These building descriptors apply to slabongrade floors that are in direct contact with the ground.
Slab Floor Name  
Applicability  All slab floors, optional 

Definition  A unique name or code that relates the exposed floor to the construction documents. 
Units  Text, unique 
Input Restrictions  None 
Baseline Rules  Not applicable 
Slab Floor Type  
Applicability  All slab floors, required 

Definition  One of two classes for floors in contact with ground. The classes are: 1) heated slabongrade floors and 2) unheated slabongrade floors. Heated slabongrade floors include all floors that are heated directly in order to provide heating to the space. Unheated slabongrade floors are all other floors in contact with ground. See the baseline standards and the associated User's Manuals for additional definition. 
Units  List: heated or unheated 
Input Restrictions  None 
Baseline Rules  Unheated 
Slab Floor Geometry  
Applicability  All slab floors, required 

Definition  A geometric construct representing a slab floor in contact with the earth. The geometric representation can vary depending on how the energy simulation software models slabsongrade. Some models require that only the perimeter of the slab be entered. Other models divide the slab into a perimeter band within 2 ft of the edge and the interior portion or core area, such that the perimeter area and the core area sum to the total area of the slab. 
Units  Data structure: as appropriate for the simulation tool 
Input Restrictions  No restrictions 
Baseline Rules  Same as baseline building 
Slab Floor Construction  
Applicability  All slab floors, required input 

Definition 
A description of how the slab is insulated (or not). How the construction is described will depend on the energy simulation model. Simple models may include just an Ffactor, representing an instantaneous heat loss/gain to outside air. The Ffactor could be related to the configuration of insulation in the proposed design. Other slab loss models may require that the surface area of the slab floor be divided between the perimeter and the interior. The insulation conditions then define heat transfer between both outside air and ground temperature. The insulation condition for slabs includes the Rvalue of the insulation and the distance it extends into the earth at the slab edge and how far it extends underneath the slab. 
Units  Data structure: depends on the model that is used 
Input Restrictions  If the perimeter method is used to model the slab, Ffactors shall be taken from Appendix A of ASHRAE Standard 90.12001 or ASHRAE Standard 90.12007. For all methods, inputs shall be consistent with the construction documents. 
Baseline Rules  Slab loss shall be modeled in the same manner in the baseline building as in the proposed design, e.g. if the perimeter method is used for the proposed design, the same method shall be used for the baseline building. The configuration of insulation and the Ffactors for the baseline building are shown in [bookref id="baselinebuildingffactorcriteriaforslabongradefloors"]. If the perimeter method is not used, then the Ffactors from the table shall be used in the baseline building. If an alternative modeling method is used, then inputs to the method for the baseline building shall be consistent with the insulation configuration described in [bookref id="baselinebuildingffactorcriteriaforslabongradefloors"]. 
[table title="Baseline Building Ffactor Criteria for SlabonGrade Floors" id="baselinebuildingffactorcriteriaforslabongradefloors"]
Applicable Standard  Condition  Space Category  Climate Zone  Baseline Building  
Insulation Configuration  FFactor  
90.1 – 2001  Unheated  Nonresidential  17  NR  0.730 
8  R10 for 24 in. vertical  0.540  
Residential  16  NR  0.730  
7  R10 for 24 in. vertical  0.540  
8  R15 for 24 in. vertical  0.520  
SemiHeated  1 8  NR  0.730  
Heated  Nonresidential  1 4  R7.5 for 12 in. vertical  1.020  
5 7  R10 for 36 in. vertical  0.840  
8  R10 for 48 in. vertical  0.780  
Residential  1 3  R7.5 for 12 in. vertical  1.020  
4, 5  R10 for 36 in. vertical  0.840  
6 8  R10 for 48 in. vertical  0.780  
SemiHeated  1 7  R7.5 for 12 in. vertical  1.020  
8  R7.5 for 24 in. vertical  .0950  
90.1 – 2007  Unheated  Nonresidential  15  NR  0.730 
6  R10 for 24 in. vertical  0.540  
7,8  R15 for 24 in. vertical  0.520  
Residential  1 3  NR  0.730  
4, 5  R10 for 24 in. vertical  0.540  
6, 7  R15 for 24 in. vertical  0.520  
8  R20 for 24 in. vertical  0.510  
SemiHeated  1 8  NR  0.730  
Heated  Nonresidential  1, 2  R7.5 for 12 in. vertical  1.020  
3  R10 for 24 in. vertical  0.900  
4 6  R15 for 24 in. vertical  0.860  
7  R20 for 24 in. vertical  0.843  
8  R20 for 48 in. vertical  0.688  
Residential  1, 2  R7.5 for 12 in. vertical  1.020  
3  R10 for 24 in. vertical  0.900  
4, 5  R15 for 24 in. vertical  0.860  
6 8  R20 for 48 in. vertical  0.688  
SemiHeated  1 6  R7.5 for 12 in. vertical  1.020  
7, 8  R10 for 24 in. vertical  0.900 
These building descriptors apply to slabongrade floors that are in direct contact with the ground.
Slab Floor Name  
Applicability  All slab floors, optional 

