6.9 Conditioned Zones
The compliance software requires the user to enter the characteristics of one or more conditioned zones. Subdividing dwelling units into conditioned zones for input convenience or increased accuracy is optional.
6.9.1 Zone Type
PROPOSED DESIGN
The zone is defined as conditioned versus unconditioned, dwelling unit, common, attic, and crawl spaces.
STANDARD DESIGN
The standard design is conditioned.
VERIFICATION AND REPORTING
When the zone type is living or sleeping, this is reported as a special feature on the LMCC or NRCC.
Heating Zonal Control Credit
With the heating zonal control credit, the sleeping and living areas are modeled separately for heating, each with its own separate thermostat schedule and internal gain assumptions. Zonal control cannot be modeled with heat pump heating. The total non-closable opening area between zones cannot exceed 40 ft2. Other eligibility criteria for this measure are presented in the Nonresidential Compliance Manual, Chapter 4.
PROPOSED DESIGN
The user selects zonal control as a building level input with separate living and sleeping zones.
STANDARD DESIGN
The standard design building is not zoned for living and sleeping separately.
VERIFICATION AND REPORTING
Zonal control is reported as a special feature on the LMCC or NRCC.
6.9.2 Conditioned Floor Area
The total conditioned floor area (CFA) is the raised floor as well as the slab-on-grade floor area of the conditioned spaces measured from the exterior surface of exterior walls. Stairs are included in conditioned floor area as the area beneath the stairs and the tread of the stairs.
PROPOSED DESIGN
The compliance software requires the user to enter the total conditioned floor area of each conditioned zone.
STANDARD DESIGN
The standard design building has the same conditioned floor area and same conditioned zones as the proposed design.
VERIFICATION AND REPORTING
The conditioned floor area of each conditioned zone is reported on the LMCC or NRCC.
6.9.3 Number of Stories
Number of Stories of the Zone
PROPOSED DESIGN
The number of stories of the zone.
STANDARD DESIGN
The standard design is the same as the proposed design.
Ceiling Height
PROPOSED DESIGN
The average ceiling height of the proposed design is the conditioned volume of the building envelope. The volume (in cubic feet) is determined from the total conditioned floor area and the average ceiling height.
STANDARD DESIGN
The volume of the standard design building is the same as the proposed design.
VERIFICATION AND REPORTING
The conditioned volume of each zone is reported on the LMCC or NRCC.
Free Ventilation Area
Free ventilation area is the window area adjusted to account for bug screens, window framing and dividers, and other factors.
PROPOSED DESIGN
Free ventilation area for the proposed design is calculated as 5 percent of the fenestration area (rough opening), assuming all windows are operable.
STANDARD DESIGN
The standard design value for free ventilation area is the same as the proposed design.
VERIFICATION AND REPORTING
Free ventilation is not reported on the LMCC or NRCC.
Ventilation Height Difference
Ventilation height difference is not a user input.
PROPOSED DESIGN
The default assumption for the proposed design is 2 feet for one-story buildings or one-story dwelling units and 8 feet for two or more stories (as derived from number of stories and other zone details).
STANDARD DESIGN
The standard design modeling assumption for the elevation difference between the inlet and the outlet is 2 feet for one-story dwelling units and 8 feet for two or more stories.
Zone Elevations
The elevation of the top and bottom of each zone is required to set up the airflow network.
PROPOSED DESIGN
The user enters the height of the top surface the lowest floor of the zone relative to the ground outside as the “bottom” of the zone. The user also enters the ceiling height (the floor-to-floor height [ceiling height plus the thickness of the intermediate floor structure] is calculated by the compliance software).
Underground zones are indicated with the number of feet below grade (e.g., -8).
STANDARD DESIGN
The standard design has the same vertical zone dimensions as the proposed design.
Mechanical Systems
PROPOSED DESIGN
The compliance software requires the user to specify a previously defined HVAC system to provide heating and cooling for the zone and an IAQ ventilation system. The user may also specify a ventilation cooling system that applies to this and other conditioned zones.
STANDARD DESIGN
The compliance software assigns standard design HVAC, IAQ ventilation, and ventilation cooling systems based on §170.2 and Table 170.2-K for the applicable climate zone.
