WASHINGTON STATE REGISTER

WSR 02-14-032

EMERGENCY RULES

BUILDING CODE COUNCIL

[ Filed June 24, 2002, 4:03 p.m. , effective July 1, 2002 ]

Date of Adoption: June 14, 2002.

Purpose: To amend chapter 51-11 WAC, the 2001 Washington State Energy Code, as [it] relates to residential multiunit buildings over five stories in height.

Citation of Existing Rules Affected by this Order: Amending WAC 51-11-0530, 51-11-0533, and 51-11-0625 (Tables 5-1, 6-1, and 6-2).

Statutory Authority for Adoption: RCW 19.27A.020, 19.27A.045, and 19.27.020.

Under RCW 34.05.350 the agency for good cause finds that immediate adoption, amendment, or repeal of a rule is necessary for the preservation of the public health, safety, or general welfare, and that observing the time requirements of notice and opportunity to comment upon adoption of a permanent rule would be contrary to the public interest.

Reasons for this Finding: The state Building Code Council (council), based on the following good cause, finds that an emergency affecting the general welfare of the state of Washington exists. The council further finds that immediate amendment of a certain council rule is necessary for the public welfare and that observing the time requirements of notice and opportunity to comment would be contrary to the public interest.

The declaration of emergency affecting the general welfare of the state of Washington is based on the following findings:

The Washington State Energy Code Table 5-1 and Tables 6-1 and 6-2 amendments contained herein as adopted by the council under emergency rule making pursuant to RCW 34.05.350, will provide economic relief to multifamily residential builders or building owners by allowing the same thermal envelope requirements in effect since 1991. To conserve energy and provide relief from rising energy costs, in 2001 the state Building Code Council amended the residential building envelope requirements under their authority in RCW 19.27A.045. The council simplified the code language by making the same thermal envelope requirements applicable to all buildings regardless of space heat source, with minor exceptions.

This change may have unanticipated consequences for residential buildings over five stories in height. The cost benefit analysis reviewed by the technical advisory group, and the council did not include high rise buildings. The thermal envelope measures required for low rise buildings five stories and under were found to be cost effective. These same measures may not always result in an immediate energy savings benefit for buildings over five stories in height. This could ultimately result in undue expense for the building owner and occupants. The council finds this may be an economic burden on the building and design industries, which could result in an increase in the cost of housing for high rise multifamily residential buildings including hotels, apartments and condominiums. Immediate adoption of this amendment is necessary so as to not delay the construction of high rise multifamily residential buildings, and so as not to adversely affect the state's building industry, building owners, and building tenants by possibly imposing an unanticipated economic penalty. The council finds it should not impose the new standards on high rise multifamily buildings while an economic analysis is conducted. The amendment herein takes into consideration the general welfare of the public by reverting back to the previous Washington State Energy Code residential building envelope requirements for high rise residential. The council also has taken the necessary steps to adopt a permanent rule. The permanent rule will not be effective until the end of the 2003 legislative session as per RCW 19.27.074.

Number of Sections Adopted in Order to Comply with Federal Statute: New 0, Amended 0, Repealed 0; Federal Rules or Standards: New 0, Amended 0, Repealed 0; or Recently Enacted State Statutes: New 0, Amended 0, Repealed 0.

Number of Sections Adopted at Request of a Nongovernmental Entity: New 0, Amended 0, Repealed 0.

Number of Sections Adopted on the Agency's Own Initiative: New 0, Amended 3, Repealed 0.

Number of Sections Adopted in Order to Clarify, Streamline, or Reform Agency Procedures: New 0, Amended 3, Repealed 0.

Number of Sections Adopted Using Negotiated Rule Making: New 0, Amended 0, Repealed 0; Pilot Rule Making: New 0, Amended 0, Repealed 0; or Other Alternative Rule Making: New 0, Amended 3, Repealed 0.
Effective Date of Rule: July 1, 2002.

June 14, 2002

Tim Nogler

for Jim Lewis

Council Chair

[AMENDATORY SECTION (Amending WSR 02-01-112, filed 12/18/01)]WAC 51-11-0530 Table 5-1.

