Default Heat Loss Coefficients

SECTION 1001 -- GENERAL

1001.1 Scope: The following defaults shall apply to Chapters 1 through 20. This chapter includes tables of seasonal average heat loss coefficients for specified nominal insulation. The heat loss coefficients may also be used for heating system sizing.

1001.2 Description: These coefficients were developed primarily from data and procedures from Standard RS-1, and taken specifically from Standard RS-2, listed in Chapter 7.

Coefficients not contained in this chapter may be computed using the procedures listed in these references if the assumptions in the following sections and Standard RS-2, listed in Chapter 7, are used, along with data from the sources referenced above.

1001.3 Air Films: Default R-values used for air films shall be as follows:

Reserved.

1001.4 Compression of Insulation: Insulation which is compressed shall be rated in accordance with Table 10-A or reduction in value may be calculated in accordance with the procedures in Standard RS-1, listed in Chapter 7.

1001.5 Building Materials: Default R-values used for building materials shall be as shown in Table 10-B.

TABLE 10-A - R-VALUE OF FIBERGLASS BATTS COMPRESSED WITHIN VARIOUS DEPTH CAVITIES

TABLE 10-B - DEFAULT R-VALUES FOR BUILDING MATERIALS

SECTION 1002 - BELOW-GRADE WALLS AND SLABS

1002.1 General: Table 10-1 lists heat loss coefficients for below-grade walls and floors.

Coefficients for below-grade walls are given as U-factors (Btu/h·ft² ·°F of wall area). Coefficients for below-grade slabs are listed as F-factors (Btu/h·ft·°F per lineal foot of slab perimeter).

Below-grade wall U-factors are only valid when used with the accompanying below-grade slab F-factor, and vice versa.

1002.2 Component Description: All below-grade walls are assumed to be 8 inch concrete. The wall is assumed to extend from the slab upward to the top of the mud sill for the distance specified in Table 10-1, with 6 inches of concrete wall extending above grade.

Interior insulation is assumed to be fiberglass batts placed in the cavity formed by 2x4 framing on 24 inch centers with 1/2 inch gypsum board as the interior finish material. Exterior insulation is assumed to be applied directly to the exterior of the below-grade wall from the top of the wall to the footing. The exterior case does not assume any interior framing or sheetrock.

In all cases, the entire wall surface is assumed to be insulated to the indicated nominal level with the appropriate framing and insulation application. Coefficients are listed for wall depths of 2, 3-1/2 and 7 feet below grade. Basements shallower than two feet should use on-grade slab coefficients.

Heat loss calculations for wall areas above grade should use above­grade wall U-factors beginning at the mudsill.

1002.3 Insulation Description: Coefficients are listed for the following four configurations:

1. Uninsulated: No insulation or interior finish.
2. Interior insulation: Interior 2x4 insulated wall without a thermal break between concrete wall and slab.
3. Interior insulation with thermal break: Interior 2x4 insulated wall with R­5 rigid board providing a thermal break between the concrete wall and the slab.
4. Exterior insulation: Insulation applied directly to the exterior surface of the concrete wall.

TABLE 10-1 - DEFAULT WALL U­FACTORS AND SLAB F­FACTORS FOR BASEMENTS

1003.1 General: Table 10-2 lists heat loss coefficients for heated on­grade slab floors, in units of Btu/°F·hr per lineal foot of perimeter.

1003.2 Component Description: All on­grade slab floors are assumed to be 6 inch concrete poured directly onto the earth. The bottom of the slab is assumed to be at grade line. Monolithic and floating slabs are not differentiated.

Soil is assumed to have a conductivity of 0.75 Btu/h·ft²·°F. Slabs 2 feet or more below grade should use basement coefficients.

1003.3 Insulation Description: Coefficients are provided for the following three configurations:

Two Foot (or four foot) vertical: Insulation is applied directly to the slab exterior, extending downward from the top of the slab to a depth of 2 feet (or 4 feet) below grade.

Two Foot (or four Foot) horizontal: Insulation is applied directly to the underside of the slab, and run horizontally from the perimeter inward for 2 feet (or 4 feet). The slab edge is exposed in this configuration.

Note: A horizontal installation with a thermal break of at least R­5 at the slab edge should use the vertical­-case F-factors.