Natural Ventilation
Natural ventilation (from windows) is available in dwelling units during cooling mode when needed and available, as shown in Table 41. The amount of natural ventilation used by computer compliance software for natural cooling is the lesser of the maximum potential amount available and the amount needed to drive the interior zone temperature down to the natural cooling setpoint. When natural cooling is not needed or is unavailable, no natural ventilation is used.
Computer compliance software shall assume that natural cooling is needed when the building is in “cooling mode,” when the outside temperature is below the estimated zone temperature, and when the estimated zone temperature is above the natural cooling setpoint temperature. Only the amount of ventilation required to reduce the zone temperature to the natural ventilation setpoint temperature is used, and the natural ventilation setpoint temperature is constrained by the compliance software to be greater than the heating setpoint temperature.
Table 41: Hourly Thermostat Set Points
Hour | Cooling | Venting | Heat Pump Heating | Standard Gas Heating Single-Zone | Zonal Control Gas Heating Living | Zonal Control Gas Heating Sleeping |
1 | 78 | Off | 68 | 65 | 65 | 65 |
2 | 78 | Off | 68 | 65 | 65 | 65 |
3 | 78 | Off | 68 | 65 | 65 | 65 |
4 | 78 | Off | 68 | 65 | 65 | 65 |
5 | 78 | Off | 68 | 65 | 65 | 65 |
6 | 78 | 68* | 68 | 65 | 65 | 65 |
7 | 78 | 68 | 68 | 65 | 65 | 65 |
8 | 78 | 68 | 68 | 68 | 68 | 68 |
9 | 78 | 68 | 68 | 68 | 68 | 68 |
10 | 78 | 68 | 68 | 68 | 68 | 65 |
11 | 78 | 68 | 68 | 68 | 68 | 65 |
12 | 78 | 68 | 68 | 68 | 68 | 65 |
13 | 78 | 68 | 68 | 68 | 68 | 65 |
14 | 78 | 68 | 68 | 68 | 68 | 65 |
15 | 78 | 68 | 68 | 68 | 68 | 65 |
16 | 78 | 68 | 68 | 68 | 68 | 65 |
17 | 78 | 68 | 68 | 68 | 68 | 68 |
18 | 78 | 68 | 68 | 68 | 68 | 68 |
19 | 78 | 68 | 68 | 68 | 68 | 68 |
20 | 78 | 68 | 68 | 68 | 68 | 68 |
21 | 78 | 68 | 68 | 68 | 68 | 68 |
22 | 78 | 68 | 68 | 68 | 68 | 68 |
23 | 78 | 68 | 68 | 68 | 68 | 68 |
24 | 78 | Off | 68 | 65 | 65 | 65 |
*Venting starts in the hour the sun comes up.
Source: California Energy Commission
6.9.4 Conditioned Zone Assumptions
Internal Thermal Mass
Internal mass objects are completely inside a zone so that they do not participate directly in heat flows to other zones or outside. They are connected to the zone radiantly and convectively and participate in the zone energy balance by passively storing and releasing heat as conditions change.
Table 42 shows the standard interior conditioned zone thermal mass objects and the calculation of the simulation inputs that represent them.
Table 42: Conditioned Zone Thermal Mass Objects
Item | Description | Simulation Object |
Interior walls | The area of one side of the walls completely inside the conditioned zone is calculated as the conditioned floor area of the zone minus ½ of the area of interior walls adjacent to other conditioned zones. The interior wall is modeled as a construction with 25 percent 2x4 wood framing and sheetrock on both sides. | Wall exposed to the zone on both sides |
Interior floors | The area of floors completely inside the conditioned zone is calculated as the difference between the CFA of the zone and the sum of the areas of zone exterior floors and interior floors over other zones. Interior floors are modeled as a surface inside the zone with a construction of carpet, wood decking, 2x12 framing at 16 in. on-center with miscellaneous bridging, electrical, and plumbing, and a sheetrock ceiling below. | Floor/ceiling surface exposed to the zone on both sides |
Furniture and heavy contents | Contents of the conditioned zone with significant heat storage capacity and delayed thermal response, for example heavy furniture, bottled drinks, canned goods, contents of dressers, enclosed cabinets. These are represented by a 2 in. thick slab of wood twice as large as the conditioned floor area, exposed to the room on both sides. | Horizontal wood slab exposed to the zone on both sides |
Light and thin contents | Contents of the conditioned zone that have a large surface area compared to weight, for example, clothing on hangers, curtains, pots, and pans. These are assumed to be 2 Btu per square foot of conditioned floor area. | Air heat capacity (Cair ) = CFA * 2 |
Source: California Energy Commission
PROPOSED DESIGN
The proposed design has standard conditioned zone thermal mass objects (such as gypsum board in walls, cabinets, sinks, and tubs) that are not user-editable and are not a compliance variable. If the proposed design includes specific interior thermal mass elements that are significantly different from what is included in typical wood-frame production housing, such as masonry partition walls, the user may include them. See also Chapter 6.10.6.4 Exterior Thermal Mass.
