Washington Administrative Code › Title 51 - Enterprise Services, Department of (Building Code Council) › Chapter 51-11C - State Building Code adoption and amendment of the 2021 edition of the International Energy Conservation Code, Commercial › Section 51-11C-40600 - Section C406-Efficiency and load management measures

Current through Register Vol. 24-14, July 15, 2024
C406.1
Additional
			 energy efficiency and load management measures credit requirements.
The
			 project as defined in the building permit shall meet the following requirements
			 as applicable:
1. New buildings, changes in
space conditioning category
, change of occupancy group, and
			 building additions in accordance with Chapter 5 shall comply with sufficient
			 measures from Section C406.2 so as to achieve the minimum number of required
			 efficiency credits shown in Table C406.1.
2. New buildings greater than 5000 gross
			 square feet of floor area shall comply with sufficient measures from Section
			 C406.3 so as to achieve the minimum number of required load management credits
			 shown in Table C406.1.
3. Tenant
			 spaces shall comply in accordance with Section C406.1.1.
4. Projects using discrete area credit
			 weighting shall comply in accordance with Section C406.1.2.
EXCEPTIONS:
1. Low energy spaces in accordance with Section
						  C402.1.1.1, equipment buildings in accordance with Section C402.1.2,
						  unconditioned spaces, open parking garages, and enclosed parking garages that
						  comply with sufficient measures from Table C406.2(1) to achieve a minimum of 50
						  percent of the efficiency credits required for new construction. Such projects
						  shall be exempt from the load management requirements in Table C406.1.
2. Building additions that have less than 1,000 square
						  feet of
conditioned floor area
that comply with sufficient
						  measures from Table C406.2(1) to achieve a minimum of 50 percent of the
						  efficiency credits required for additions.
3. Warehouses are exempt from the load management
						  credit requirements in Table C406.1.
Table C406.1 Energy Measure Credit
				Requirements
Required Credits for
						  Projects
Section
Occupancy Group
Group R-1
Group R-2
Group B
Group E
Group M
All Other
New building energy efficiency credit
						  requirement
C406.2
54
41
42
48
74
49
Building additions energy efficiency credit
						  requirement
C406.2
27
20
21
23
36
21
New building load management credit
						  requirement
C406.3
12
15
27
15
13
26
C406.1.1
Tenant spaces.
An
			 initial tenant improvement shall comply with sufficient measures from Table
			 C406.2(1) to achieve a minimum of efficiency credits required in Table C406.1
			 and are not required to achieve any load management credits. In projects with
			 multiple tenant spaces, each tenant space is permitted to apply for different
			 measures provided the weighted average of all areas in the project comply with
			 the overall efficiency credit requirement in Table C406.1. Whole building or
			 addition energy credits shall be allocated to tenant spaces in accordance with
			 Sections C406.1.1.1 and C406.1.1.2.
EXCEPTIONS:
1. An initial tenant improvement where the core and
						  shell building complied via Section C407 in 2018 or later edition of the
						  Washington State Energy Code.
2. Previously occupied tenant spaces in existing
						  buildings that comply with this code in accordance with Section C501.
C406.1.1.1
Applicable envelope, renewable and elevator energy credits.
Where an entire building or building addition complies with
				Section C406.2.4, C406.2.9, C406.2.10, or C406.2.14, under an initial tenant
				improvement permit, tenant spaces within the building qualify for the number of
				credits assigned to the occupancy group of the tenant space in accordance with
				Table C406.2(1). Where prior energy credits were achieved under the 2018
				Washington State Energy Code, they shall be multiplied by 6 for applicability
				to this code.
C406.1.1.2
Applicable HVAC and service water heating credits.
Where HVAC and
			 service water heating systems and services are installed and comply with
			 Section C406.2.4, C406.2.9, C406.2.10, or C406.2.14 under an initial tenant
			 improvement permit, those systems and services shall be considered a part of
			 the tenant space. Tenant spaces qualify for the credits assigned to the
			 occupancy group of the tenant space in accordance with Table C406.2(1) if the
			 tenant space includes the distribution system and equipment that the central
			 HVAC systems or service water heating systems were designed to
			 support.
C406.1.2
Discrete area-weighted project compliance.
Discrete building areas
			 are permitted to select different packages of measures provided that the whole
			 project complies with both the energy and load management credit requirements.
			 Compliance shall be determined as follows:
1.
			 Required project credits shall be prorated on an area-weighted basis for each
			 occupancy group by multiplying the occupancy group floor area by the number of
			 credits required, and then dividing this value by the total area of all the
			 occupancy groups combined. Where one occupancy group is less than 10 percent of
			 the floor area of the project, use the primary occupancy group for those
			 credits.
2. Occupancies are
			 permitted to be subdivided into discrete areas, with required and achieved
			 credits for each area prorated on an area-weighted basis as required for the
			 occupancy group.
3. Where envelope
			 or lighting power credits in Section C406.2.3.1, C406.2.3.2, or C406.2.3.12 are
			 applied, the lighting power or envelope UA percentage reduction shall be
			 calculated for the project as a whole to determine achieved credits.
4. Determine total project credits achieved
			 by area-weighting the achieved credits by occupancy group in the same manner as
			 for required project credits.
5. A
			 project complies when the achieved number of area-weighted energy and load
			 management credits are equal to or greater than the required area-weighted
			 number of credits.