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

Roger K. Lowe
Administrator

Teresa Martin   
Program Coordinator

Jennie Meade
Modular Program Coordinator

Georgia Lewis
Advice Counsel to the Board

**The Office of Advice Counsel is responsible for
providing legal advice to all Boards, Commissions
and Panels, as well as their administrative staff.
These attorneys do not provide legal advice to
parties outside LLR.



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 basic wind speed map published in the International Residential Code, for the State of South Carolina. The seismic design categories, are based on the International Residential Code and apply only to single and two family residences. Seismic design for all other buildings and structures must be based on the latest version of the Compact Disk titled “Seismic Design Parameters” (USGA Open-File Report 01-437), prepared in conjunction with the U.S. Geological Survey Building Seismic Safety Council, and Federal Emergency Management Agency, E.V. Leyendecker, A.D. Frankel, and K.S. Rukstales. To obtain a copy of the Seismic Design Parameters CD, contact the International Code Council.

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

115

B

No Map

Aiken

115 to 117

B & C

Clockwise

Allendale

118 to 124

C

Counterclockwise

Anderson

115

B

No Map

Bamberg

118 to 127

C & Do

Clockwise

Barnwell

115 to 120

C

Counterclockwise

Beaufort

133 to 144

C & Do

No Rotation

Berkeley

133 to 145

D1 & D2

Counterclockwise

Calhoun

117 to 128

C & Do

Clockwise

Charleston

139 to 150

Do, D1 & D2

Clockwise

Cherokee

115

B

No Map

Chester

115

B & C

Clockwise

Chesterfield

115 to 120

B & C

Clockwise

Clarendon

125 to 134

Do & D1 & D2

Clockwise

Colleton

125 to 142

C, Do & D1

No Rotation

Darlington

118 to 125

C & Do

Clockwise

Dillon

123 to 132

C

Clockwise

Dorchester

129 to 142

Do, D1 & D2

Clockwise

Edgefield

115

B & C

Clockwise

Fairfield

115

B & C

Clockwise

Florence

124 to 139

C, Do & D1

Clockwise

Georgetown

140 to 150

Do & D1

No Rotation

Greenville

115

B

No Map

Greenwood

115

B

No Map

Hampton

122 to 132

C

Clockwise

Horry

133 to 150

C & Do

No Rotation

Jasper

129 to 139

C

No Rotation

Kershaw

115 to 118

C

No Rotation

Lancaster

115 to 116

B & C

No Rotation

Laurens

115

B

No Map

Lee

118 to 128

C & Do

Counterclockwise

Lexington

115 to 118

C

No Rotation

Marion

129 to 142

C & Do

No Rotation

Marlboro

117 to 127

B & C

No Rotation

McCormick

115

B

No Rotation

Newberry

115

B & C

Clockwise

Oconee

115

B

No Map

Orangeburg

117 to 133

C, Do & D1

Clockwise

Pickens

115

B

No Map

Richland

115 to 121

C

No Rotation

Saluda

115

B & C

No Map

Spartanburg

115

B

No Map

Sumter

118 to 129

C & Do

Clockwise

Union

115

B

No Map

Williamsburg

130 to 141

 Do, D1 & D2

No Rotation

York

110

B

No Map

Synergy Business Park; Kingstree Building
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).
You will need Adobe Reader to view and print these publications.