STANDARD DESIGN
The standard design has standard conditioned zone thermal mass objects.
Thermostats and Schedules
Thermostat settings are shown in Table 36. The values for cooling, venting, and standard heating apply to the standard design run and are the default for the proposed design run. See the explanation later in this chapter regarding the values for zonal control.
Heat pumps equipped with supplementary electric resistance heating are assumed to meet mandatory control requirements specified in §110.2(b) and 110.2(c).
Systems with no setback required by §110.2(c) (gravity gas wall heaters, gravity floor heaters, gravity room heaters, noncentral electric heaters, fireplaces or decorative gas appliances, wood stoves, room air-conditioners, and room air-conditioner heat pumps) are assumed to have a constant heating set point of 68 degrees Fahrenheit. The cooling set point from Table 36 is assumed in both the proposed design and standard design.
PROPOSED DESIGN
The proposed design assumes a mandatory setback thermostat meeting the requirements of §110.2(c). Systems exempt from the requirement for a setback thermostat are assumed to have no setback capabilities.
STANDARD DESIGN
The standard design has setback thermostat conditions based on the mandatory requirement for a setback thermostat. For equipment exempt from the setback thermostat requirement, the standard design has no setback thermostat capabilities.
Determining Heating Mode vs. Cooling Mode
When the building is in the heating mode, the heating setpoints for each hour are set to the “heating” values in Table 36, the cooling setpoint is a constant 78 degrees Fahrenheit (°F), and the ventilation setpoint is set to a constant 77°F. When the building is in the cooling mode, the heating setpoint is a constant 60°F, and the cooling and venting setpoints are set to the values in Table 36.
The mode depends upon the outdoor temperature averaged over hours 1 through 24 of eight days prior to the current day through two days prior to the current day. (For example, if the current day is June 21, the mode is based on the average temperature for June 13 through 20.) When this running average temperature is equal to or less than 60°F, the building is in a heating mode. When the running average is greater than 60°F, the building is in a cooling mode.
6.9.5 Internal Gains
Internal gains assumptions are included in Appendix E and consistent with the CASE report on plug loads and lighting (Rubin 2016, see Appendix F). The internal gains assumptions for the standard design building is the same as the proposed design.
6.9.6 Exterior Surfaces
The user enters exterior surfaces to define the envelope of the proposed design. The areas, construction assemblies, orientations, and tilts modeled are consistent with the actual building design and shall equal the overall roof/ceiling area with conditioned space on the inside and unconditioned space on the other side.
Ceilings Below Attics
Ceilings below attics are horizontal surfaces between conditioned zones and attics. The area of the attic floor is determined by the total area of ceilings below attics defined in conditioned zones.
PROPOSED DESIGN
The compliance software allows the user to define ceilings below attic, enter the area, and select a construction assembly for each.
STANDARD DESIGN
The standard design for newly constructed buildings has the same ceiling below attic area as the proposed design. The standard design is a high-performance attic with a ceiling constructed with 2x4 framed trusses and insulated with the R-values specified in §170.2 and Table 170.2-A for the applicable climate zone. The roof surface is a 10 lbs/ft2 tile roof with an air space when the proposed roof is steep slope or a lightweight roof when the proposed roof is low slope.
Multifamily dwelling units: Below roof-deck insulation has R-0 in Climate Zones 1-3 and 5-7, R-13 in Climate Zones 10 and 16, and R-19 in Climate Zones 4, 8, 9 and 11-15. Insulation on the ceiling has R-38 in Climate Zones 1, 2, 4 and 8-16, and R-30 insulation on the ceiling in Climate Zones 3 and 5-7. Climate Zones 2, 3, and 5-7 have a radiant barrier, and Climate Zones 1, 4, and 8-16 have no radiant barrier.
VERIFICATION AND REPORTING
Ceiling below attic area and constructions are reported on the LMCC or NRCC. SIP assemblies are reported as a special feature on the LMCC or NRCC.
