Wash. Admin. Code § 51-11C-50200 - Section C502-Additions
C502.1
General.
Additions to an existing building,
building system or portion thereof shall conform to the provisions of this code
as they relate to new construction without requiring the unaltered portion of
the existing building or building system to comply with this code.
Additions shall not create an unsafe or hazardous condition or
overload existing building systems. An addition shall be
deemed to comply with this code if the addition alone complies
or if the existing building and addition comply with this code
as a single building.
This allowance applies to prescriptive compliance in accordance with Section C502.2 or total building performance in accordance with Section C407.
C502.1.1
Additional energy efficiency credits. Additions shall comply with
Section C406.1. The addition shall be deemed to comply with this section if the
addition alone complies or if the addition area is combined with existing
building areas to demonstrate compliance with an additional efficiency
credit.
C502.1.2
Renewable
energy. Additions shall comply with Section C411. The addition shall be
deemed to comply with this section if the addition alone complies or if the
addition area is combined with existing building areas to demonstrate
compliance with the requirements for on-site renewable energy or solar
readiness, as applicable.
C502.2
Prescriptive compliance.
Additions shall comply with Sections C502.3 through C502.8.
C502.2.2
Skylights.
Additions with skylights shall comply with
the following:
1. Where an
addition with skylight area results in a total building
skylight area less than or equal to the maximum allowed by Section C402.4.1,
the addition shall comply with Section C402.4.
2. Where an addition with
skylight area results in a total building skylight area greater than the
maximum allowed by Section C402.4.1 (regardless of the ratio prior to the
addition), the addition shall comply with one
of the following:
2.1. Component performance
alternative with target area adjustment per Section C402.1.5 for the addition
area of the building only.
2.2.
Existing building and addition area are combined to demonstrate compliance with
the component performance alternative for the whole building.
U-factors applied to existing envelope assemblies in the UA
calculation shall comply with Section C501.2.1.
2.3. Total building performance in accordance
with Section C407 for the addition area of the building only.
2.4. Total building performance for the whole
building.
C502.2.4
Building mechanical
systems. New mechanical systems and equipment serving the building
heating, cooling or ventilation needs, that are installed as a part of the
addition shall comply with Sections C403, C408.2, C409.5, and
C501.6.
C502.2.5
Service
water heating systems. New service water-heating systems and equipment
that are installed as a part of the addition shall comply with
Sections C404, C408.3, C409.5, and C501.6.
C502.2.6
Pools and permanent spas.
Systems and equipment serving new pools and permanent spas that are
installed as a part of the addition shall comply with Sections
C404.11, C408.3, C409.5, and C501.6.
C502.2.7
Electrical power and lighting
systems and motors. New electrical power and lighting systems and motors
that are installed as a part of the addition shall comply with
Sections C405, C408.4, C409.5, and C501.6.
C502.2.7.1
Interior lighting power.
The total interior lighting power for the addition shall comply with
Section C405.4.2 for the addition alone, or the existing building and the
addition shall comply as a single building.
C502.2.7.2
Exterior lighting power.
The total exterior lighting power for the addition shall comply with
Section C405.5.2 for the addition alone, or the existing building and the
addition shall comply as a single building.
C502.2.8
Refrigeration systems.
New refrigerated spaces and refrigeration systems and equipment that are
installed as a part of the addition shall comply with Sections
C408.7, C409.5, C410, and C501.6.
C502.3
Building envelope.
Additions shall comply with Sections C402.1 through C402.5, C502.3.1, and
C502.3.2.
C502.3.1
Vertical
fenestration. Additions with vertical fenestration
shall comply with the following:
1. Where an
addition with vertical fenestration area
results in a total building vertical fenestration area less
than or equal to the maximum allowed by Section C402.4.1, the addition shall
comply with Section C402.4.
2.
Where an addition with vertical fenestration
area results in a total building vertical fenestration area greater than the
maximum allowed by Section C402.4.1 (regardless of the ratio prior to the
addition), the addition shall comply with one
of the following:
2.1. Component performance
alternative with target area adjustment per Section C402.1.5 for the addition
area of the building only.
2.2.
Existing building and addition area are combined to demonstrate compliance with
the component performance alternative for the whole building.
U-factors applied to existing envelope assemblies in the UA
calculation shall comply with Section C501.2.1.
2.3. Total building performance in accordance
with Section C407 for the addition area of the building only.
2.4. Total building performance for the whole
building.
Notes
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No prior version found.