TABLE 5-1

TARGET COMPONENT VALUES FOR GROUP R OCCUPANCY³

	Climate Zone
Component	1	2
Glazing % Floor Area	15%	15%
Vertical Glazing U-Factor	U = 0.400	U = 0.400
Overhead Glazing U-Factor	U = 0.58	U = 0.58
Doors	U = 0.200 (R-5)	U = 0.200 (R-5)
Ceilings Attic Single Rafter/ Joist Vaulted	U = 0.031 (R-38) U = 0.034 (R-30)	U = 0.031 (R-38) U = 0.034 (R-30)
Walls² Space Heat Type: Electric Resistance	U = 0.058 (R-19A)	U = 0.044 (R-19 + R-5)
Other	U = 0.062¹ (R-19)	U = 0.062¹ (R-19)
Floors	U = 0.029 (R-30)	U = 0.029 (R-30)
Slab on Grade Slab R-Value	F = 0.54 (R-10)	F = 0.54 (R-10)
Below Grade Interior
Wall R-Value	R-19	R-19
2' Depth: Walls Slab	U = 0.043 F = 0.69	U = 0.043 F = 0.69
3.5' Depth: Walls Slab	U = 0.041 F = 0.64	U = 0.041 F = 0.64
7' Depth: Walls Slab	U = 0.037 F = 0.57	U = 0.037 F = 0.57
Below Grade Exterior
Wall R-Value	R-10	R-12
2' Depth: Walls Slab	U = 0.070 F = 0.60	U = 0.061 F = 0.60
3.5' Depth: Walls Slab	U = 0.064 F = 0.57	U = 0.057 F = 0.57
7' Depth: Walls Slab	U = 0.056 F = 0.42	U = 0.050 F = 0.42

1. Log and solid timber walls that have a minimum average thickness of 3.5" are exempt from wall target UA and proposed UA calculations.

2. "A" means advanced framing. For more information, see Section 1005.2.

3. For Group R-1 Occupancy buildings over five stories, see Table 5-1A.

[Statutory Authority: RCW 19.27A.025, 19.27A.045. 02-01-112, § 51-11-0530, filed 12/18/01, effective 7/1/02; 01-03-010, § 51-11-0530, filed 1/5/01, effective 7/1/01; 98-03-003, § 51-11-0530, filed 1/8/98, effective 7/1/98. Statutory Authority: Chapters 19.27 and 19.27A RCW and 1994 c 226. 95-01-126, § 51-11-0530, filed 12/21/94, effective 6/30/95. Statutory Authority: Chapter 19.27A RCW. 92-01-140, § 51-11-0530, filed 12/19/91, effective 7/1/92.]

Reviser's note: The bracketed material preceding the section above was supplied by the code reviser's office.

Reviser's note: RCW 34.05.395 requires the use of underlining and deletion marks to indicate amendments to existing rules. The rule published above varies from its predecessor in certain respects not indicated by the use of these markings.

[AMENDATORY SECTION (Amending WSR 02-01-112, filed 12/18/01)]WAC 51-11-0533 ((~~Table 5-4 -- Reserved~~)).

