Irmo, South Carolina Building Codes

Updated : 06/24/2024

Overview

Irmo, South Carolina, adopted the 2021 South Carolina Residential Code (IRC). Irmo, SC, Muni. Code § 8-32 (adoption and amendments) and S.C. Code Ann. Regs § 8-1200 through 8-1257 (adoption and amendments). Irmo, South Carolina, adopted the 2021 SC Building Code (IBC). Irmo, SC, Muni. Code § 8-31 (adoption) and S.C. Code Ann. Regs § 8-800 through 8-8120 (adoption and amendments). The State legislature did not require adoption of the 2021 International Existing Building Code (IEBC) statewide but granted local jurisdictions authority to adopt the IEBC by ordinance as needed. S.C. Code § 6-9-60

Helpful resources for Irmo, South Carolina include the following.

Residential Building Code

South Carolina adopted a statewide mandatory residential code that will control. Authority for local amendments will be limited.See PLRB, South Carolina Building Codes for more information on state level codes.

Irmo adopted the 2021 IRC, locally. Note that adoptions usually come with amendments. So, it is important to review those amendments in addition to the unamended model code.

You can find a copy of the model code here.

You can find information about amendments to the model code here.

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Drip Edge

Drip Edge: Yes

Ice Barrier

Are ice barriers required for Irmo ? No
Comments:

Drip Edges

A drip edge must be provided at eaves and rake edges of asphalt shingle roofs where required by the manufacturer. S.C. Code Ann. Regs. § 8-1228.

Ice Barrier:

The adoption of the residential code included an amendment stating that ice barrier underlayment is not required at the eaves.

• Ground snow load: 10.

• Wind speed: 115 mph.

• Topographic effects: No.

• Special wind region: No.

• Wind-borne debris zone: No.

• Seismic design category: B/C.

• Weathering damage: Moderate.

• Front-line depth: 12.

• Termite: Very Heavy.

• Winter design temp: 28.

• Ice barrier underlayment required: No.

• Flood hazards: Chapter 14.

• Air freezing index: 1500.

• Mean annual temp: 64.8.

Irmo, SC, Muni. Code § 8-32 (adoption and amendments).

Comments

Irmo, South Carolina, adopted the 2021 South Carolina Residential Code (IRC). Irmo, SC, Muni. Code § 8-32 (adoption and amendments) and S.C. Code Ann. Regs § 8-1200 through 8-1257 (adoption and amendments). 

Existing Buildings

Existing buildings, meaning buildings that were built in accordance to code at the time of construction, typically merit extra consideration in a current updated code.

The state of South Carolina adopted Appendix AJ of the adopted IRC.

The State legislature did not require adoption of the 2021 International Existing Building Code (IEBC) statewide but granted local jurisdictions authority to adopt the IEBC by ordinance as needed. S.C. Code § 6-9-60

Commercial Building Code

Irmo adopted the 2021 IBC, locally. Note that adoptions usually come with amendments. So, it is important to review those amendments in addition to the unamended model code.

You can find a copy of the code here.You can find information about the adoption without amendment to the model code here.

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Comments

Irmo, South Carolina, adopted the 2021 SC Building Code (IBC). Irmo, SC, Muni. Code § 8-31 (adoption) and S.C. Code Ann. Regs § 8-800 through 8-8120 (adoption and amendments). 

Existing Buildings

The State legislature did not require adoption of the 2021 International Existing Building Code (IEBC) statewide but granted local jurisdictions authority to adopt the IEBC by ordinance as needed. S.C. Code § 6-9-60

Other Building Codes

Irmo, South Carolina, adopted the 2021 South Carolina Plumbing Code (IPC), with amendments. Irmo, SC, Muni. Code § 8-34 (adoption).

Irmo, South Carolina, adopted the 2021 South Carolina Mechanical Code (IMC), with amendments. Irmo, SC, Muni. Code § 8-36 (adoption).

Irmo, South Carolina, adopted the 2021 South Carolina Fuel Gas Code (IFGC), with amendments. Irmo, SC, Muni. Code § 8-35 (adoption) and S.C. Code Ann. Regs § 8-1000 through 8-1007.

Irmo, South Carolina, adopted the 2021 South Carolina Fire Code (IFC), with amendments. Irmo, SC, Muni. Code § 8-37 (adoption) and S.C. Code Ann. Regs § 8-900 through 8-927.

Irmo, South Carolina, adopted the 2020 National Electric Code (NFPA 70), with amendments. Irmo, SC, Muni. Code § 8-33 (adoption) and S.C. Code Ann. Regs. § 8-1100 through 8-1106.

Irmo, South Carolina, adopted the 2017 ICC Ansi 117.1 Accessibility Code, with amendments. Irmo, SC, Muni. Code § 8-39 (adoption) and § 10-5-210 et seq.

Irmo, South Carolina, adopted the 2018 International Property Maintenance Code (IPMC), with amendments. Irmo, SC, Muni. Code § 11-12 (adoption).

Irmo, South Carolina, adopted the 2009 International Energy Conservation Code (IECC), with amendments. Irmo, SC, Muni. Code § 8-38 (adoption).