Ontario Municipal Code Art. 2 Building Requirements for New Residential Construction in the 70 CNEL to 75…

(a) New walls that form the exterior portion of habitable rooms shall be constructed as follows:

(1) Studs shall be at least four (4) inches in nominal depth;

(2) Exterior finish shall be stucco, minimum seven-eighths () inch thickness, brick veneer, masonry, or any siding material allowed by this Code. Wood or metal siding shall be installed over one-half (½) inch solid sheathing;

(3) Masonry walls with a surface weight of less than forty (40) pounds per square foot will require an interior supporting studwall that is finished as required by subsection (a)(6) of this section;

(4) Wall insulation shall be at least R-11 glass fiber or mineral wool and shall be installed continuously throughout the stud space;

(5) Exterior solid sheathing shall be covered with overlapping asphalt felt;

(6) Interior wall finish shall be at least five- eighths ( 5/8 ) inch thick gypsum wallboard or plaster.

(§ 2, Ord. 2616, eff. June 20, 1996)

(a) Openable windows. An openable windows in the exterior walls of habitable rooms shall have a laboratory sound transmission class rating of at least STC forty (40) dB and shall have an air infiltration rate of no more than 5 cubic feet per minute when tested according to ASTM E-283.

(b) Fixed windows. All fixed windows in the exterior walls of habitable rooms shall:

(1) Have a sound transmission class rating of at least STC forty (40) dB; or

(2) Shall be five-eighths ( 5/8 ) inch laminated glass with an STC rating of forty (40) dB and shall be set in nonhardening glazing materials.

(3) Shall be glass block at least three and one-half (3½) inches thick.

(c) The total areas of glazing in rooms used for sleeping shall not exceed twenty (20) percent of the floor area.

(§ 2, Ord. 2616, eff. June 20, 1996)

(a) Exterior hinged doors to habitable rooms that are directly exposed to aircraft noise and are facing the source of the noise shall be a door and edge seal assembly that has a laboratory sound transmission class of at least STC forty (40) dB.

(b) Exterior hinged doors to habitable rooms that are not directly exposed to aircraft noise and do not face the source of the noise shall have a minimum STC rating of thirty-five (35) dB.

(c) Sliding glass doors at habitable rooms shall not be allowed in walls that are directly exposed to aircraft noise. Sliding glass doors in walls that are not directly exposed shall have an STC rating of at least forty (40) dB.

(d) Access doors from a garage to a habitable room shall have an STC rating of at least thirty (30) dB.

(§ 2, Ord. 2616, eff. June 20, 1996)

(a) Roof rafters shall have a minimum slope of 4:12 and shall be covered on their top surface with one-half (½) inch solid sheathing and any roof covering allowed by this Code.

(b) Attic insulation shall be batt or blown-in glass fiber or mineral wool with a minimum R-30 rating applied between the ceiling joists.

(c) Attic ventilation shall be:

(1) Gable vents or vents that penetrate the roof surface that are fitted with transfer ducts at least six (6) feet in length that are insulating flexible ducting or metal ducts containing internal one (1) inch thick coated fiberglass sound-absorbing duct liner. Each duct shall have a lined ninety (90) degree bend in the duct so that there is no direct line-of-sight from the exterior through the duct into the attic; or

(2) Noise control louver vents; or

(3) Eave vents that are located under the cave overhang.

(d) Ceilings shall be finished with gypsum board or plaster that is at least five-eighths ( 5/8 ) inch thick. Ceiling materials shall be mounted on resilient channels.

(e) Skylights shall penetrate the ceiling by means of a completely enclosed light well that extends from the roof opening to the ceiling opening. A secondary openable glazing panel shall be mounted at the ceiling line or at a point that provides at least a four (4) inch space between the skylight glazing and the secondary glazing and shall be glazed with at least three-sixteenths (3/16) inch plastic or laminated glass. The weather-side skylight shall be any type that is permitted by the Building Code. The size of skylights shall be no more than twenty (20) percent of the roof area of the room.

(§ 2, Ord. 2616, eff. June 20, 1996)

The floor of the lowest habitable rooms shall be concrete slab on grade. Wood framed floors for habitable rooms will be allowed when they are directly above another habitable room, a basement, garage, workshop, utility room or other nonhabitable rooms that are completely enclosed with wall materials allowed by this Code.

(§ 2, Ord. 2616, eff. June 20, 1996)

(a) A ventilation system shall be provided that will provide at least the minimum air circulation and fresh air supply requirements of this Code in each habitable room without opening any window, door or other opening to the exterior. All concealed ductwork shall be insulated flexible glass fiber ducting that is at least ten (10) feet long between any two points of connection.

(b) Kitchen cooktop vent hoods shall be the nonducted recirculating type with no ducted connection to the exterior.

(§ 2, Ord. 2616, eff. June 20, 1996)

Each fireplace shall be fitted with a damper at the top of the chimney that is operated from the firebox and shall have glass doors across the front of the firebox.

(§ 2, Ord. 2616, eff. June 20, 1996)

Openings in the shell of the residence which degrade its ability to achieve an interior CNEL rating of forty-five (45) dB or less when all doors and windows are closed are prohibited unless access panels, pet doors, mail delivery drops, air- conditioning, or other openings are designed to maintain the forty-five (45) CNEL (or less) standard in the room to which they provide access.

(§ 2, Ord. 2616, eff. June 20, 1996)