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301.1 General

AMENDMENT
This section has been amended at the state or city level.
Climate zones from Figure 301.1 or Table 301.1 shall be used in determining the applicable requirements from Chapters 4 and 5.

FIGURE 301.1
NORTH CAROLINA CLIMATE ZONES


TABLE 301.1
NORTH CAROLINA CLIMATE ZONES, MOISTURE REGIMES, AND WARM-HUMID DESIGNATIONS BY COUNTY
Key: A — Moist, B — Dry, C — Marine. Absence of moisture designation indicates moisture regime is        irrelevant. Asterisk (*) indicates a warm-humid location.
NORTH
CAROLINA
4A Alamance 4A Cleveland 4A Henderson 3A Onslow* 3A Tyrrell
4A Alexander 3A Columbus* 4A Hertford 4A Orange 3A Union
5A Alleghany 3A Craven 3A Hoke 3A Pamlico 4A Vance
3A Anson 3A Cumberland 3A Hyde 3A Pasquotank 4A Wake
5A Ashe 3A Currituck 4A Iredell 3A Pender* 4A Warren
5A Avery 3A Dare 4A Jackson 3A Perquimans 3A Washington
3A Beaufort 3A Davidson 3A Johnston 4A Person 5A Watauga
4A Bertie 4A Davie 3A Jones 3A Pitt 3A Wayne
3A Bladen 3A Duplin 4A Lee 4A Polk 4A Wilkes
3A Brunswick* 4A Durham 3A Lenoir 3A Randolph 3A Wilson
4A Buncombe 3A Edgecombe 4A Lincoln 3A Richmond 4A Yadkin
4A Burke 4A Forsyth 4A Macon 3A Robeson 5A Yancey
3A Cabarrus 4A Franklin 4A Madison 4A Rockingham
4A Caldwell 3A Gaston 3A Martin 3A Rowan
3A Camden 4A Gates 4A McDowell 4A Rutherford
3A Carteret* 4A Graham 3A Mecklenburg 3A Sampson
4A Caswell 4A Granville 5A Mitchell 3A Scotland
4A Catawba 3A Greene 3A Montgomery 3A Stanly
4A Chatham 4A Guilford 3A Moore 4A Stokes
4A Cherokee 4A Halifax 4A Nash 4A Surry
3A Chowan 4A Harnett 3A New Hanover* 4A Swain
4A Clay 4A Haywood 4A Northampton 4A Transylvania

301.2 Warm Humid Counties

AMENDMENT
This section has been amended at the state or city level.
Warm humid counties are identified in Table 301.1 by an asterisk.

301.3 International Climate Zones

AMENDMENT
This section has been amended at the state or city level.
The interior design temperatures used for heating and cooling load calculations shall be a maximum of 72°F (22°C) for heating and minimum of 75°F (24°C) for cooling.
Materials, systems and equipment shall be identified in a manner that will allow a determination of compliance with the applicable provisions of this code.
An R-value identification mark shall be applied by the manufacturer to each piece of building thermal envelope insulation 12 inches (305 mm) or greater in width. Alternately, the insulation installers shall provide a certification listing the type, manufacturer and R-value of insulation installed in each element of the building thermal envelope. For blown or sprayed insulation (fiberglass and cellulose), the initial installed thickness, settled thickness, settled R-value, installed density, coverage area and number of bags installed shall be listed on the certification. For sprayed polyurethane foam (SPF) insulation, the installed thickness of the areas covered and R-value of installed thickness shall be listed on the certification. The insulation installer shall sign, date and post the certification in a conspicuous location on the job site.
The thickness of blown-in or sprayed roof/ceiling insulation (fiberglass or cellulose) shall be written in inches (mm) on markers that are installed at least one for every 300 square feet (28 m2) throughout the attic space. The markers shall be affixed to the trusses or joists and marked with the minimum initial installed thickness with numbers a minimum of 1 inch (25 mm) in height. Each marker shall face the attic access opening. Spray polyurethane foam thickness and installed R-value shall be listed on certification provided by the insulation installer.
Insulating materials shall be installed such that the manufacturer's R-value mark is readily observable upon inspection.

303.1.3 Fenestration Product Rating

AMENDMENT
This section has been amended at the state or city level.

U-factors of fenestration products (windows, doors and skylights) shall be determined in accordance with NFRC 100 by an accredited (by a body such as IAS or NFRC), independent laboratory, and labeled and certified by the manufacturer. Products lacking such a labeled U-factor shall be assigned a default U-factor from Table 303.1.3(1) or 303.1.3(2). The solar heat gain coefficient (SHGC) of glazed fenestration products (windows, glazed doors and skylights) shall be determined in accordance with NFRC 200 by an accredited, independent laboratory, and labeled and certified by the manufacturer. Products lacking such a labeled SHGC shall be assigned a default SHGC from Table 303.1.3(3).

TABLE 303.1.3(1)
DEFAULT GLAZED FENESTRATION U-FACTOR

FRAME TYPE

SINGLE PANE

DOUBLE PANE

SKYLIGHT

Single

Double

Metal

1.20

0.80

2.00

1.30

Metal with Thermal Break

1.10

0.65

1.90

1.10

Nonmetal or Metal Clad

0.95

0.55

1.75

1.05

Glazed Block

0.60

TABLE 303.1.3(2)
DEFAULT DOOR U-FACTORS

DOOR TYPE

U-FACTOR

Uninsulated Metal

1.20

Insulated Metal

0.60

Wood

0.50

Insulated, nonmetal edge, max 45% glazing, any glazing double pane

0.35

TABLE 303.1.3(3)
DEFAULT GLAZED FENESTRATION SHGC

SINGLE GLAZED

DOUBLE GLAZED

GLAZED BLOCK

Clear

Tinted

Clear

Tinted

0.8

0.7

0.7

0.6

0.6

The thermal resistance (R-value) of insulation shall be determined in accordance with the U.S. Federal Trade Commission R-value rule (CFR Title 16, Part 460, May 31, 2005) in units of h × ft2 × °F/Btu at a mean temperature of 75°F (24°C).
All materials, systems and equipment shall be installed in accordance with the manufacturer's installation instructions and the International Building Code.
Insulation applied to the exterior of basement walls, crawlspace walls and the perimeter of slab-on-grade floors shall have a rigid, opaque and weather-resistant protective covering to prevent the degradation of the insulation's thermal performance. The protective covering shall cover the exposed exterior insulation and extend a minimum of 6 inches (153 mm) below grade.

303.3 Maintenance Information

AMENDMENT
This section has been amended at the state or city level.
Maintenance instructions shall be furnished for equipment and systems that require preventive maintenance. Required regular maintenance actions shall be stated and incorporated on a readily accessible label. The label shall include the title or publication number for the operation and maintenance manual for that particular model and type of product.
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