Definition  A unique name or code that relates the exposed floor to the construction documents. 
Units  Text, unique 
Input Restrictions  None 
Baseline Rules  Not applicable 
Slab Floor Type  
Applicability  All slab floors, required 

Definition  One of two classes for floors in contact with ground. The classes are: 1) heated slabongrade floors and 2) unheated slabongrade floors. Heated slabongrade floors include all floors that are heated directly in order to provide heating to the space. Unheated slabongrade floors are all other floors in contact with ground. See the baseline standards and the associated User's Manuals for additional definition. 
Units  List: heated or unheated 
Input Restrictions  None 
Baseline Rules  Unheated 
Slab Floor Geometry  
Applicability  All slab floors, required 

Definition  A geometric construct representing a slab floor in contact with the earth. The geometric representation can vary depending on how the energy simulation software models slabsongrade. Some models require that only the perimeter of the slab be entered. Other models divide the slab into a perimeter band within 2 ft of the edge and the interior portion or core area, such that the perimeter area and the core area sum to the total area of the slab. 
Units  Data structure: as appropriate for the simulation tool 
Input Restrictions  No restrictions 
Baseline Rules  Same as baseline building 
Slab Floor Construction  
Applicability  All slab floors, required input 

Definition 
A description of how the slab is insulated (or not). How the construction is described will depend on the energy simulation model. Simple models may include just an Ffactor, representing an instantaneous heat loss/gain to outside air. The Ffactor could be related to the configuration of insulation in the proposed design. Other slab loss models may require that the surface area of the slab floor be divided between the perimeter and the interior. The insulation conditions then define heat transfer between both outside air and ground temperature. The insulation condition for slabs includes the Rvalue of the insulation and the distance it extends into the earth at the slab edge and how far it extends underneath the slab. 
Units  Data structure: depends on the model that is used 
Input Restrictions  If the perimeter method is used to model the slab, Ffactors shall be taken from Appendix A of ASHRAE Standard 90.12007. For all methods, inputs shall be consistent with the construction documents. 
Baseline Rules  Slab loss shall be modeled in the same manner in the baseline building as in the proposed design, e.g. if the perimeter method is used for the proposed design, the same method shall be used for the baseline building. The configuration of insulation and the Ffactors for the baseline building are shown in [bookref id="baselinebuildingffactorcriteriaforslabongradefloors"]. If the perimeter method is not used, then the Ffactors from the table shall be used in the baseline building. If an alternative modeling method is used, then inputs to the method for the baseline building shall be consistent with the insulation configuration described in [bookref id="baselinebuildingffactorcriteriaforslabongradefloors"]. 
