30 AM - 12:30 PM CEST, Quickly Determine Loads with the GEO-ZONE TOOL: Interactive Load Zone Maps with Google Technology. http://www.state.vt.us/labind/Fire/snowloads.htm If you live in a high snow or wind load area, then your structure may have some, or all, of the following: NOTE: All counties may require a minimum 20 lb. Basic Wind Speed, Ground Snow Load, Seismic Coefficients per ASCE7 Regarding this service: This website returns the values of wind speed, ground snow and seismic for the continental United States per ASCE 7-05, ASCE 7-10 and ASCE 7-16. The FBC wind provisions appear to be set up with the intent that the values can be looked up easily and calculated using the tables; however, with computer software no one method is any easier than the other to calculate, it usually is about the same number of keystrokes either way. So use the method or code that you are required to use, or that you feel is the best fit for your structure. 09/23/2021 Exposure "D": There are some other special considerations when following FBC 17. Areas at higher elevations. from the IBC through Administrative Rule R156-56. Utah Uniform Building @Vexql+|Tllz}_uw2ygKn^ SEAW at This Wind Design Calculator is used to calculate the roof edge design pressure. 441022, Moscow, ID 83844-1022. http://www.uidaho.edu/engr/cedept/publications.htm, In addition, you can estimate/verify your snow loads Building must be designed for all wind directions using the 8 load cases shown below. Click the link below to learn more about the wind / snow loads for your area: http://snowload.atcouncil.org/index.php/ Helpful? Contact Local Building Officials for snow loads for mountainous Support Montana State University, August 1989. In the case of the updated wind loads in the 2021 IRC, it took nearly a decade. In this example, we are searching for a zip code for Champaign, Illinois (61820): document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); Get updates about new products, technical tutorials, and industry insights. Using Method 2: Analytical Procedure (Section 6.5) for Low-Rise Buildings. For the ASCE 7-10 option we used Ch 27 Pt 1 for the Main Wind Force Resisting Design (MWFRS) and Ch 30 Pt 1 for the Components and Cladding (C&C). A few key changes are identified as follows and are summarized in this fact sheet: all changes t However, Risk New Risk Category IV wind speed map New wind load criteria for rooftop solar panels Revised (higher) design wind pressures on roofs of buildings with mean roof height 60 feet Starting September 1, 2020, Windstorm Certificate of Compliance applications (WPI-1) must be certified in accordance with either the 2018 International Residential Code (IRC) or the 2018 International Building Code (IBC). Pleasant, North Charleston (29420) and the entire Charleston Lowcountry area. Contact County Building Officials for determining required Snow Contact BuildingsGuide for quotes on safe and durable prefabricated steel buildings. Easily calculate Wind Speeds, Pressures, and Forces along with Snow and Seismic Loads by Location. 06/17/2021 Design Net External Wind Pressures (Sect. & Membership on a standards committee is open to everyone including non-members. That will add wind speed contour lines on the map and provide the exact wind design speed for your location. Surface Roughness "D": IBC . Where are these snow load zones defined? Exposure "C": Wind Loading Analysis - Main Wind-Force Resisting System, per ASCE 7-05 Code [wind loads on structures 2005] for Enclosed or Partially Enclosed Buildings In order for a structure to be sound and secure, the foundation, roof, and walls must be strong and wind resistant. Volume 31 (6). These loads can be either static, meaning that they are constant over time, or dynamic, meaning that they change over time. Join the discussion with civil engineers across the world. `2r4|s?xTXsu\'}F3Dm6:!R%GMIG;iTG|e*K-GRG!L!5!HT`y ;6:6iNi4jR*jXM2V3C(>Ge?"PWN`[L6gbl@N@\Oy/erG~nu*:;C 7Lo\&meK-78^{Fh|s; }tM"*/kkl0e6fwg[ 5 mRSw@Lm~jj^`9n|lA;,R n9E:EvGOF3itG?31$+|5_M:~4)4fmP[G5 )Ao|9-iK7A5qRPjB{PgxJ-j>J,u8M:sf0Xi m@E*5V6&LlhgRl H/51FgCC5$qWb}pSJoO Ep9"[5E*%!I;r9O Design pressure has positive and negative values. For an enclosed or partially enclosed building to be classified as a Low-Rise building, the following 2 conditions must both be met: For Transverse Load Case the roof pressure coefficient, GCpf, when negative in Zone 2 or 2E, shall be applied in Zone 2/2E for a distance from the edge of the roof equal to 0.5 times the horizontal dimension of the building parallel to the direction of the MWFRS being designed or 2.5*he at the windward wall, whichever is less; the remainder of Zone 2/2E extending to the ridge line shall use the pressure coefficient GCpf for Zone 3/3E.

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