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The following energy conservation measures are required by this ordinance for a residential building; provided, however, that if the owner proves, pursuant to Section 1213, that the application of any energy conservation measure is not cost-effective, that measure shall not be required.
(a) Building containing one or two dwelling units:
(1) Ceiling insulation to a minimum resistance level of R-19 over the entire accessible attic space, provided that the existing ceiling insulation is less than R-11. Before insulation is installed in a building not meeting this standard, dropped spaces in attic floors, such as those above stairwells, shall be sealed effectively to limit air infiltration. Installation of ceiling insulation shall be required to conform to Section 719 of the Building Code (Part II, Chapter I of the San Francisco Municipal Code).
(2) Weatherstripping of all doors, unless fire-rated, which lead to unheated areas so as effectively and reliably to limit air infiltration. Doors which cannot be weatherstripped without the replacement of the entire door or doorframe are exempted from this requirement, unless the door is, for other reasons, being repaired or replaced. The Director, in the guidelines, shall specify those types of weatherstripping which are acceptable. In determining which types of weatherstripping are acceptable, the Director shall consider, among other matters, whether the weatherstripping meets the energy conservation goals of this chapter and is cost-effective.
(3) An external water heater insulation blanket with a minimum installed thermal resistance of R-6 on accessible water heaters. Installation of external water heater insulation blankets shall meet any safety standards set by the Director in the guidelines. In addition, the first four feet of accessible hot water pipe leading from the heater shall be insulated to a minimum resistance value of R-4. If foam is used to meet the R-4 standard, it shall be a closed-cell type with a minimum wall thickness of three-quarters of an inch.
(4) Caulking or sealing of all accessible major cracks and joints and other openings in building exterior to reduce the loss of heated air or the entry of outside air where feasible. Sealing of all accessible major openings from the conditioned living space into unheated areas, including, but not limited to, those found around plumbing vent pipes, electrical wiring, or furnace flue pipes.
(5) Insulating all accessible supply and return heating and cooling system ducts and plenums, which are located in unheated areas, to a minimum resistance value of R-3 and sealing of all accessible duct and plenum joints with pressure-sensitive tape or mastic.
(b) Building containing three or more dwelling units:
(1) All measures specified in Subsection (a) of this Section to the extent applicable to the structure.
(2) Insulation of all accessible recirculating hot water, steam, or steam condensate return piping throughout the structure to a minimum resistance value of R-4 and all hot water storage tanks to a minimum resistance value of R-6;
(3) Cleaning and tuning of boiler units to improve combustion efficiency. Unless the boiler has been cleaned and tuned to ensure peak combustion efficiency within the last five years and bears a tag so certifying issued by a utility inspector or contractor regularly engaged in the field of combustion efficiency, the boiler shall be cleaned and tested for combustion efficiency and appropriate adjustments made to ensure peak combustion efficiency by such a utility inspector or a contractor, who shall post a tag on or near the boiler stating that a combustion efficiency test has been performed and peak efficiency has been obtained through adjustment of the boiler's controls and cleaning where needed, and the date the test was performed. In addition, all boilers shall have the permit required by Chapter 1, Schedule 1-M of the Building Code;
(4) Repair of all hot water and steam leaks on boiler units, including replacement of defective steam traps and valves;
(5) Time clock control of burner; and
(Added by Ord. 399-89, App. 11/6/89; amended by Ord. 161-92, App. 6/4/92; Ord. 350-95, App. 11/3/95; Ord. 256-07, App. 11/6/2007; Ord. 76-09, App. 5/14/2009, Eff. 7/1/2009)