[table title="Baseline Building Ffactor Criteria for SlabonGrade Floors" id="baselinebuildingffactorcriteriaforslabongradefloors"]
Applicable Standard  Condition  Space Category  Climate Zone  Baseline Building  
Insulation Configuration  FFactor  
90.1 – 2007  Unheated  Nonresidential  15  NR  0.730 
6  R10 for 24 in. vertical  0.540  
7,8  R15 for 24 in. vertical  0.520  
Residential  1 3  NR  0.730  
4, 5  R10 for 24 in. vertical  0.540  
6, 7  R15 for 24 in. vertical  0.520  
8  R20 for 24 in. vertical  0.510  
SemiHeated  1 8  NR  0.730  
Heated  Nonresidential  1, 2  R7.5 for 12 in. vertical  1.020  
3  R10 for 24 in. vertical  0.900  
4 6  R15 for 24 in. vertical  0.860  
7  R20 for 24 in. vertical  0.843  
8  R20 for 48 in. vertical  0.688  
Residential  1, 2  R7.5 for 12 in. vertical  1.020  
3  R10 for 24 in. vertical  0.900  
4, 5  R15 for 24 in. vertical  0.860  
6 8  R20 for 48 in. vertical  0.688  
SemiHeated  1 6  R7.5 for 12 in. vertical  1.020  
7, 8  R10 for 24 in. vertical  0.900 
These building descriptors apply to slabongrade floors that are in direct contact with the ground.
Slab Floor Name  
Applicability  All slab floors, optional 

Definition  A unique name or code that relates the exposed floor to the construction documents. 
Units  Text, unique 
Input Restrictions  None 
Baseline Rules  Not applicable 
Slab Floor Type  
Applicability  All slab floors, required 

Definition  One of two classes for floors in contact with ground. The classes are: 1) heated slabongrade floors and 2) unheated slabongrade floors. Heated slabongrade floors include all floors that are heated directly in order to provide heating to the space. Unheated slabongrade floors are all other floors in contact with ground. See the baseline standards and the associated User's Manuals for additional definition. 
Units  List: heated or unheated 
Input Restrictions  None 
Baseline Rules  Unheated 
Slab Floor Geometry  
Applicability  All slab floors, required 

Definition  A geometric construct representing a slab floor in contact with the earth. The geometric representation can vary depending on how the energy simulation software models slabsongrade. Some models require that only the perimeter of the slab be entered. Other models divide the slab into a perimeter band within 2 ft of the edge and the interior portion or core area, such that the perimeter area and the core area sum to the total area of the slab. 
Units  Data structure: as appropriate for the simulation tool 
Input Restrictions  No restrictions 
Baseline Rules  Same as baseline building 
Slab Floor Construction  
Applicability  All slab floors, required input 

