This procedure provides for non-rated site-built skylights, and alterations to fenestration (i.e., repairs or replacement of glass), with an option to comply with the Energy Standards. The Center of Glass (COG) values are required to be used in Equation NA6-1, NA6-2 and NA6-3 and shall be determined by the manufacturers in accordance with NFRC procedures. A copy of the manufacturer cut sheets or data sheet shall be provided identifying the COG values as an attachment with the Fenestration Certificate of Compliance.

1. NONRESIDENTIAL AND MULTIFAMILY BUILDINGS FOUR STORIES OR GREATER
   For Nonresidential cases, the Alternative Default Fenestration Procedure option is available for up to 200 ft2 of site-built skylight area, and alterations to vertical fenestration. The manufacturer cut sheet or data sheet shall be used to identify the COG values for the U-factor, Solar Heat Gain Coefficient (SHGCC) and Visible Transmittance (VTC). If unable to determine center of glass information, the alternative Energy Commissions Default Tables in Section 110.6 of the Energy Standards must be used to determine the appropriate fenestration default values. The values listed in Table 110.6-A for U-factors and Table 110.6-B for SHGC values are whole fenestration product values. Since there is no default Visible Transmittance value available, the alternative is VTC =1.0; this will be used to determine the total fenestration product, VTT, which includes the glass and frame of the fenestration. For Nonresidential, the altered fenestration (other than a repair) shall meet the values listed in Table 141.0-A unless the altered glass area meets the Exception to Section 141.0(b)2A in the Energy Standards. If the altered fenestration or glass alone is not rated by NFRC then the Alternate Default Fenestration Procedure can be used.
   
2. RESIDENTIAL AND MULTIFAMILY BUILDINGS THREE STORIES OR LESS
   For Residential cases, the Alternate Default Fenestration Procedure option is available only when nonrated site-built fenestration is being installed in a residential dwelling. For Residential site-built fenestration up to 250 ft² in area or 5% times the conditioned floor area (CFA), whichever is greater shall meet Sections §110.6(a)2. and §110.6(a)3.
   The Alternate Default Fenestration calculated values are typically less efficient than those listed in the Prescriptive Approach in Table 150.1-A and Table 150.1-B of the Energy Standards. The Visible Transmittance (VT) value is not required to meet residential energy compliance. If unable to acquire center of glass (COG) thermal performance values from the manufacturer, then the Energy Commissions Default Tables shall be used; Table 110.6-A for U-factors and Table 110.6-B for SHGC values and documented on the on a self-produced manufactured default label. The default label shall be attached to the unrated fenestration product. An example of the label can be found in the Residential Compliance Manual.
3. DOCUMENTATION
   1. The Energy Commission's Fenestration Label Certificate form for nonresidential application shall be used to document the Alternate Default Fenestration calculated values for each non-rated site-built fenestration unit; or
   2. For residential, a manufactured Default Label attached to each non-rated site-built fenestration unit.

The equations listed below are to be used for only for unrated site-built fenestration that meets the requirements in either item 1 or 2 above.

U_T= C₁ + (C₂ X U_c)

Where:

U_T = U-factor Is the Total Performance of the fenestration including glass and frame

C₁ = Coefficient selected from Table NA6-6

C₂ = Coefficient selected from Table NA6-6

U_C = Center of glass U-factor calculated in accordance with NFRC 100 Section 4.5.3.1 (http://www.nfrc.org/software.aspx)

The SHGC of the fenestration product shall be calculated using the following equation:

SHGC_T = 0.08 + (0.86 x SHGC_c)

Where:

   SHGC_T = SHGC Is the Total Performance of the fenestration including glass and frame

   SHGC_C = Center of glass SHGC calculated in accordance with NFRC 200 Section 4.5.1.1 http://www.nfrc.org

VT_T = VT_F x VT_C

Where:

VT_T = Is the Total Performance of the fenestration including glass and frame

VT_F = 0.53 for projecting windows, such as casement and awning windows

VT_F = 0.67 for operable or sliding windows

VT_F = 0.77 for fixed or non-operable windows

VT_F= 0.88 for curtain wall/storefront, Site-built and manufactured non-curb mounted skylights

VT_F = 1.0 for Curb Mounted manufactured Skylights

VT_C = Center of glass VT is calculated in accordance with NFRC 200 Section 4.5.1.1 or NFRC 202 for Translucent Products or NFRC 203 for Tubular Daylighting Devices and Hybrid Tubular Daylighting Devices or ASTM E972 (http://www.nfrc.org/software.aspx)

This section describes the responsibilities of energy consultants, designers, architects, builders, installers, and enforcement agencies when using the procedures of this appendix.

The person with responsibility for preparing the compliance documentation shall establish the inputs from the following:

1. The center of glass U-factor, SHGC and VT shall be taken from manufacturers’ literature and determined using methods consistent with NFRC 100, NFRC 200, NFRC 202 and NFRC 203 procedures.
2. The frame type (Metal, Metal Thermal Break, Non-metal) shall be verified from manufacturers’ literature and through observations of frame sections provided by the manufacturer.