Fully insulated slab: Insulation extends from the top of the slab, along the entire perimeter, and completely covers the area under the slab. Thicker perimeter insulation covers the slab edge and extends 2 feet under the slab.

TABLE 10-2 - DEFAULT F­-FACTORS FOR ON­-GRADE SLABS

1004.1 General: Tables 10-3, 10-4 and 10-4A list heat loss coefficients for floors over crawlspaces in units of Btu/h·ft²·°F of floor.

They are derived from procedures listed in Standard RS-1, listed in Chapter 7, assuming an average outdoor temperature of 45°F, an average indoor temperature of 65°F and a crawlspace area of 1350 ft² and 150 feet of perimeter. The crawlspace is assumed to be 2-1/2 feet high, with 24 inches below grade and 6 inches above grade.

1004.2 Crawlspace Description: Four configurations are considered: vented crawlspace, unvented crawlspace, heated plenum crawlspace and exposed floor.

Vented crawlspaces: Assumed to have 3 air changes per hour, with at least 1 ft² of net-­free ventilation in the foundation for every 300 ft² of crawlspace floor area. The crawlspace is not actively heated. Floors over unheated areas, such as garages, may only use those values which have R­-0 perimeter insulation.

Unvented crawlspaces: Assumed to have 1.5 air changes per hour, with less than 1 ft² of net-­free ventilation in the foundation for every 300 ft² of crawlspace floor area. The crawlspace is not actively heated. Floors over unheated basements may only use those values which have R­-0 perimeter insulation.

Heated­plenum crawlspaces: Assumed to have 0.25 air changes per hour, with no foundation vents. Heated supply air from central furnace is blown into a crawlspace and allowed to enter the living space unducted via holes cut into the floor.

Exposed floors: Assumes no buffer space, and a covering of 1/2 inch T1-­11 on the exterior of the cavity exposed to the outside air or rigid insulation below a concrete floor, such as over parking garages.

1004.3 Construction Description: Floors are assumed to be either joisted floors framed on 16 centers, or post and beam on 4 foot by 8 foot squares. Insulation is assumed to be installed under the subflooring between the joists or beams with no space between the insulation and the subfloor. Insulation is assumed to be uncompressed. Exposed floors also include concrete with continuous rigid insulation assumed.

Perimeter insulation is assumed to extend from the top of the rim joist to the crawlspace floor and then inward along the ground (on top of the ground cover) for at least 24 inches.

Floor coverings are assumed to be light carpet with rubber pad.

TABLE 10-3 - DEFAULT U-FACTORS FOR FLOORS OVER VENTED CRAWLSPACE OR UNHEATED BASEMENT

TABLE 10-4 - DEFAULT U-­FACTORS FOR FLOORS OVER HEATED PLENUM CRAWLSPACES

TABLE 10-4A - DEFAULT U-FACTORS FOR EXPOSED FLOORS

SECTION 1005 - ABOVE-GRADE WALLS

1005.1 General: Tables 10-5, 10-5A, and 10-5B list heat loss coefficients for the opaque portion of above­grade wood stud frame walls, metal stud frame walls and concrete masonry walls (Btu/h·ft²·°F) respecitvely. They are derived from procedures listed in Standard RS-1, listed in Chapter 7. For intermediate floor slabs which penetrate the insulated wall, use the concrete wall U-factors in Table 10-5B(1e).

Insulation is assumed to uniformly fill the entire cavity and to be installed as per manufacturer's directions. All walls are assumed to be finished on the inside with 1/2 inch gypsum wallboard, and on the outside with either beveled wood siding over 1/2 inch plywood sheathing or with 5/8 inch T1­11 siding. Insulated sheathing (either interior or exterior) is assumed to cover the entire opaque wall surface.

Metal building walls have a different construction and are addressed in Table 10-5A(3).

1005.2 Framing Description: For wood stud frame walls, three framing types are considered and defined as follows:

Standard: Studs framed on 16 inch centers with double top plate and single bottom plate. Corners use 3 studs and each opening is framed using 2 studs. Headers consist of double 2X or single 4X material with an air space left between the header and the exterior sheathing. Interior partition wall/exterior wall intersections use 2 studs in the exterior wall.