TABLE 5-1A

TARGET COMPONENT VALUES

FOR GROUP R-1 OCCUPANCY, BUILDINGS OVER 5 STORIES

		Electric Resistance		Other Fuels
		Climate Zone		Climate Zone
Component		1	2	1	2
Glazing % Floor Area		15%	15%	15%	15%
Vertical Glazing U-Factor		U= 0.400	U= 0.400	U= 0.650	U= 0.600
Overhead Glazing U-Factor		U= 0.58	U= 0.58	U= 0.68	U= 0.64
Doors		U= 0.200 (R-5)	U= 0.200 (R-5)	U= 0.400 (R-2.5)	U= 0.400 (R-2.5)
Ceilings
	Attic	U= 0.031 (R-38)	U= 0.031 (R-38)	U= 0.036 (R-30)	U= 0.031 (R-38)
	Single Rafter/Joist Vaulted	U= 0.034 (R-30)	U= 0.034 (R-30)	U= 0.034 (R-30)	U= 0.034 (R-30)
Walls²		U= 0.058 (R-19A)	U= 0.044 (R-19+5A)	U= 0.062¹ (R-19)	U= 0.062¹ (R-19)
Floors		U= 0.029 (R-30)	U= 0.029 (R-30)	U= 0.041 (R-19)	U= 0.029 (R-30)
Slab on Grade Slab R-Value		F= 0.54 (R-10)	F= 0.54 (R-10)	F= 0.54 (R-10)	F= 0.54 (R-10)
Below Grade Interior
Wall R-Value		R-19	R-19	R-19	R-19
2' Depth: Walls Slab		U= 0.043 F= 0.69	U= 0.043 F= 0.69	U= 0.043 F= 0.69	U= 0.043 F= 0.69
3.5' Depth: Walls Slab		U= 0.041 F= 0.64	U= 0.041 F= 0.64	U= 0.041 F= 0.64	U= 0.041 F= 0.64
7' Depth: Walls Slab		U= 0.037 F= 0.57	U= 0.037 F= 0.57	U= 0.037 F= 0.57	U= 0.037 F= 0.57
Below Grade Exterior
Wall R-Value		R-10	R-12	R-10	R-12
2' Depth: Walls Slab		U= 0.070 F= 0.60	U= 0.061 F= 0.60	U= 0.070 F= 0.60	U= 0.061 F= 0.60
3.5' Depth: Walls Slab		U= 0.064 F= 0.57	U= 0.057 F= 0.57	U= 0.064 F= 0.57	U= 0.057 F= 0.57
7' Depth: Walls Slab		U= 0.056 F= 0.42	U= 0.050 F= 0.42	U= 0.056 F= 0.42	U= 0.050 F= 0.42

1.	Log and Solid Timber walls that have a minimum average thickness of 3.5" are exempt from wall target UA and proposed UA calculations.
2.	"A" means advanced framing. For more information, see Section 1005.2.

[Statutory Authority: RCW 19.27A.025, 19.27A.045. 02-01-112, § 51-11-0533, filed 12/18/01, effective 7/1/02. Statutory Authority: Chapter 19.27A RCW. 92-01-140, § 51-11-0533, filed 12/19/91, effective 7/1/92.]

Reviser's note: The bracketed material preceding the section above was supplied by the code reviser's office.

[AMENDATORY SECTION (Amending WSR 02-01-112, filed 12/18/01)]WAC 51-11-0625 Table 6-1.

TABLE 6-1

PRESCRIPTIVE REQUIREMENTS^0,1 FOR GROUP R OCCUPANCY¹³

CLIMATE ZONE 1

Option	Glazing Area¹⁰: % of Floor	Glazing U-Factor		Door⁹ U- Factor	Ceiling²	Vaulted Ceiling³	Wall Above Grade¹²	Wall• int⁴ Below Grade	Wall• ext⁴ Below Grade	Floor⁵	Slab⁴ on Grade
	Glazing Area¹⁰: % of Floor	Vertical	Overhead¹¹	Door⁹ U- Factor	Ceiling²	Vaulted Ceiling³	Wall Above Grade¹²	Wall• int⁴ Below Grade	Wall• ext⁴ Below Grade	Floor⁵	Slab⁴ on Grade
I.	12%	0.35	0.58	0.20	R-38	R-30	R-15	R-15	R-10	R-30	R-10
II.*	15%	0.40	0.58	0.20	R-38	R-30	R-21	R-21	R-10	R-30	R-10
III.	Unlimited Group R-3 Occupancy Only	0.40	0.58	0.20	R-38	R-30	R-21	R-21	R-10	R-30	R-10