For the Prescriptive Overall Compliance Method, the calculated values shall be entered on the prescriptive Certificate of Compliance form. In addition, the Fenestration Certificate of Compliance Label Certificate must be also filled and located at the project site location in according to Reference Nonresidential Appendix NA7.

For the Performance Compliance Approach, the calculated values shall be entered and documented on the Performance Certificates of Compliance. In addition the Fenestration Certificate of Compliance Label Certificate must be filled and located at the project site location in according to Reference Nonresidential Appendix NA7.

For both the prescriptive and performance compliance method, the building plans shall contain a window schedule that lists the calculated values in which matches the Fenestration Certificate of Compliance form or improved thermal performance values than listed on the Fenestration Certificate of Compliance form. The specifications of the windows shall be consistent with the values used in this procedure, e.g., frame type glazing product, etc.

Permit applications must include fenestration U-factor, SHGC and VT values documentation for the building plan checker. This documentation must include a copy of the manufacturer’s documentation showing the Glazing Type information (center of glass U-factor, center of glass SHGC, center of glass VT, number of panes, coatings and the frame type (frame material type, presence of thermal breaks, and identification of structural glazing (glazing with no frame)) that is used to determine UT, SHGCT, and VTT. If the proposed design uses multiple fenestration products, manufacturer’s documentation for each fenestration product shall be attached to the plans. Manufacturer’s documentation must be provided for each unique combination of glazing and frame used for compliance and shall be located at the project's location.

If mixed fenestration is included in the compliance analysis, then the compliance submittal must clearly identify which are certified fenestration products, and which are non-certified fenestration products. In nonresidential buildings, non-certified fenestration products are limited to 200 ft² of skylight area and altered vertical fenestration. In residential buildings, non-certified fenestration products are limited to 250 ft² in area, or 0.5% of the CFA, whichever is greater.

The manufacturer’s documentation and calculations for each product must be included in the submittal, and either the Prescriptive Certificate of Compliance or Performance Certificate of Compliance form must be included on the building plans. All non-certified fenestration products, including skylights, require a completed Fenestration Certificate of Compliance.

The builder must ensure that the fenestration (glass and frame) documentation showing the U factor, SHGC, and VT used for determining compliance is provided to the installer. The builder is responsible for ensuring that the persons preparing compliance documentation are specifying products the builder intends to install. The builder is responsible for ensuring that the installer installs glass with thermal performance equal to or better than the thermal performance used for energy compliance and that the frame type installed is the same as that used for compliance. The builder also must ensure that the field inspector for the enforcement agency is provided with manufacturer’s documentation attached to each Energy Commission's Fenestration Certificate of Compliance Label Certificate showing the thermal performance and method of determining thermal performance for the actual fenestration products installed. The builder should verify that these fenestration products are clearly shown on the building plans before fenestration products are purchased and installed. A copy of the manufacturer’s documentation and Fenestration Certificate of Compliance shall be located at the project location.

The enforcement agency plan checker or reviewer is responsible for ensuring that the plans identify all site-built fenestration and skylights occasionally residential site-built fenestration will be used and identified on the Fenestration Certificate of Compliance form. The plan checker shall ensure that site-built fenestration and skylights using the alternate default procedure shall meet the following:

1. Confirm that U-factors, SHGC and VT (for Commercial use only) values are clearly shown on the window schedules on the plans and documented on the energy compliance forms, and
2. Confirm that manufacturer documentation of the Glazing Type and Frame Type has been provided for the each of the fenestration products using the procedure of this appendix and documents the Center of Glass values; and
3. Verify the building meets the non-certified fenestration requirement (Nonresidential: up to 200 ft² of skylight area, or an altered vertical fenestration; Residential: up to 250 ft² in area, or 0.5% of the CFA, whichever is greater); and
4. For Nonresidential, confirm that a Fenestration Certificate of Compliance Label Certificate has been completed for each non-rated site-built fenestration product, or for Residential, verify that the non-rated site-built fenestration efficiencies match the building plans and energy compliance forms.

1. For Residential up to 250 ft² in area or 0.5% of the CFA, whichever is greater, of non-rated site-built fenestration is allowed. The inspector should verify the manufacturer’s label attached to each residential site-built fenestration product to ensure that it matches with residential energy compliance forms.
2. For Nonresidential up to 200 ft² of skylight area and altered vertical site-built fenestration are allowed for this alternative procedure. The field inspector is responsible for ensuring that the U-factor, SHGC and VT for the installed fenestration match the building plans and energy compliance forms. Inspection of the Commission’s Fenestration Certificate of Compliance Label Certificate shall match each of the Prescriptive Certificate of Compliance form or the Performance Certificate of Compliance forms for the installed site-built fenestration product.