Non-Attic (Cathedral) Ceiling and Roof
Non-attic ceilings, also known as cathedral ceilings, are surfaces with roofing on the outside and finished ceiling on the inside but without an attic space.
PROPOSED DESIGN
The compliance software allows the user to define cathedral ceilings, enter the area, and select a construction assembly for each. The user also enters the roof characteristics of the surface.
STANDARD DESIGN
The standard design has the same area as the proposed design cathedral ceiling modeled as ceiling below attic with the features from §170.2 and Table 170.2-A or for the applicable climate zone.
The standard design building has an area of ceiling below attic equal to the non-attic ceiling/roof areas of the proposed design. The standard design roof and ceiling surfaces are modeled with the same construction assembly and characteristics, aged reflectance, and emittance as §170.2, Table 170.2-A for the applicable climate zone.
VERIFICATION AND REPORTING
Non-attic ceiling/roof area and constructions are reported on the LMCC. SIP assemblies are reported as a special feature on the LMCC.
Exterior Walls
PROPOSED DESIGN
The compliance software allows the user to define walls, enter the gross area, and select a construction assembly for each. The user also enters the plan orientation (front, left, back, or right) or plan azimuth (value relative to the front, which is represented as zero degrees) and tilt of the wall.
The wall areas modeled are consistent with the actual building design, and the total wall area is equal to the gross wall area with conditioned space on the inside and unconditioned space or exterior conditions on the other side. Underground mass walls are defined with inside and outside insulation and the number of feet below grade. Walls adjacent to unconditioned spaces with no solar gains (such as knee walls or garage walls) are entered as an interior wall with the zone on the other side specified as attic, garage, or another zone, and the compliance manager treats that wall as a demising wall. An attached unconditioned space is modeled as an unconditioned zone.
STANDARD DESIGN
The standard design building has high-performance walls modeled with the same area of framed walls as is in the proposed design separating conditioned space and the exterior, with a U-factor equivalent to that as specified in §170.2 and Table 170.2-A for the applicable climate zone, wall assembly type, and required fire rating.
The total gross exterior wall area in the standard design is equal to the total gross exterior wall area of the proposed design for each wall type and for each orientation. Window and door areas are subtracted from the gross wall area to determine the net wall area in each orientation.
VERIFICATION AND REPORTING
Exterior wall area and construction details are reported on the LMCC. Metal-framed and SIP assemblies are reported as a special feature on the LMCC.
Exterior Thermal Mass
Constructions for standard exterior mass are supported but not implemented beyond the assumptions for typical mass.
The performance approach assumes that both the proposed design and standard design building have a minimum mass as a function of the conditioned area of slab floor and non-slab-floor. (See Chapter 6.10.4.1 Internal Thermal Mass.)
Mass such as concrete slab floors, masonry walls, double gypsum board, and other special mass elements can be modeled. When the proposed design has more than the typical assumptions for mass in a building, then each element of heavy mass is modeled in the proposed design, otherwise; the proposed design is modeled with the same thermal mass as the standard design.
PROPOSED DESIGN
The proposed design may be modeled with the default 20 percent exposed mass/80 percent covered mass or with actual mass areas modeled as separate covered and exposed mass surfaces. Exposed mass surfaces covered with flooring material that is in direct contact with the slab can be modeled as exposed mass. Examples of such materials are tile, stone, vinyl, linoleum, and hardwood.
STANDARD DESIGN
The conditioned slab floor in the standard design is assumed to be 20 percent exposed slab and 80 percent slab covered by carpet or casework. Interior mass assumptions as described in Chapter 6.10.4.1 Internal Thermal Mass are also assumed. No other mass elements are modeled in the standard design. The standard design mass is modeled with the following characteristics:
- The conditioned slab floor area (slab area) shall have a thickness of 3.5 inches, a volumetric heat capacity of 28 Btu/ft3-°F, and a conductivity of 0.98 Btu-in/hr-ft2-°F. The exposed portion shall have a surface conductance of 1.3 Btu/h-ft2-°F (no thermal resistance on the surface), and the covered portion shall have a surface conductance of 0.50 Btu/h-ft2-°F, typical of a carpet and pad.
