AMENDMENTS TO THE 1995 CABO MODEL ENERGY CODE

CHAPTER 1 - ADMINISTRATION AND ENFORCEMENT

(Add) 101.4.3.1.1 Prescriptive requirements for greenhouse and sunroom additions. As an alternative to demonstrating compliance with Sections 402, 403 or 502.2, greenhouse and sunroom additions shall meet the prescriptive envelope criteria in Table 101.4.3.1.1. R-values refer to installed insulation only. For installed components with different R- or U- values, area-weighted averages shall be used to determine compliance with Table 101.4.3.1.1. All greenhouse and sunroom additions shall be served by a heating or cooling system that is either separate and independent from that of the existing dwelling or they shall be served by a separate and independent zone of the main heating or cooling system.

Greenhouse additions that are freestanding or attached to the outside of the existing building envelope and that may be closed off from the existing dwelling through the use of opaque walls and fixed or operable doors and windows shall be 400 square feet or less in area and shall have a maximum area-weighted fenestration U-value of 0.60.

Sunroom additions that are free-standing or attached to the outside of the existing building envelope and that may be closed off from the existing dwelling through the use of opaque walls and fixed or operable doors and windows shall be 500 square feet or less in area, shall have operable windows or doors equal to a minimum of 20% of the sunroom floor area and shall have a maximum area-weighted fenestration U-value of 0.50.

Sunroom additions that are connected with an existing conditioned space via a permanent opening shall be 350 square feet or less in area and shall have a maximum area-weighted fenestration U-value of 0.45.

(Add) Table 101.4.3.1.1

Prescriptive envelope component criteria
for greenhouse and sunroom additions