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Telephone: (803) 896-4688
Email: contactllr@llr.sc.gov

Roger K. Lowe
Administrator

Teresa Martin   
Program Coordinator

Jennie Meade
Modular Program Coordinator

Georgia Lewis
Advice Attorney




South Carolina Building Codes Council

Wind Speed Zones and Seismic Design Categories

In compliance with Section 6-9-105(C) of the South Carolina Code of Laws, the Building Codes Council has defined the physical boundaries (streets, highways, streams, rivers and lakes) associated with the corresponding maps published in the International Residential Code, for the State of South Carolina concerning wind and seismic areas.  Wind design for all other buildings and structures must be based on Figure 1609A,1609B, or 1609C of the 2012 International Building Code. Site specific wind information may be obtained at  https://www.atcouncil.org/windspeed/    Seismic design for all other buildings and structures must be based on  Figure 1613.3.1(1) and 1613.3.1(2) of the 2012 International Building Code. which references the following sites: http://geohazards.usgs.gov/designmaps/us/application.php   or  http://content.seinstitue.org for seismic information mapping.

How to View and Navigate the Maps

To determine basic wind or seismic information for a county, locate the name of the county on the following chart. From that point you can determine the county's wind speed or speeds in miles per hour; the county's seismic design category or categories; and if a map is provided, the direction the map must be rotated for appropriate viewing.

For counties having only one wind speed zone and one seismic design category, the information is stated on the chart only. A map of that county is not provided. For counties that have multiple wind speed zones or multiple seismic design categories, maps illustrating the physical location of the boundaries are provided.

Before opening a map, look at the "Map Rotation” column on the chart (below) for the corresponding county. If the column states "No Rotation” the map will open in its upright position. If the column states "Clockwise” or "Counterclockwise,” the map must be rotated for proper viewing.

To open a map; click on the county icon. The maps are very memory intensive and may take several minutes to open or refresh on old or slow computers.

To rotate a map; from the Adobe screen, go to the "Menu Bar” and click on "View” then click on "Rotate Clockwise” or "Rotate Counterclockwise” accordingly. To shorten the opening time, a map may be rotated during the opening process.

To enlarge an area of a map; look at the "Magnifying Glass” icon (Zoom In / Zoom Out Tool) on the "Tool Bar.” If the magnifying glass has a plus sign in the center of the glass, it is in the enlarge mode. If the magnifying glass has a minus sign in the center of the glass, it is in the reduce mode. Select the enlarge mode and click on the "Magnifying glass” icon. A magnifying glass will appear on the screen. Move the magnifying glass to the area you want to enlarge. Each time you click the left mouse button, the area will enlarge at preset increments.

To enlarge an area in a quicker, more precise manner, move the magnifying glass slightly outside the area you want to enlarge. Click and hold the left mouse button. Create a box around the area you want to enlarge by moving the mouse. Release the mouse button.

To move a map in any direction; click on the "Hand” icon (Hand Tool) on the "Tool Bar.” A hand will appear on the screen. Click and hold the left mouse button and drag the map in the desired direction.

County

Wind Speed Range (MPH)

Seismic (IRC)

Map Rotation

Abbeville

90

B

No Map

Aiken

90

B & C

Clockwise

Allendale

93 to 100

C

Counterclockwise

Anderson

90

B

No Map

Bamberg

94 to 100

C & Do

Clockwise

Barnwell

90 to 97

C

Counterclockwise

Beaufort

105 to 112

C & Do

No Rotation

Berkeley

105 to 114

D1 & D2

Counterclockwise

Calhoun

93 to 100

C & Do

Clockwise

Charleston

110 to 116

Do, D1 & D2

Clockwise

Cherokee

90

B

No Map

Chester

90

B & C

Clockwise

Chesterfield

90 to 95

B & C

Clockwise

Clarendon

99 to 105

Do & D1

Clockwise

Colleton

100 to 112

C, Do & D1

No Rotation

Darlington

94 to 99

C

Clockwise

Dillon

98 to 103

C

Clockwise

Dorchester

100 to 111

Do, D1 & D2

Clockwise

Edgefield

90

B & C

Clockwise

Fairfield

90

B & C

Clockwise

Florence

98 to 109

C, Do & D1

Clockwise

Georgetown

110 to 116

D0 & D1

No Rotation

Greenville

90

B

No Map

Greenwood

90

B

No Map

Hampton

98 to 106

C

Clockwise

Horry

104 to 114

C & Do

No Rotation

Jasper

103 to 110

C

No Rotation

Kershaw

90 to 94

C

No Rotation

Lancaster

90

B & C

No Rotation

Laurens

90

B

No Map

Lee

93 to 99

C & Do

Counterclockwise

Lexington

90 to 95

C

No Rotation

Marion

101 to 111

Do & D1

No Rotation

Marlboro

94 to 98

C

No Rotation

McCormick

90

B

No Map

Newberry

90

B & C

Clockwise

Oconee

90

B

No Map

Orangeburg

93 to 106

C, Do & D1

Clockwise

Pickens

90

B

No Map

Richland

90 to 98

C

No Rotation

Saluda

90

C

No Map

Spartanburg

90

B

No Map

Sumter

94 to 100

C & Do

Clockwise

Union

90

B

No Map

Williamsburg

102 to 110

 Do, D1 & D2

No Rotation

York

90

B

No Map

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110 Centerview Dr.
Columbia, S.C. 29210
(803) 896-4300 | Office Hours: 8:30 a.m.- 5:00 p.,m.

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The S.C. Department of Labor, Licensing and Regulation is pleased to provide various publications in portable document format (PDF).
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