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Notice - Code Interpretation Changes

2012 IRC Protection of Openings
2006-2012 State Modification of Section 202

On September 1, 2014 the Town of Hilton Head Island Building Division will be implementing Section R301.2.1.2 (Exception) to the 2012 International Residential Code (IRC) Protection of Openings. Any building permit submitted after August 31, 2014 will be subject to the implementation of Section 301.2.1.2 of the IRC. The change that will be implemented is as follows:

R301.2.1.2 Protection of Openings.

Exterior glazing in building located in windborne debris regions shall be protected from windborne debris. Glazed opening protection for windborne debris shall meet the requirements of the large Missile Test of ASTM E 1996 and ASTM E 1886 referenced therein. The applicable wind zones for establishing missile types in ASTM E 1996 are shown on figure R301.2(4)C. garage door glazed opening protection for windborne debris shall meet the requirements of an approved impact-resisting standard or ANSI/DASMA 115.

Exception: Wood structural panels with a minimum thickness of 7/16 inch and a maximum span of 8 feet shall be permitted for opening protection in one and two-story single family  buildings. Panels shall be precut and attached to the framing surrounding the opening containing the product with the glazed opening. Panels shall be predrilled as required for the anchorage method and shall be secured with the attachment hardware provided. Attachments shall be designed to resist the component and cladding loads determined in accordance with either Table R301.2 (2) or ASCE 7, with the permanent corrosion-resistant attachment hardware provided and anchors permanently installed on the building. Attachment in accordance with Table R301.2.1.2 is permitted for buildings with a mean roof height of 33 feet or less where located in Wind Zones 1 and 2 in accordance with Figure R301.2(4)C.

If this exception is used, the plans will be required to show a detail with the attachment hardware to be provided and the spacing of the fasteners. The precut and predrilled 7/16 inch wood structural panels with permanently installed anchors meeting the above listed requirements for one and two-story building built under the IRC will be required onsite at the time of the Final/CO inspection.

2006-2012 IRC Modification Deletion

On September 1, 2014 the Town of Hilton Head Island Building Division will be implementing the 2012 South Carolina Building Code statewide modifications to the 2012 IRC, specifically Section 202.

In the 2006 South Carolina Building Code statewide modifications, the definition of the word "Story" was expanded to include language, to allow single and two-family residences to be built in accordance with the International Residential Code (IRC) when there are three habitable stories above a usable story, which is not habitable but exists for the purpose of raising the house above the flood plain.

The definition reads as follows: "Story" - That portion of a building included between the upper surface of a floor and the upper surface of the floor or roof next above. For the purpose of determining the appropriate code to be used, when the first story is built in the flood plain, a 'Story' must be 'Habitable Space'.

The reason for the change was to allow one and two-family dwellings to be built to the IRC when there are three habitable stories above a usable story, which is not habitable, but exists for the purpose of raising the house above the flood plain.

In the 2012 South Carolina Building Code statewide modifications, the 2006 modification of the definition of the word "Story" was not continued into the 2012 IRC modifications. Therefore all three story one and two-family dwellings elevated over parking are now considered four stories. Because it is now four stories it must be built out of the 2012 IBC, by a General Contractor and a fire sprinkler system installed. This change will also affect the Exception to Section R301.2.1.2 of the 2012 IRC. This exception allowed for the use of plywood panels in lieu of impact glass or approved storm shutters. The exception was for one and two-story single family buildings. Now a two-story building elevated over parking is a three story building thus eliminating the exception for a single family building with two stories elevated over parking. That building will have to have approved impact glazed openings or another approved impact opening protection system.