Intermediate: Studs framed on 16 inch centers with double top plate and single bottom plate. Corners use 2 studs or other means of fully insulating corners, and each opening is framed by 2 studs. Headers consist of double 2X material with R­10 insulation between the header and exterior sheathing. Interior partition wall/exterior wall intersections are fully insulated in the exterior wall.

Advanced: Studs framed on 24 inch centers with double top plate and single bottom plate. Corners use 2 studs or other means of fully insulating corners, and 1 stud is used to support each header. Headers consist of double 2X material with R­10 insulation between the header and exterior sheathing. Interior partition wall/exterior wall intersections are fully insulated in the exterior wall.

1005.3 Component Description: Default coefficients for four the following types of wall are listed: single­stud walls, metal stud walls, strap walls, and double­stud walls, log walls, stress-skin panels, metal stud walls, metal building walls.

Single­Stud Wall, Tables 10-5(1)-(8): Assumes either 2x4 or 2x6 studs framed on 16 or 24 inch centers. Headers are solid for 2x4 walls and double 2x for 2x6 walls, with either dead­air or rigid­board insulation in the remaining space.

Metal Stud Wall: Assumes metal studs spaced on 16 or 24 inch centers with insulation installed to fill wall cavities. Continuous rigid board insulation is applied without creating uninsulated voids in the remianing space.

Strap Wall, Table 10-5(9): Assumes 2x6 studs framed on 16 or 24 inch centers. 2x3 or 2x4 strapping is run horizontally along the interior surface of the wall to provide additional space for insulation.

Double­Stud Wall, Tables 10-5(10)-(11): Assumes an exterior structural wall and a separate interior, non­structural wall. Insulation is placed in both wall cavities and in the space between the two walls. Stud spacing is assumed to be on 24 inch centers for both walls.

Log Wall, Table 10-5(12).

Stress-Skin Panel, Table 10-5(13).

Metal Stud Wall, Overall Assembly U-Factors, Table 10-5A(1): Assumes metal studs spaced on 16 or 24 inch centers with insulation installed to fill wall cavities. Continuous rigid board insulation is applied without creating uninsulated voids in the wall assembly.

Metal Stud Wall, Effective R-Values for Metal Framing and Cavity Only, Table 10-5A(2): These values may be used for the metal-framing/cavity layer in walls metal studs spaced on 16 or 24 inch centers with insulation installed to fill wall cavities in lieu of using the zone method provided in Chapter 25 of Standard RS-1 listed in Chapter 7.

Metal Building Wall, Table 10-5A(3): A wall whose structure consists of metal spanning panels supported by steel structural members (does not include spandrel glass or metal panels in curtain wall systems). The first nominal R-value is for insulation compressed between metal wall panels and the steel structure. For double-layer installations, the second rated R-value of insulation is for insulation installed from the inside, covering the girts. For continuous insulation (e.g., insulation boards) it is assumed that the insulation boards are installed on the inside of the girts and uninterrupted by the framing members. Insulation exposed to the conditioned space or semiheated space shall have a facing, and all insulation seams shall be continuously sealed to provide a continuous air barrier.

Concrete Masonry, 8”, Table 10-5B(1a). Group R occupancy.

Concrete Masonry, 12”, Table 10-5B(1b). Group R occupancy.

Clay Brick, 8”, Table 10-5B(1c). Group R occupancy.

Concrete, 6” Poured or Precast, Table 10-5B(1d). Group R occupancy.

Peripheral Edges of Intermediate Concrete Floors, Table 10-5B(1e). Group R occupancy and other than Group R occupancy.

Concrete and Masonry Walls, Table 10-5B(2). Other than Group R occupancy.

TABLE 10-5 DEFAULT U-­FACTORS FOR ABOVE­-GRADE WALLS
(Select subtable from list below.)