*	Reference Case

0.	Nominal R-values are for wood frame assemblies only or assemblies built in accordance with Section 601.1.
1.	Minimum requirements for each option listed. For example, if a proposed design has a glazing ratio to the conditioned floor area of 13%, it shall comply with all of the requirements of the 15% glazing option (or higher). Proposed designs which cannot meet the specific requirements of a listed option above may calculate compliance by Chapters 4 or 5 of this Code.
2.	Requirement applies to all ceilings except single rafter or joist vaulted ceilings. 'Adv' denotes Advanced Framed Ceiling.
3.	Requirement applicable only to single rafter or joist vaulted ceilings.
4.	Below grade walls shall be insulated either on the exterior to a minimum level of R-10, or on the interior to the same level as walls above grade. Exterior insulation installed on below grade walls shall be a water resistant material, manufactured for its intended use, and installed according to the manufacturer's specifications. See Section 602.2.
5.	Floors over crawl spaces or exposed to ambient air conditions.
6.	Required slab perimeter insulation shall be a water resistant material, manufactured for its intended use, and installed according to manufacturer's specifications. See Section 602.4.
7.	Int. denotes standard framing 16 inches on center with headers insulated with a minimum of R-5 insulation.
8.	This wall insulation requirement denotes R-19 wall cavity insulation plus R-5 foam sheathing.
9.	Doors, including all fire doors, shall be assigned default U-factors from Table 10-6C.
10.	Where a maximum glazing area is listed, the total glazing area (combined vertical plus overhead) as a percent of gross conditioned floor area shall be less than or equal to that value. Overhead glazing with U-factor of U=0.40 or less is not included in glazing area limitations.
11.	Overhead glazing shall have U-factors determined in accordance with NFRC 100 or as specified in Section 502.1.5.
12.	Log and solid timber walls with a minimum average thickness of 3.5" are exempt from this insulation requirement.
13.	For Group R Occupancy buildings over five stories, see Table 6-1A and Table 6-1B.

TABLE 6-1A
PRESCRIPTIVE REQUIREMENTS¹**
FOR GROUP R-1 OCCUPANCY BUILDINGS OVER 5 STORIES

CLIMATE ZONE 1 • HEATING BY ELECTRIC RESISTANCE

Option	Glazing Area¹⁰: % of Floor	Glazing U-Factor		Door ⁹ U-Factor	Ceiling²	Vaulted Ceiling³	Wall Above Grade	Wall• int⁴ Below Grade	Wall• ext⁴ Below Grade	Floor⁵	Slab⁴ on Grade
Option	Glazing Area¹⁰: % of Floor	Vertical	Overhead¹¹	Door ⁹ U-Factor	Ceiling²	Vaulted Ceiling³	Wall Above Grade	Wall• int⁴ Below Grade	Wall• ext⁴ Below Grade	Floor⁵	Slab⁴ on Grade
I.	10%	0.46	0.58	0.40	R-38	R-30	R-21	R-21	R-10	R-30	R-10
II.	12%	0.43	0.58	0.20	R-38	R-30	R-19	R-19	R-10	R-30	R-10
III.	12%	0.40	0.58	0.40	R-38	R-30	R-21	R-21	R-10	R-30	R-10
IV.*	15%	0.40	0.58	0.20	R-38	R-30	R-19	R-19	R-10	R-30	R-10
V.	18%	0.39	0.58	0.20	R-38	R-30	R-21	R-21	R-10	R-30	R-10
VI.	21%	0.36	0.58	0.20	R-38	R-30	R-21	R-21	R-10	R-30	R-10
VII.⁷	25%	0.32⁷	0.58	0.20	R-38	R-30	R-19 +R-5⁸	R-21	R-10	R-30	R-10
VIII.⁷	30%	0.29⁷	0.58	0.20	R-38	R-30	R-19 +R-5⁸	R-21	R-10	R-30	R-10

