WAC 51-11-0625 Table 6-1.

TABLE 6-1

PRESCRIPTIVE REQUIREMENTS^0,1 FOR GROUP R OCCUPANCY

CLIMATE ZONE 1

Option	Glazing Area¹⁰: % of Floor	Glazing U-Factor		Door⁹ U- Factor	Ceiling²	Vaulted Ceiling³	Wall¹² Above Grade	Wall• int⁴ Below Grade	Wall• ext⁴ Below Grade	Floor⁵	Slab⁶ on Grade
Option	Glazing Area¹⁰: % of Floor	Vertical	Overhead¹¹	Door⁹ U- Factor	Ceiling²	Vaulted Ceiling³	Wall¹² Above Grade	Wall• int⁴ Below Grade	Wall• ext⁴ Below Grade	Floor⁵	Slab⁶ on Grade
I.	10%	0.32	0.58	0.20	R-38	R-30	R-15	R-15	R-10	R-30	R-10
II.*	15%	0.35	0.58	0.20	R-38	R-30	R-21	R-21	R-10	R-30	R-10
III.	25% Group R-1 and R-2 Occupancy only	0.40	0.58	0.20	R-38/ U = 0.031	R-30/ U = 0.034	R-21/ U = 0.057	R-15	R-10	R-30/ U = 0.029	R-10
IV.	Unlimited Group R-3 and R-4 Occupancy only	0.35	0.58	0.20	R-38	R-30	R-21	R-21	R-10	R-30	R-10
V.	Unlimited Group R-1 and R-2 Occupancy only	0.35	0.58	0.20	R-38/ U = 0.031	R-30/ U = 0.034	R-21/ U = 0.057	R-15	R-10	R-30/ U = 0.029	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 complying with note 3. 'Adv' denotes Advanced Framed Ceiling.
3.	Requirement applicable only to single rafter or joist vaulted ceilings where both (a) the distance between the top of the ceiling and the underside of the roof sheathing is less than 12 inches and (b) there is a minimum 1-inch vented airspace above the insulation. Other single rafter or joist vaulted ceilings shall comply with the "ceiling" requirements. This option is limited to 500 square feet of ceiling area for any one dwelling unit.
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-10 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.

TABLE 6-2

PRESCRIPTIVE REQUIREMENTS^0,1 FOR GROUP R OCCUPANCY

CLIMATE ZONE 2

Option	Glazing Area¹⁰: % of Floor	Glazing U-Factor		Door⁹ U- Factor	Ceiling²	Vaulted Ceiling³	Wall¹² Above Grade	Wall• int⁴ Below Grade	Wall• ext⁴ Below Grade	Floor⁵	Slab⁶ on Grade
Option	Glazing Area¹⁰: % of Floor	Vertical	Overhead¹¹	Door⁹ U- Factor	Ceiling²	Vaulted Ceiling³	Wall¹² Above Grade	Wall• int⁴ Below Grade	Wall• ext⁴ Below Grade	Floor⁵	Slab⁶ on Grade
I.	12%	0.35	0.58	0.20	R-38	R-30	R-21 Int⁷	R-21	R-12	R-30	R-10
II.*	15%	0.35	0.58	0.20	R-38	R-30	R-19 +R-5⁸	R-21	R-12	R-30	R-10
III.	17%	0.32	0.58	0.20	R-38	R-30	R-19 +R-5⁸	R-21	R-12	R-30	R-10
IV.	25% Group R-1 and R-2 Occupancy only	0.35	0.58	0.20	R-38/ U = 0.031	R-30/ U = 0.034	R-21 int⁷/ U = 0.054	R-15	R-12	R-30/ U = 0.029	R-10/ F = 0.54
V.	Unlimited Group R-3 and R-4 Occupancy only	0.35	0.58	0.20	R-38	R-30	R-19 +R-5⁸	R-21	R-12	R-30	R-10
VI.	Unlimited Group R-3 and R-4 Occupancies only	0.30	0.58	0.20	R-49 or R-38 ADV	R-38	R-21 int⁷	R-21	R-12	R-30	R-10
VII.	Unlimited Group R-1 Occupancy only	0.32	0.58	0.20	R-38/ U = 0.031	R-30/ U = 0.034	R-21 int⁷/ U = 0.054	R-15	R-12	R-30/ U = 0.029	R-10/ F = 0.54

*	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 complying with note 3. 'Adv' denotes Advanced Framed Ceiling.
3.	Requirement applicable only to single rafter or joist vaulted ceilings where both (a) the distance between the top of the ceiling and the underside of the roof sheathing is less than 12 inches and (b) there is a minimum 1-inch vented airspace above the insulation. Other single rafter or joist vaulted ceilings shall comply with the "ceiling" requirements. This option is limited to 500 square feet of ceiling area for any one dwelling unit.
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.	Int. denotes standard framing 16 inches on center with headers insulated with a minimum of R-10 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.

[Statutory Authority: RCW 19.27A.022, 19.27A.025, 19.27A.045, and chapters 19.27 and 34.05 RCW. 07-01-089, § 51-11-0625, filed 12/19/06, effective 7/1/07. Statutory Authority: RCW 19.27A.020, 19.27A.045. 04-01-106, § 51-11-0625, filed 12/17/03, effective 7/1/04; 02-24-076, § 51-11-0625, filed 12/4/02, effective 5/1/03. 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.]