TABLE 10-5(1) - DEFAULT U-­FACTORS FOR ABOVE­-GRADE WALLS: 2 x 4 Single Wood Stud with R-11 Batt

TABLE 10-5(2) - DEFAULT U-­FACTORS FOR ABOVE­-GRADE WALLS: 2 x 4 Single Wood Stud with R-13 Batt

TABLE 10-5(3) - DEFAULT U-­FACTORS FOR ABOVE­-GRADE WALLS: 2 x 4 Single Wood Stud with R-15 Batt

TABLE 10-5(4) - DEFAULT U-­FACTORS FOR ABOVE­-GRADE WALLS: 2 x 6 Single Wood Stud with R-19 Batt

TABLE 10-5(5) - DEFAULT U-­FACTORS FOR ABOVE­-GRADE WALLS: 2 x 6 Single Wood Stud with R-21 Batt

TABLE 10-5(6) - DEFAULT U-­FACTORS FOR ABOVE­-GRADE WALLS: 2 x 6 Single Wood Stud with R-22 Batt

TABLE 10-5(7) - DEFAULT U-­FACTORS FOR ABOVE­-GRADE WALLS: 2 x 6 Single Wood Stud with Two R-11 Batts

TABLE 10-5(8) - DEFAULT U-­FACTORS FOR ABOVE­-GRADE WALLS: 2 x 8 Single Wood Stud with R-25 Batt

TABLE 10-5(9) - DEFAULT U-­FACTORS FOR ABOVE­-GRADE WALLS: 2 x 6 Strap Wall with R-19 + R-11, or R-19 + R-8

TABLE 10-5(10) - DEFAULT U-­FACTORS FOR ABOVE­-GRADE WALLS: 2 x 6 + 2 x 4 Separated Double Wood Stud with Insulation Between

TABLE 10-5(11) - DEFAULT U-­FACTORS FOR ABOVE­-GRADE WALLS: 2 x 6 + 2 x 4 Separated Double Wood Stud with Insulation Between

TABLE 10-5(12) - DEFAULT U-­FACTORS FOR ABOVE­-GRADE WALLS: Log Walls

TABLE 10-5(13) - DEFAULT U-­FACTORS FOR ABOVE­-GRADE WALLS: Stress Skin Panel

TABLE 10-5A DEFAULT U-FACTORS FOR OVERALL ASSEMBLY METAL STUD WALLS, EFFECTIVE R-VALUES FOR METAL FRAMING AND CAVITY ONLY, AND DEFAULT METAL BUILDING U-FACTORS
(Select subtable from list below.)

TABLE 10-5A(1) - DEFAULT U-FACTORS FOR OVERALL ASSEMBLY METAL STUD WALLS

TABLE 10-5A(2) - EFFECTIVE R-VALUES FOR METAL FRAMING AND CAVITY ONLY 

TABLE 10-5A(3) - DEFAULT METAL BUILDING WALL U-FACTORS

TABLE 10-5B DEFAULT U-FACTORS FOR CONCRETE AND MASONRY WALLS
(Select subtable from list below.)

TABLE 10-5B(1a) - DEFAULT U-­FACTORS FOR CONCRETE AND MASONRY WALLS: Group R Occupancy, 8" Concrete Masonry

TABLE 10-5B(1b) - DEFAULT U-­FACTORS FOR CONCRETE AND MASONRY WALLS: Group R Occupancy, 12" Concrete Masonry

TABLE 10-5B(1c) - DEFAULT U-­FACTORS FOR CONCRETE AND MASONRY WALLS: Group R Occupancy, 8" Clay Brick

TABLE 10-5B(1d) - DEFAULT U-­FACTORS FOR CONCRETE AND MASONRY WALLS: Group R Occupancy, 6" Concrete Poured or Precast

TABLE 10-5B(1e) - DEFAULT U-­FACTORS FOR CONCRETE AND MASONRY WALLS: Group R Occupancy and Other than Group R Occupancy, Peripheral Edges of Intermediate Concrete Floors

TABLE 10-5B(2) - DEFAULT U-­FACTORS FOR CONCRETE AND MASONRY WALLS: Other than Group R Occupancy, Default U-Factors for Concrete and Masonry Walls

SECTION 1006 - DEFAULT U-FACTORS FOR GLAZING AND DOORS **CAM 403; Website NFRC **

1006.1 Glazing and Doors Without NFRC Certification: Glazing and doors that do not have NFRC Certification shall be assigned the following U-factors.