*	Reference Case
**	Nominal R-values are for wood frame assemblies only or assemblies built in accordance with Section 601.1.
1.	Minimum requirements for each option listed. For example, if a proposed design has a glazing ratio to the conditioned floor area of 19%, it shall comply with all of the requirements of the 21% glazing option (or higher). Proposed designs which cannot meet the specific requirements of a listed option above may calculate compliance by Chapters 4 or 5 of this Code.
2.	Requirement applies to all ceilings except single rafter or joist vaulted ceilings. 'Adv' denotes Advanced Framed Ceiling.
3.	Requirement applicable only to single rafter or joist vaulted ceilings.
4.	Below grade walls shall be insulated either on the exterior to a minimum level of R-10, or on the interior to the same level as walls above grade. Exterior insulation installed on below grade walls shall be a water resistant material, manufactured for its intended use, and installed according to the manufacturer's specifications. See Section 602.2.
5.	Floors over crawl spaces or exposed to ambient air conditions.
6.	Required slab perimeter insulation shall be a water resistant material, manufactured for its intended use, and installed according to manufacturer's specifications. See Section 602.4.
7.	Reserved.
8.	This wall insulation requirement denotes R-19 wall cavity insulation plus R-5 foam sheathing.
9.	Doors, including all fire doors, shall be assigned default U-factors from Table 10-6C.
10.	Where a maximum glazing area is listed, the total glazing area (combined vertical plus overhead) as a percent of gross conditioned floor area shall be less than or equal to that value. Overhead glazing with U-factor of U=0.40 or less is not included in glazing area limitations.
11.	Overhead glazing shall have U-factors determined in accordance with NFRC 100 or as specified in Section 502.1.5.

TABLE 6-1B

PRESCRIPTIVE REQUIREMENTS¹**

FOR GROUP R-1 OCCUPANCY BUILDINGS OVER 5 STORIES

CLIMATE ZONE 1 • HEATING BY OTHER FUELS

Option

HVAC⁹ Equip. Effic.

Glazing Area¹¹: % of Floor

Glazing U-Factor

Door ¹⁰ U-

Factor

Ceiling²

Vaulted Ceiling³

Wall Above Grade

Wall• int⁴ Below Grade

Wall• ext⁴ Below Grade

Floor⁵

Slab⁶ on Grade

Vertical

Over-

head¹²

Med.

10%

0.70

0.68

0.40

R-30

R-15

R-10

R-19

R-10

II.

Med.

12%

0.65

0.68

0.40

R-30

R-15

R-10

R-19

R-10

III.

High

21%

0.75

0.68

0.40

R-30

R-19

R-10

R-19

R-10

IV.*

Med.

21%

0.65

0.68

0.40

R-30

R-19

R-10

R-19

R-10

Low

21%

0.60

0.68

0.40

R-30

R-19

R-10

R-19

R-10

VI.⁷

Med.

25%

0.45⁷

0.68

0.40

R-38

R-30

R-19

R-10

R-25

R-10

VII.⁷

Med.

30%

0.40⁷

0.68

0.40

R-30

R-19

R-10

R-25

R-10

VIII.

Med.

unlimited

0.25

0.40

R-30

R-19

R-10

R-25

R-10

*	Reference Case
**	Nominal R-values are for wood frame assemblies only or assemblies built in accordance with Section 601.1.
1.	Minimum requirements for each option listed. For example, if a proposed design has a glazing ratio to the conditioned floor area of 19%, it shall comply with all of the requirements of the 21% glazing option (or higher). Proposed designs which cannot meet the specific requirements of a listed option above may calculate compliance by Chapters 4 or 5 of this Code.
2.	Requirement applies to all ceilings except single rafter or joist vaulted ceilings. 'Adv' denotes Advanced Framed Ceiling.
3.	Requirement applicable only to single rafter or joist vaulted ceilings.
4.	Below grade walls shall be insulated either on the exterior to a minimum level of R-10, or on the interior to the same level as walls above grade. Exterior insulation installed on below grade walls shall be a water resistant material, manufactured for its intended use, and installed according to the manufacturer's specifications. See Section 602.2.
5.	Floors over crawl spaces or exposed to ambient air conditions.
6.	Required slab perimeter insulation shall be a water resistant material, manufactured for its intended use, and installed according to manufacturer's specifications. See Section 602.4.
7.	Reserved.