Definition 
A description of how the slab is insulated (or not). How the construction is described will depend on the energy simulation model. Simple models may include just an Ffactor, representing an instantaneous heat loss/gain to outside air. The Ffactor could be related to the configuration of insulation in the proposed design. Other slab loss models may require that the surface area of the slab floor be divided between the perimeter and the interior. The insulation conditions then define heat transfer between both outside air and ground temperature. The insulation condition for slabs includes the Rvalue of the insulation and the distance it extends into the earth at the slab edge and how far it extends underneath the slab. 
Units  Data structure: depends on the model that is used 
Input Restrictions  If the perimeter method is used to model the slab, Ffactors shall be taken from Appendix A of ASHRAE Standard 90.12007. For all methods, inputs shall be consistent with the construction documents. 
Baseline Rules  Slab loss shall be modeled in the same manner in the baseline building as in the proposed design, e.g. if the perimeter method is used for the proposed design, the same method shall be used for the baseline building. The configuration of insulation and the Ffactors for the baseline building are shown in Table 6.5.91. If the perimeter method is not used, then the Ffactors from the table shall be used in the baseline building. If an alternative modeling method is used, then inputs to the method for the baseline building shall be consistent with the insulation configuration described in Table 6.5.91. 
Table 6.5.91: Baseline Building Ffactor Criteria for SlabonGrade Floors
Applicable Standard  Condition  Space Category  Climate Zone  Baseline Building  
Insulation Configuration  FFactor  
90.1 – 2007  Unheated  Nonresidential  15  NR  0.730 
6  R10 for 24 in. vertical  0.540  
7,8  R15 for 24 in. vertical  0.520  
Residential  1 3  NR  0.730  
4, 5  R10 for 24 in. vertical  0.540  
6, 7  R15 for 24 in. vertical  0.520  
8  R20 for 24 in. vertical  0.510  
SemiHeated  1 8  NR  0.730  
Heated  Nonresidential  1, 2  R7.5 for 12 in. vertical  1.020  
3  R10 for 24 in. vertical  0.900  
4 6  R15 for 24 in. vertical  0.860  
7  R20 for 24 in. vertical  0.843  
8  R20 for 48 in. vertical  0.688  
Residential  1, 2  R7.5 for 12 in. vertical  1.020  
3  R10 for 24 in. vertical  0.900  
4, 5  R15 for 24 in. vertical  0.860  
6 8  R20 for 48 in. vertical  0.688  
SemiHeated  1 6  R7.5 for 12 in. vertical  1.020  
7, 8  R10 for 24 in. vertical  0.900 
These building descriptors apply to slabongrade floors that are in direct contact with the ground. Heat transfer from belowgrade walls may be modeled using a constant annual or monthly ground temperature. The temperatures from table 3.9.11 may be used as a default.
Slab Floor Name 


Applicability 
All slab floors, optional 
Definition 
A unique name or code that relates the exposed floor to the construction documents. 
Units 
Text, unique 
Input Restrictions 
None 
Baseline Rules 
Not applicable 
Slab Floor Type 


Applicability 
All slab floors, required 
Definition 
One of two classes for floors in contact with ground. The classes are: 1) heated slabongrade floors and 2) unheated slabongrade floors. Heated slabongrade floors include all floors that are heated directly in order to provide heating to the space. Unheated slabongrade floors are all other floors in contact with ground. 
Units 
List: heated or unheated 
Input Restrictions 
None 
Baseline Rules 
The baseline building slab floor is unheated. 
Slab Floor Geometry 


Applicability 
All slab floors, required 
Definition 
A geometric construct representing a slab floor in contact with the earth. The geometric representation can vary depending on how the energy simulation software models slabsongrade. Some models require that only the perimeter of the slab be entered. Other models divide the slab into a perimeter band within 2 ft of the edge and the interior portion or core area, such that the perimeter area and the core area sum to the total area of the slab. 
Units 
Data structure: as appropriate for the simulation tool which may include area, perimeter or other information 
Input Restrictions 
No restrictions 
Baseline Rules 
Same as baseline building 
Slab Floor Construction 


Applicability 
All slab floors, required input 
Definition 
A description of how the slab is insulated (or not). How the construction is described will depend on the energy simulation model. Simple models may include just an Ffactor, representing an instantaneous heat loss/gain to outside air. The Ffactor could be related to the configuration of insulation in the proposed design. Other slab loss models may require that the surface area of the slab floor be divided between the perimeter and the interior. The insulation conditions then define heat transfer between both outside air and ground temperature. The insulation condition for slabs includes the Rvalue of the insulation and the distance it extends into the earth at the slab edge and how far it extends underneath the slab. 
Units 
Data structure: depends on the model that is used 
Input Restrictions 
If the perimeter method is used to model the slab, Ffactors shall be taken from Appendix A of ASHRAE Standard 90.12013. For all methods, inputs shall be consistent with the construction documents. 
Baseline Rules 
Slab loss shall be modeled in the same manner in the baseline building as in the proposed design, e.g. if the perimeter method is used for the proposed design, the same method shall be used for the baseline building. 
Table 3.5.91: Baseline Building Ffactor Criteria for SlabonGrade Floors