TABLE 10-6 - OTHER THAN GROUP R OCCUPANCY: DEFAULT U-FACTORS FOR VERTICAL GLAZING, OVERHEAD GLAZING AND OPAQUE DOORS **CAM 403; Website NFRC**

TABLE 10-6A - GROUP R OCCUPANCY: DEFAULT U-FACTORS FOR VERTICAL GLAZING **CAM 403; Website NFRC **

TABLE 10-6B - GROUP R OCCUPANCY: SMALL BUSINESSES COMPLIANCE TABLE FOR VERTICAL GLAZING¹
**CAM 403; Website NFRC**

TABLE 10-6C - GROUP R OCCUPANCY: DEFAULT U-FACTORS FOR DOORS
**CAM 403; Website NFRC**

TABLE 10-6D - GROUP R OCCUPANCY: DEFAULT U-FACTORS FOR GLAZED DOORS (See Table 10-6C)

TABLE 10-6E - GROUP R OCCUPANCY: DEFAULT U-FACTORS FOR OVERHEAD GLAZING
**CAM 403; Website NFRC**

SECTION 1007 - CEILINGS

1007.1 General: Table 10-7 lists heat loss coefficients for the opaque portion of exterior ceilings below vented attics, vaulted ceilings and roof decks in units of Btu/h·ft²·°F of ceiling.

They are derived from procedures listed in Standard RS-1, listed in Chapter 7. Ceiling U-­factors are modified for the buffering effect of the attic, assuming an indoor temperature of 65°F and an outdoor temperature of 45°F.

Metal Framed Ceilings: The nominal R-values in Table 10-5A(2): Effective R-Values for Metal Framing and Cavity Only may be used for purposes of calculating metal framed ceiling section U-­factors in lieu of the ASHRAE zone calculation method as provided in Chapter 25 of Standard RS-1.

Metal building roofs have a different construction and are addressed in Table 10-7(F).

1007.2 Component Description: The three types of ceilings are characterized as follows:

Ceilings Below a Vented Attic: Attic insulation is assumed to be blown­in, loose­fill fiberglass with a K-­value of 2.6 h·ft²· °F/Btu per inch. Full bag count for specified R­-value is assumed in all cases. Ceiling dimensions for flat ceiling calculations are 45 by 30 feet, with a gabled roof having a 4/12 pitch. The attic is assumed to vent naturally at the rate of 3 air changes per hour through soffit and ridge vents. A void fraction of 0.002 is assumed for all attics with insulation baffles. Standard framed, unbaffled attics assume a void fraction of 0.008.

Attic framing is either standard or advanced. Standard framing assumes tapering of insulation depth around the perimeter with resultant decrease in thermal resistance. An increased R­value is assumed in the center of the ceiling due to the effect of piling leftover insulation. Advanced framing assumes full and even depth of insulation extending to the outside edge of exterior walls. Advanced framing does not change from the default value.

U-factors for flat ceilings below vented attics with standard framing may be modified with the following table:

Vented scissors truss attics assume a ceiling pitch of 2/12 with a roof pitch of either 4/12 or 5/12. Unbaffled standard framed scissors truss attics are assumed to have a void fraction of 0.016.

Vaulted Ceilings: Insulation is assumed to be fiberglass batts installed in roof joist cavities. In the vented case, at least 1.5 inches between the top of the batts and the underside of the roof sheathing is left open for ventilation in each cavity. A ventilation rate of 3 air changes per hour is assumed. In the unvented or dense pack case, the ceiling cavity is assumed to be fully packed with insulation, leaving no space for ventilation.

Roof Decks: Rigid insulation is applied to the top of roof decking with no space left for ventilation. Roofing materials are attached directly on top of the insulation. Framing members are often left exposed on the interior side.

Metal Truss Framing: Overall system tested values for the roof/ceiling U_o for metal framed truss assemblies from approved laboratories shall be used, when such data is acceptable to the building official.

Alternatively, the U_o for roof/ceiling assemblies using metal truss framing may be obtained from Tables 10-7A, 10-7B, 10-7C, 10-7D, and 10-7E.

Steel Truss Framed Ceiling, Table 10-7A.

Steel Truss Framed Ceiling with R-3 Sheathing, Table 10-7B.

Steel Truss Framed Ceiling with R-5 Sheathing, Table 10-7C.