- The “exposed” portion of the conditioned non-slab floor area shall have a thickness of 2.0 inches, a volumetric heat capacity of 28 Btu/ft3-°F, a conductivity of 0.98 Btu-in/hr- ft2-ºF; and a surface conductance of 1.3 Btu/h- ft2-°F (no added thermal resistance on the surface). These thermal mass properties apply to the “exposed” portion of non-slab floors for both the proposed design and standard design. The covered portion of non-slab floors is assumed to have no thermal mass.
VERIFICATION AND REPORTING
Exposed mass greater than 20 percent exposed slab on grade, and any other mass modeled by the user is reported as a special feature on the LMCC.
Doors
Doors are defined as an opening in a building envelope. If the rough opening of a door includes fenestration equal to 25 percent or more of glass or fenestration, it is fenestration. (See Chapter 6.10.6.6 Fenestration.) Doors with less than 25 percent fenestration are considered an opaque door.
PROPOSED DESIGN
The compliance software shall allow users to enter doors specifying the U-factor, area, and orientation. Doors to the exterior or to unconditioned zones are modeled as part of the conditioned zone. For doors with less than 25 percent glass area, the U-factor shall come from Reference Appendices, Joint Appendix JA4, Table 4.5.1 (default U-factor 0.20) or from National Fenestration Rating Council (NFRC) certification data for the entire door. For unrated doors, the glass area of the door, calculated as the sum of all glass surfaces plus 2 inches on all sides of the glass (to account for a frame), is modeled under the rules for fenestrations; the opaque area of the door is considered the total door area minus this calculated glass area. Doors with 25 percent or more glass area are modeled under the rules for fenestrations using the total area of the door.
When modeling a garage zone, large garage doors (metal roll-up or wood) are modeled with a 1.0 U-factor.
STANDARD DESIGN
The standard design has the same door area for each dwelling unit as the proposed design.. The U-factor for the standard design is taken from §170.2 and Table 170.2-A. All swinging opaque doors are assumed to have a U-factor of 0.20. The net opaque wall area is reduced by the door area in the standard design.
VERIFICATION AND REPORTING
Door area and U-factor are reported on the LMCC.
Fenestration
Fenestration is modeled with a U-factor and solar heat gain coefficient (SHGC). Acceptable sources of these values are National Fenestration Rating Council (NFRC), default tables from §110.6 of the Energy Code, and Reference Appendices, Nonresidential Appendix NA6.
In limited cases for certain site-built fenestration that is field fabricated, the performance factors (U-factor, SHGC) may come from Reference Appendices, Nonresidential Appendix NA6 as described in Exception 3 to §170.2(a)3Aii.
There is no detailed model of chromogenic fenestration available. As allowed by Exception 2 to §170.2(a)3Aii, the lower-rated labeled U-factor and SHGC may be used only when installed with automatic controls as noted in the exception. Chromogenic fenestration cannot be averaged with nonchromogenic fenestration.
PROPOSED DESIGN
The compliance software allows users to enter individual skylights and fenestration types, the U-factor, SHGC, area, orientation, and tilt.
Performance datum (U-factors and SHGC) are from NFRC values or from the CEC default tables from §110.6 of the Energy Code. In spaces other than sunspaces, solar gains from windows or skylights use the California Simulation Engine (CSE) default solar gain targeting or similar calculation method approved by the Energy Commission.
Skylights are a fenestration with a slope of 60 degrees or more. Skylights are modeled as part of a roof.
STANDARD DESIGN
If the proposed design fenestration area is less than 20 percent of the conditioned floor area, and less than 40 percent of the exterior wall area, the standard design fenestration area is set equal to the proposed design fenestration area. Otherwise, the standard design fenestration area is set equal to 20 percent of the conditioned floor area, or 40 percent of the exterior wall area, whichever is smaller.
The standard design has no skylights.
The net wall area on each orientation is reduced by the fenestration area and door area on each façade. The U-factor and SHGC performance factors for the standard design are taken from §170.2 and Table 170.2-A. In cases where the SHGC is “NR” the standard design is equal to 0.35.
VERIFICATION AND REPORTING
Fenestration area, U-factor, SHGC, orientation, and tilt are reported on the LMCC.
Overhangs and Sidefins
PROPOSED DESIGN
Compliance software users enter a set of basic parameters for a description of an overhang and sidefin for each individual fenestration or window area entry. The basic parameters include fenestration height, overhang/sidefin length, and overhang/sidefin height. Compliance software user entries for overhangs may also include fenestration width, overhang left extension, and overhang right extension. Compliance software user entries for sidefins may also include fin left extension and fin right extension for both left and right fins. Walls at right angles to windows may be modeled as sidefins.
