Washington Administrative Code › Title 51 - Enterprise Services, Department of (Building Code Council) › Chapter 51-11R - State Building Code adoption and amendment of the 2021 edition of the International Energy Conservation Code, Residential › Section 51-11R-40100 - Section R401-General

Current through Register Vol. 24-14, July 15, 2024
R401.1 Scope.
This chapter applies to residential
				buildings. Group R-2 occupancy areas with
dwelling units
accessed from enclosed interior corridors or other enclosed interior spaces
				must comply with the Washington State Energy Code (WSEC), Commercial
				Provisions. Other Group R-2 occupancy areas are permitted to comply with the
				WSEC, Commercial Provisions, in lieu of the WSEC, Residential Provisions.
EXCEPTION:
Water heaters that each serve only an individual Group
						  R-2
dwelling unit
in a building three stories or less above
						  grade plane areev
R401.2 Compliance.
Projects shall comply with one
				of the following:
1. Sections R401
			 through R404. In addition, dwelling units and sleeping units in a
residential building
shall comply with Section R406.
2. Section R405.
3. Section R407.
R401.3 Certificate.
A permanent certificate shall
				be completed by the builder or other approved party and posted on a wall in the
				space where the furnace is located, a utility room, or an approved location
				inside the building. When located on an electrical panel, the certificate shall
				not cover or obstruct the visibility of the circuit directory label, service
				disconnect label, or other required labels. The certificate shall indicate the
				following:
1. The predominant
R
-values of insulation installed in or on ceiling/roof, walls,
			 foundation (slab,
below-grade wall
, and/or floor) and ducts
			 outside conditioned spaces.
2.
U
-factors for fenestration and the solar heat gain coefficient
			 (SHGC) of fenestration. Where there is more than one value for each component,
			 the certificate shall indicate the area weighted average value.
3. The results from any required duct system
			 and building envelope air leakage testing done on the building.
4. The results from the whole-house
			 mechanical ventilation system flow rate test.
5. The types, sizes, and efficiencies of
			 heating, cooling, whole-house mechanical ventilation, and service water heating
			 appliances. Where a gas-fired unvented room heater, electric furnace, or
			 baseboard electric heater is installed in the residence, the certificate shall
			 list "gas-fired unvented room heater," "electric furnace" or "baseboard
			 electric heater," as appropriate. An efficiency shall not be
listed
for gas-fired unvented room heaters, electric furnaces
			 or electric baseboard heaters.
6.
			 Where on-site photovoltaic panel systems have been installed, the array
			 capacity, inverter efficiency, panel tilt, orientation and estimated annual
			 electrical generation shall be noted on the certificate.
7. The code edition under which the structure
			 was permitted, and the compliance path used.
The code official may require that documentation for any
				required test results include an electronic record of the time, date, and
				location of the test. A date-stamped smart phone photo or air leakage testing
				software may be used to satisfy this requirement.
Statutory Authority:
				  RCW
				    19.27A.020,
				  19.27A.045 and
				  chapters
				  19.27 and
				  34.05 RCW. 13-04-055, §
				  51-11R-40100, filed 2/1/13, effective
				  7/1/13.