Steel Truss Framed Ceiling with R-10 Sheathing, Table 10-7D.

Steel Truss Framed Ceiling with R-15 Sheathing, Table 10-7E.

Metal Building Roof, Table 10-7F: the base assembly is a roof where the insulation is draped over the steel structure (purlins) and then compressed when the metal roof panels are attached to the steel structure (purlins). Additional assemblies include continuous insulation, uncompressed and uninterrupted by framing.

The first nominal R-value is for insulation draped over purlins and then compressed when the metal roof panels are attached, or for insulation hung between the purlins. A minimum 1 in. R-5 thermal spacer block between the purlins and the metal roof panels is required when specified in Table 10-7F.

For double-layer installations, the second nominal R-value is for insulation installed parallel to the purlins.

For continuous insulation (e.g., insulation boards or blankets), it is assumed that the insulation is installed below the purlins and is uninterrupted by framing members. Insulation exposed to the conditioned space or semiheated space shall have a facing, and all insulation seams shall be continuously sealed to provide a continuous air barrier.

Roofs with Insulation Entirely Above Deck (uninterrupted by framing), Table 10-7G: the base assembly is continuous insulation over a structural deck. Added insulation is continuous and uninterrupted by framing. For the insulation, the first column lists the R-value for continuous insulation with a uniform thickness; the second column lists the comparable area-weighted average R-value for continuous insulation provided that the insulation thickness is never less than R-5 (except at roof drains) and that the slope is no greater than ¼ inch per foot.

TABLE 10-7 - DEFAULT U-­FACTORS FOR CEILINGS

Table 10-7A - STEEL TRUSS¹ FRAMED CEILING U_o

Table 10-7B - STEEL TRUSS¹ FRAMED CEILING U_o: with R-3 Sheathing²

Table 10-7C - STEEL TRUSS¹ FRAMED CEILING U_o: with R-5 Sheathing²

Table 10-7D - STEEL TRUSS¹ FRAMED CEILING U_o: with R-10 Sheathing²

Table 10-7E - STEEL TRUSS¹ FRAMED CEILING U_o: with R-15 Sheathing²

Table 10-7F - DEFAULT METAL BUILDING ROOF U-FACTORS

Table 10-7G - ASSEMBLY U-FACTORS FOR ROOFS WITH INSULATION ENTIRELY ABOVE DECK (UNINTERRUPTED BY FRAMING)

1008.1 General: Tables 10-8 and 10-8A list effective air change rates and heat capacities for heat loss due to infiltration for Group R Occupancy.

The estimated seasonal average infiltration rate in air changes per hour (ACH) is given for standard air­leakage control (see Section 502.4 of this Code for air leakage requirements). The effective air change rate shall be used in calculations for compliance under either the Component Performance or Systems Analysis approaches.

Heat loss due to infiltration shall be computed using the following equation:

TABLE 10-8 - ASSUMED EFFECTIVE AIR CHANGES PER HOUR

TABLE 10-8A - DEFAULT HEAT CAPACITY/DENSITY PRODUCT FOR AIR

SECTION 1009 - MASS

1009.1 General: Tables 10-9 and 10-10 list default mass­values for concrete masonry construction. Calculations are based on standard ASHRAE values for heat­storage capacity as listed in Standard RS-1, Chapter 25.

Thermal capacity of furniture is ignored, as is heat storage beyond the first 4 inches of mass thickness. All mass is assumed to be in direct contact with the conditioned space. Concrete separated from the heated volume by other materials must multiply the listed concrete mass value by the result of the following formula:

Ln(R­value) x (­0.221)+ 0.5

Where:

Ln = Natural log

R­value = R­value of material covering concrete

Note: All default values for covered concrete slabs have been adjusted according to this procedure.

1009.2 Mass Description: Mass is divided into two types: structural and additional.

Structural Mass: Includes heat­storage capacity of all standard building components of a typical residential structure, including floors, ceilings and interior and exterior walls in Btu/ft²·°F of floor area. It also assumes exterior wall, interior wall and ceiling surface area approximately equals three times the floor area.