8.	Reserved.
9.	Minimum HVAC equipment efficiency requirement. 'Low' denotes an AFUE of 0.74. 'Med.' denotes an AFUE of 0.78. 'High' denotes an AFUE of 0.88. Minimum HVAC equipment efficiency requirement for heat pumps. 'Low' denotes an HSPF of 6.35. 'Med.' denotes an HSPF of 6.8. 'High' an HSPF of 7.7. Water and ground source heat pumps shall be considered as medium efficiency and have a minimum COP as required in Table ~~5-7~~ 14-1B.
10.	Doors, including all fire doors, shall be assigned default U-factors from Table 10-6C.
11.	Where a maximum glazing area is listed, the total glazing area (combined vertical plus overhead) as a percent of gross conditioned floor area shall be less than or equal to that value. Overhead glazing with U-factor of U=0.40 or less is not included in glazing area limitations.
12.	Overhead glazing shall have U-factors determined in accordance with NFRC 100 or as specified in Section 502.1.5.

TABLE 6-2

PRESCRIPTIVE REQUIREMENTS^0,1 FOR GROUP R OCCUPANCY¹³

CLIMATE ZONE 2

Option	Glazing Area¹⁰: % of Floor	Glazing U-Factor		Door⁹ U- Factor	Ceiling²	Vaulted Ceiling³	Wall Above Grade¹²	Wall• int⁴ Below Grade	Wall• ext⁴ Below Grade	Floor⁵	Slab⁴ on Grade
Option	Glazing Area¹⁰: % of Floor	Vertical	Overhead¹¹	Door⁹ U- Factor	Ceiling²	Vaulted Ceiling³	Wall Above Grade¹²	Wall• int⁴ Below Grade	Wall• ext⁴ Below Grade	Floor⁵	Slab⁴ on Grade
I.	10%	0.40	0.58	0.20	R-38	R-30	R-21 int⁷	R-21	R-12	R-30	R-10
II.*	15%	0.40	0.58	0.20	R-38	R-30	R-19 +R-5⁸	R-21	R-12	R-30	R-10
III.	17%	0.37	0.58	0.20	R-38	R-30	R-19 +R-5⁸	R-21	R-12	R-30	R-10
IV.	Unlimited Group R-3 Occupancy Only	0.35	0.58	0.20	R-38	R-30	R-21 int⁷	R-21	R-12	R-30	R-10

*	Reference Case
0.	Nominal R-values are for wood frame assemblies only or assemblies built in accordance with Section 601.1.
1.	Minimum requirements for each option listed. For example, if a proposed design has a glazing ratio to the conditioned floor area of 13%, it shall comply with all of the requirements of the 15% glazing option (or higher). Proposed designs which cannot meet the specific requirements of a listed option above may calculate compliance by Chapters 4 or 5 of this Code.
2.	Requirement applies to all ceilings except single rafter or joist vaulted ceilings. 'Adv' denotes Advanced Framed Ceiling.
3.	Requirement applicable only to single rafter or joist vaulted ceilings.
4.	Below grade walls shall be insulated either on the exterior to a minimum level of R-10, or on the interior to the same level as walls above grade. Exterior insulation installed on below grade walls shall be a water resistant material, manufactured for its intended use, and installed according to the manufacturer's specifications. See Section 602.2.
5.	Floors over crawl spaces or exposed to ambient air conditions.
6.	Required slab perimeter insulation shall be a water resistant material, manufactured for its intended use, and installed according to manufacturer's specifications. See Section 602.4.
7.	Int. denotes standard framing 16 inches on center with headers insulated with a minimum of R-5 insulation.
8.	This wall insulation requirement denotes R-19 wall cavity insulation plus R-5 foam sheathing.
9.	Doors, including all fire doors, shall be assigned default U-factors from Table 10-6C.
10.	Where a maximum glazing area is listed, the total glazing area (combined vertical plus overhead) as a percent of gross conditioned floor area shall be less than or equal to that value. Overhead glazing with U-factor of U=0.40 or less is not included in glazing area limitations.
11.	Overhead glazing shall have U-factors determined in accordance with NFRC 100 or as specified in Section 502.1.5.
12.	Log and solid timber walls with a minimum average thickness of 3.5" are exempt from this insulation requirement.
13.	For Group R Occupancy buildings over five stories, see Table 6-2A and Table 6-2B.