Figure 14: Overhang Dimensions
![Overhang dimensions Overhang dimensions](/site/cache/public/images/image-/image-tpvehrflsgkzh/fieldList/file_path/674507__910__546__down__95.png)
Source: California Energy Commission
Figure 15: Sidefin Dimensions
![Title: Sidefin dimensions - Description: P2782#yIS1 Title: Sidefin dimensions - Description: P2782#yIS1](/site/cache/public/images/image-/image-lrkknnwfosykv/fieldList/file_path/674512__824__540__down__95.png)
Source: California Energy Commission
STANDARD DESIGN
The standard design does not have overhangs or sidefins.
VERIFICATION AND REPORTING
Overhang and fin dimensions are reported on the LMCC or NRCC.
Interior Shading Devices
For both the proposed and standard design, all windows are assumed to have draperies, and skylights are assumed to have no interior shading. Window medium drapes are closed at night and half open in the daytime hours. Interior shading is not a compliance variable and is not user-editable.
Exterior Shading
For both the proposed and standard design, all windows are assumed to have bug screens, and skylights are assumed to have no exterior shading. Exterior shading is modeled as an additional glazing system layer using the ASHRAE Window Attachment (ASHWAT) calculation or approved method showing minimum energy equivalency.
PROPOSED DESIGN
The compliance software shall require the user to accept the default exterior shading devices, which are bug screens for windows and none for skylights. Credit for shading devices that are allowable for prescriptive compliance are not allowable in performance compliance.
STANDARD DESIGN
The standard design shall assume bug screens. The standard design does not have skylights.
Slab on Grade Floors
PROPOSED DESIGN
The compliance software allows users to enter areas and exterior perimeter of slabs that are heated or unheated, covered, or exposed, and with or without slab-edge insulation. Perimeter is the length of wall between conditioned space and the exterior, but it does not include edges that cannot be insulated, such as between the house and the garage. The default condition for the proposed design is that 80 percent of each slab area is carpeted or covered by walls and cabinets, and 20 percent is exposed. Inputs other than the default condition require that carpet and exposed slab conditions are documented on the construction plans.
When the proposed heating distribution is radiant floor heating (heated slab), the compliance software user will identify that the slab is heated and model the proposed slab edge insulation. The mandatory minimum requirement is R-5 insulation in Climate Zones 1-15 and R-10 in Climate Zone 16 (§110.8[g], Table 110.8-A).
STANDARD DESIGN
The standard design perimeter lengths and slab on grade areas are the same as the proposed design. 80 percent of standard design slab area is carpeted, and 20 percent is exposed. For the standard design, an unheated slab edge has no insulation with the exception of Climate Zone 16, which assumes R-7 to a depth of 16 inches. The standard design for a heated slab is a heated slab with the mandatory slab edge insulation of R-5 in Climate Zones 1-15 and R-10 in Climate Zone 16.
VERIFICATION AND REPORTING
Slab areas, perimeter lengths, and inputs of other than the default condition are reported on the LMCC or NRCC.
Underground Floors
PROPOSED DESIGN
The compliance software allows users to enter areas and depth below grade of slab floors occurring below grade. Unlike slab-on-grade floors, there is no perimeter length associated with underground floors.
STANDARD DESIGN
The standard design underground floor areas are the same as the proposed design.
Raised Floors
PROPOSED DESIGN
The compliance software allows the user to input floor areas and constructions for raised floors over a crawl space, over exterior (garage or unconditioned), and concrete raised floors. The proposed floor area and constructions are consistent with the actual building design.
STANDARD DESIGN
The standard design has the same area and type of construction as the proposed design. The thermal characteristics meet §170.2 and Table 170.2-A. For floor areas that are framed construction, the standard design floor has R-19 in 2x6 wood framing, 16-in. on center (0.037 U-factor). For floor areas that are concrete raised floors, the standard design floor is 6 inches of normal weight concrete with R-8 continuous insulation in Climate Zones 1, 2, 11, 13, 14, 16; Climate Zones 12 and 15 have R-4; Climate Zones 3-10 have R-0.
VERIFICATION AND REPORTING
Raised floor areas and constructions are reported on the LMCC or NRCC.