Additional Mass: Includes any additional building material not part of the normal structure, which is added specifically to increase the building's thermal­storage capability. This category includes masonry fireplaces, water or trombe walls and extra layers of sheetrock. Coefficients are in Btu/ft²·°F of surface area of material exposed to conditioned space. The coefficient for water is Btu/°F·gallon.

1009.3 Component Description: Light frame assumes 1 inch thick wood flooring with 5/8-inch sheetrock on ceilings and interior walls, and walls consisting of either 5/8-inch sheetrock or solid logs. Slab assumes a 4 inch concrete slab on or below grade, with 5/8-inch sheetrock on exterior and interior walls and ceiling, and with separate values for interior or exterior wall insulation. Adjustments for slab covering is based on R­value of material. Additional mass values are based on the density multiplied by the specific heat of the material adjusted for listed thickness.

TABLE 10-9 - HEAT CAPACITY

TABLE 10-10 - DEFAULT MASS VALUES

LIST OF TABLES IN CHAPTER 10

TABLE 10-A - R-VALUE OF FIBERGLASS BATTS COMPRESSED WITHIN VARIOUS DEPTH CAVITIES

TABLE 10-B - DEFAULT R-VALUES FOR BUILDING MATERIALS

TABLE 10-1 - DEFAULT WALL U­-FACTORS AND SLAB F­-FACTORS FOR BASEMENTS

TABLE 10-2 - DEFAULT F­-FACTORS FOR ON­-GRADE SLABS

TABLE 10-3 - DEFAULT U-FACTORS FOR FLOORS OVER VENTED CRAWLSPACE OR UNHEATED BASEMENT

TABLE 10-4 - DEFAULT U-­FACTORS FOR FLOORS OVER HEATED PLENUM CRAWLSPACES

TABLE 10-4A - DEFAULT U-FACTORS FOR EXPOSED FLOORS

TABLE 10-5 DEFAULT U-­FACTORS FOR ABOVE­-GRADE WALLS
(Select subtable from list below.)

TABLE 10-5(1) - DEFAULT U-­FACTORS FOR ABOVE­-GRADE WALLS: 2 x 4 Single Wood Stud with R-11 Batt

TABLE 10-5(2) - DEFAULT U-­FACTORS FOR ABOVE­-GRADE WALLS: 2 x 4 Single Wood Stud with R-13 Batt

TABLE 10-5(3) - DEFAULT U-­FACTORS FOR ABOVE­-GRADE WALLS: 2 x 4 Single Wood Stud with R-15 Batt

TABLE 10-5(4) - DEFAULT U-­FACTORS FOR ABOVE­-GRADE WALLS: 2 x 6 Single Wood Stud with R-19 Batt

TABLE 10-5(5) - DEFAULT U-­FACTORS FOR ABOVE­-GRADE WALLS: 2 x 6 Single Wood Stud with R-21 Batt

TABLE 10-5(6) - DEFAULT U-­FACTORS FOR ABOVE­-GRADE WALLS: 2 x 6 Single Wood Stud with R-22 Batt

TABLE 10-5(7) - DEFAULT U-­FACTORS FOR ABOVE­-GRADE WALLS: 2 x 6 Single Wood Stud with Two R-11 Batts

TABLE 10-5(8) - DEFAULT U-­FACTORS FOR ABOVE­-GRADE WALLS: 2 x 8 Single Wood Stud with R-25 Batt

TABLE 10-5(9) - DEFAULT U-­FACTORS FOR ABOVE­-GRADE WALLS: 2 x 6 Strap Wall with R-19 + R-11, or R-19 + R-8

TABLE 10-5(10) - DEFAULT U-­FACTORS FOR ABOVE­-GRADE WALLS: 2 x 6 + 2 x 4 Separated Double Wood Stud with Insulation Between

TABLE 10-5(11) - DEFAULT U-­FACTORS FOR ABOVE­-GRADE WALLS: 2 x 6 + 2 x 4 Separated Double Wood Stud with Insulation Between

TABLE 10-5(12) - DEFAULT U-­FACTORS FOR ABOVE­-GRADE WALLS: Log Walls

TABLE 10-5(13) - DEFAULT U-­FACTORS FOR ABOVE­-GRADE WALLS: Stress Skin Panel

TABLE 10-5A DEFAULT U-FACTORS FOR OVERALL ASSEMBLY METAL STUD WALLS, EFFECTIVE R-VALUES FOR METAL FRAMING AND CAVITY ONLY, AND DEFAULT METAL BUILDING U-FACTORS
(Select subtable from list below.)