TABLE 6-2A

PRESCRIPTIVE REQUIREMENTS¹**

FOR GROUP R-1 OCCUPANCY BUILDINGS OVER 5 STORIES

CLIMATE ZONE 2 • HEATING BY ELECTRIC RESISTANCE

Option	Glazing Area¹¹: % of Floor	Glazing U-Factor		Door¹⁰ U- Factor	Ceiling²	Vaulted Ceiling³	Wall Above Grade	Wall• int⁴ Below Grade	Wall• ext⁴ Below Grade	Floor⁵	Slab⁶ on Grade
Option	Glazing Area¹¹: % of Floor	Vertical	Overhead¹²	Door¹⁰ U- Factor	Ceiling²	Vaulted Ceiling³	Wall Above Grade	Wall• int⁴ Below Grade	Wall• ext⁴ Below Grade	Floor⁵	Slab⁶ on Grade
I.	10%	0.38	0.58	0.20	R-38	R-30	R-21	R-21	R-12	R-30	R-10
II.	12%	0.40	0.58	0.20	R-38	R-30	R-19+R-5⁸	R-21	R-12	R-25	R-10
III.*	15%	0.40	0.58	0.20	R-38	R-30	R-19+R-5⁸	R-21	R-12	R-30	R-10
IV.	18%	0.38	0.58	0.20	R-38	R-30	R-19+R-5⁸	R-21	R-12	R-30	R-10
V.	21%	0.35	0.58	0.20	R-38Adv	R-38	R-19+R-5⁸	R-21	R-12	R-30	R-10
VI.⁷	25%	0.30⁷	0.58	0.20	R-49Adv	R-38	R-19+R-5⁸	R-21	R-12	R-30	R-10
VII.⁷	30%	0.28⁷	0.58	0.20	R-60Adv	R-38	R-21+R-7.5⁹	R-21	R-12	R-30	R-10

*	Reference Case
**	Nominal R-values are for wood frame assemblies only or assemblies built in accordance with Section 601.1.
1.	Minimum requirements for each option listed. For example, if a proposed design has a glazing ratio to the conditioned floor area of 19%, it shall comply with all of the requirements of the 21% glazing option (or higher). Proposed designs which cannot meet the specific requirements of a listed option above may calculate compliance by Chapters 4 or 5 of this Code.
2.	Requirement applies to all ceilings except single rafter or joist vaulted ceilings. 'Adv' denotes Advanced Framed Ceiling.
3.	Requirement applicable only to single rafter or joist vaulted ceilings.
4.	Below grade walls shall be insulated either on the exterior to a minimum level of R-12, or on the interior to the same level as walls above grade. Exterior insulation installed on below grade walls shall be a water resistant material, manufactured for its intended use, and installed according to the manufacturer's specifications. See Section 602.2.
5.	Floors over crawl spaces or exposed to ambient air conditions.
6.	Required slab perimeter insulation shall be a water resistant material, manufactured for its intended use, and installed according to manufacturer's specifications. See Section 602.4.
7.	Reserved.
8.	This wall insulation requirement denotes R-19 wall cavity insulation plus R-5 foam sheathing.
9.	This wall insulation requirement denotes R-19 wall cavity insulation plus R-7.5 foam sheathing.
10.	Doors, including all fire doors, shall be assigned default U-factors from Table 10-6C.
11.	Where a maximum glazing area is listed, the total glazing area (combined vertical plus overhead) as a percent of gross conditioned floor area shall be less than or equal to that value. Overhead glazing with U-factor of U=0.40 or less is not included in glazing area limitations.
12.	Overhead glazing shall have U-factors determined in accordance with NFRC 100 or as specified in Section 502.1.5.

TABLE 6-2B

PRESCRIPTIVE REQUIREMENTS¹**

FOR GROUP R-1 OCCUPANCY BUILDINGS OVER 5 STORIES

CLIMATE ZONE 2 • HEATING BY OTHER FUELS

Option

HVAC⁹ Equip. Effic.

Glazing Area¹¹: % of Floor

Glazing U-Factor

Door ¹⁰ U-

Factor

Ceiling²

Vaulted Ceiling³

Wall Above Grade

Wall• int⁴ Below Grade

Wall• ext⁴ Below Grade

Floor⁵

Slab⁶ on Grade

Vertical

Over head¹²

Med.