Nonresidential 
Residential 
SemiHeated 

Climate Zone 
Name 
Ffactor 
Name 
Ffactor 
Name 
Ffactor 
1 
NR 
0.730 
NR 
0.730 
NR 
0.730 
2 

3 

4 

5 

6 

7 
R10 for 24 in. v 
0.540 

8 
R10 for 24 in. v 
0.540 
R15 for 24 in. v 
0.520 
These building descriptors apply to slabongrade floors that are in direct contact with the ground.
Slab Floor Name  
Applicability  All slab floors, optional 

Definition  A unique name or code that relates the exposed floor to the construction documents. 
Units  Text, unique 
Input Restrictions  None 
Slab Floor Geometry  
Applicability  All slab floors, required 

Definition  A geometric construct representing a slab floor in contact with the earth. The geometric representation can vary depending on how the energy simulation software models slabsongrade. Some models require that only the perimeter of the slab be entered. Other models divide the slab into a perimeter band within 2 ft of the edge and the interior portion or core area, such that the perimeter area and the core area sum to the total area of the slab. 
Units  Data structure: as appropriate for the simulation tool 
Input Restrictions  No restrictions 
Slab Floor Construction  
Applicability  All slab floors, required input 

Definition 
A description of how the slab is insulated (or not). How the construction is described will depend on the energy simulation model. Simple models may include just an Ffactor, representing an instantaneous heat loss/gain to outside air. The Ffactor could be related to the configuration of insulation in the proposed design. Other slab loss models may require that the surface area of the slab floor be divided between the perimeter and the interior. The insulation conditions then define heat transfer between both outside air and ground temperature. The insulation condition for slabs includes the Rvalue of the insulation and the distance it extends into the earth at the slab edge and how far it extends underneath the slab. 
Units  Data structure: depends on the model that is used 
Input Restrictions  If the perimeter method is used to model the slab, Ffactors shall be taken from Appendix A of ASHRAE Standard 90.12001 or ASHRAE Standard 90.12007. For all methods, inputs shall be consistent with the construction documents. 
These building descriptors apply to slabongrade floors that are in direct contact with the ground.
Slab Floor Name  
Applicability  All slab floors, optional 

Definition  A unique name or code that relates the exposed floor to the construction documents. 
Units  Text, unique 
Input Restrictions  None 
Slab Floor Geometry  
Applicability  All slab floors, required 

Definition  A geometric construct representing a slab floor in contact with the earth. The geometric representation can vary depending on how the energy simulation software models slabsongrade. Some models require that only the perimeter of the slab be entered. Other models divide the slab into a perimeter band within 2 ft of the edge and the interior portion or core area, such that the perimeter area and the core area sum to the total area of the slab. 
Units  Data structure: as appropriate for the simulation tool 
Input Restrictions  No restrictions 
Slab Floor Construction  
Applicability  All slab floors, required input 

Definition 
A description of how the slab is insulated (or not). How the construction is described will depend on the energy simulation model. Simple models may include just an Ffactor, representing an instantaneous heat loss/gain to outside air. The Ffactor could be related to the configuration of insulation in the proposed design. Other slab loss models may require that the surface area of the slab floor be divided between the perimeter and the interior. The insulation conditions then define heat transfer between both outside air and ground temperature. The insulation condition for slabs includes the Rvalue of the insulation and the distance it extends into the earth at the slab edge and how far it extends underneath the slab. 
Units  Data structure: depends on the model that is used 
Input Restrictions  If the perimeter method is used to model the slab, Ffactors shall be taken from Appendix A of ASHRAE Standard 90.12001 or ASHRAE Standard 90.12007. For all methods, inputs shall be consistent with the construction documents. 