TABLE 10-5A(1) - DEFAULT U-FACTORS FOR OVERALL ASSEMBLY METAL STUD WALLS

TABLE 10-5A(2) - EFFECTIVE R-VALUES FOR METAL FRAMING AND CAVITY ONLY 

TABLE 10-5A(3) - DEFAULT METAL BUILDING WALL U-FACTORS

TABLE 10-5B DEFAULT U-FACTORS FOR CONCRETE AND MASONRY WALLS
(Select subtable from list below.)

TABLE 10-5B(1a) - DEFAULT U-­FACTORS FOR CONCRETE AND MASONRY WALLS: Group R Occupancy, 8" Concrete Masonry

TABLE 10-5B(1b) - DEFAULT U-­FACTORS FOR CONCRETE AND MASONRY WALLS: Group R Occupancy, 12" Concrete Masonry

TABLE 10-5B(1c) - DEFAULT U-­FACTORS FOR CONCRETE AND MASONRY WALLS: Group R Occupancy, 8" Clay Brick

TABLE 10-5B(1d) - DEFAULT U-­FACTORS FOR CONCRETE AND MASONRY WALLS: Group R Occupancy, 6" Concrete Poured or Precast

TABLE 10-5B(1e) - DEFAULT U-­FACTORS FOR CONCRETE AND MASONRY WALLS: Group R Occupancy and Other than Group R Occupancy, Peripheral Edges of Intermediate Concrete Floors

TABLE 10-5B(2) - DEFAULT U-­FACTORS FOR CONCRETE AND MASONRY WALLS: Other than Group R Occupancy, Default U-Factors for Concrete and Masonry Walls

TABLE 10-6 - OTHER THAN GROUP R OCCUPANCY: DEFAULT U-FACTORS FOR VERTICAL GLAZING, OVERHEAD GLAZING AND OPAQUE DOORS **CAM 403; Website NFRC**

TABLE 10-6A - GROUP R OCCUPANCY: DEFAULT U-FACTORS FOR VERTICAL GLAZING **CAM 403; Website NFRC **

TABLE 10-6B - GROUP R OCCUPANCY: SMALL BUSINESSES COMPLIANCE TABLE FOR VERTICAL GLAZING¹
**CAM 403; Website NFRC**

TABLE 10-6C - GROUP R OCCUPANCY: DEFAULT U-FACTORS FOR DOORS
**CAM 403; Website NFRC**

TABLE 10-6D - GROUP R OCCUPANCY: DEFAULT U-FACTORS FOR GLAZED DOORS (See Table 10-6C)

TABLE 10-6E - GROUP R OCCUPANCY: DEFAULT U-FACTORS FOR OVERHEAD GLAZING
**CAM 403; Website NFRC**

TABLE 10-7 - DEFAULT U-­FACTORS FOR CEILINGS

Table 10-7A - STEEL TRUSS¹ FRAMED CEILING U_o

Table 10-7B - STEEL TRUSS¹ FRAMED CEILING U_o: with R-3 Sheathing²

Table 10-7C - STEEL TRUSS¹ FRAMED CEILING U_o: with R-5 Sheathing²

Table 10-7D - STEEL TRUSS¹ FRAMED CEILING U_o: with R-10 Sheathing²

Table 10-7E - STEEL TRUSS¹ FRAMED CEILING U_o: with R-15 Sheathing²

Table 10-7F - DEFAULT METAL BUILDING ROOF U-FACTORS

Table 10-7G - ASSEMBLY U-FACTORS FOR ROOFS WITH INSULATION ENTIRELY ABOVE DECK (UNINTERRUPTED BY FRAMING)

TABLE 10-8 - ASSUMED EFFECTIVE AIR CHANGES PER HOUR

TABLE 10-8A - DEFAULT HEAT CAPACITY/DENSITY PRODUCT FOR AIR

TABLE 10-9 - HEAT CAPACITY

TABLE 10-10 - DEFAULT MASS VALUES