10%

0.70

0.64

0.40

R-38

R-30

R-19

R-12

R-25

R-10

II.

Med.

12%

0.65

0.64

0.40

R-38

R-30

R-19

R-12

R-25

R-10

III.

High

17%

0.65

0.64

0.40

R-38

R-30

R-19

R-12

R-25

R-10

IV.*

Med.

17%

0.60

0.64

0.40

R-38

R-30

R-19

R-12

R-30

R-10

Low

17%

0.50

0.64

0.40

R-38

R-30

R-19

R-12

R-30

R-10

VI.

Med.

21%

0.50

0.64

0.40

R-38

R-30

R-19

R-12

R-30

R-10

VII.⁷

Med.

25%

0.40⁷

0.64

0.40

R-38

R-30

R-19

R-12

R-30

R-10

VIII.⁷

Med.

30%

0.40⁷

0.64

0.40

R-38

R-30

R-19

R-12

R-30

R-10

IX.

Med.

unlimited

0.25

0.40

R-38

R-30

R-19

R-12

R-30

R-10

*	Reference Case
**	Nominal R-values are for wood frame assemblies only or assemblies built in accordance with Section 601.1.
1.	Minimum requirements for each option listed. For example, if a proposed design has a glazing ratio to the conditioned floor area of 19%, it shall comply with all of the requirements of the 21% glazing option (or higher). Proposed designs which cannot meet the specific requirements of a listed option above may calculate compliance by Chapters 4 or 5 of this Code.
2.	Requirement applies to all ceilings except single rafter or joist vaulted ceilings. 'Adv' denotes Advanced Framed Ceiling.
3.	Requirement applicable only to single rafter or joist vaulted ceilings.
4.	Below grade walls shall be insulated either on the exterior to a minimum level of R-12, or on the interior to the same level as walls above grade. Exterior insulation installed on below grade walls shall be a water resistant material, manufactured for its intended use, and installed according to the manufacturer's specifications. See Section 602.2.
5.	Floors over crawl spaces or exposed to ambient air conditions.
6.	Required slab perimeter insulation shall be a water resistant material, manufactured for its intended use, and installed according to manufacturer's specifications. See Section 602.4.
7.	Reserved.
8.	Reserved.
9.	Minimum HVAC equipment efficiency requirement. 'Low' denotes an AFUE of 0.74. 'Med.' denotes an AFUE of 0.78. 'High' denotes an AFUE of 0.88. Minimum HVAC equipment efficiency requirement for heat pumps. 'Low' denotes an HSPF of 6.35. 'Med.' denotes an HSPF of 6.8. 'High' an HSPF of 7.7. Water and ground source heat pumps shall be considered as medium efficiency and have a minimum COP as required in Table 14-1B.
10.	Doors, including all fire doors, shall be assigned default U-factors from Table 10-6C.
11.	Where a maximum glazing area is listed, the total glazing area (combined vertical plus overhead) as a percent of gross conditioned floor area shall be less than or equal to that value. Overhead glazing with U-factor of U=0.40 or less is not included in glazing area limitations.
12.	Overhead glazing shall have U-factors determined in accordance with NFRC 100 or as specified in Section 502.1.5.

[Statutory Authority: RCW 19.27A.025, 19.27A.045. 02-01-112, § 51-11-0625, filed 12/18/01, effective 7/1/02; 01-03-010, § 51-11-0625, filed 1/5/01, effective 7/1/01; 98-03-003, § 51-11-0625, filed 1/8/98, effective 7/1/98. Statutory Authority: Chapters 19.27 and 19.27A RCW and 1994 c 226. 95-01-126, § 51-11-0625, filed 12/21/94, effective 6/30/95. Statutory Authority: Chapters 19.27, 19.27A and 34.05 RCW. 94-05-059, § 51-11-0625, filed 2/10/94, effective 4/1/94. Statutory Authority: Chapter 19.27A RCW. 92-01-140, § 51-11-0625, filed 12/19/91, effective 7/1/92.]

Reviser's note: The bracketed material preceding the section above was supplied by the code reviser's office.

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