Ontario Municipal Code Art. 6 Modification Requirements for Existing Residential Buildings in the 65 CNEL…

Exterior walls in this noise zone do not require modification.

(§ 2, Ord. 2616, eff. June 20, 1996)

(a) Openable wood frame windows in habitable rooms facing aircraft noise shall be replaced with new openable windows that have a minimum laboratory sound transmission class of at least STC thirty-five (35) dB if the existing window has:

(1) Missing or insecure glazing putty or other glazing materials; or

(2) Broken or cracked glass; or

(3) Operating sash that is not securely supported in its frame or does not close tightly against the frame.

(b) Openable wood frame windows that do not require replacement by subsection (a) of this section and that face aircraft noise shall be fitted with a secondary window that has an STC rating of at least twenty-five (25) dB. The secondary window may be mounted at the exterior or interior of the existing window and shall be completely trimmed and caulked in place.

(c) Openable metal frame windows in habitable rooms facing aircraft noise shall be replaced with new openable windows that have a minimum laboratory sound transmission class of at least STC thirty-five (35) dB if the existing window has:

(1) Jalousie louvered glass sash; or

(2) Missing or insecure glazing putty or other glazing materials; or

(3) Broken or cracked glass; or

(4) Operating sash that is not securely supported in its frame or does not close tightly against the frame.

(d) Openable metal frame windows in habitable rooms facing aircraft noise that do not require replacement by subsection (c) of this section shall be fitted with a secondary window that has an STC rating of at least twenty-five (25) dB with a spice of at least two (2) inches between the glass surfaces of the two windows. The secondary window may be mounted at the exterior or interior of the existing window and shall be completely trimmed and caulked in place.

(e) Fixed windows in habitable rooms facing aircraft noise shall be glazed with one-fourth (¼) inch glass unless they are part of an acoustic window assembly.

(f) Openable windows in habitable rooms that do not face aircraft noise shall be modified as follows:

(1) Jalousie louvered glass windows shall be replaced with windows that have a laboratory sound transmission class of at least STC thirty-five (35) dB.

(2) Windows that are not jalousie shall be fitted with a secondary window that has an STC rating of at least twenty-five (25) dB.

(g) Fixed glass windows in habitable rooms that do not face aircraft noise shall be glazed with one-fourth (¼) inch glass.

(§ 2, Ord. 2616, eff. June 20, 1996)

(a) Exterior doors in habitable rooms that are directly exposed to aircraft noise shall be modified as follows:

(1) Hollow core or lightweight doors and doors with glazed openings shall be replaced with doors that have a minimum laboratory sound transmission class of at least STC thirty-five (35) dB.

(2) Solid core or heavy panel doors shall be fitted with a drop seal at the sill and vinyl bulb seals at the jambs and head.

(b) Exterior doors in habitable rooms that are not directly exposed to aircraft noise shall be modified as follows:

(1) Hollow core or lightweight doors and doors with glazed openings shall be replaced with doors that have a minimum laboratory sound transmission class of at least STC thirty (30) dB.

(2) Solid core or heavy panel doors shall be provided with weather-stripping at the sill, head and jambs.

(c) Access doors from a garage to a habitable room shall be replaced with a door and seals that have an STC rating of at least thirty (30) dB.

(d) Sliding glass doors in this noise zone shall be glazed with one-fourth (¼) inch safety glazing.

(§ 2, Ord. 2616, eff. June 20, 1996)

(a) Accessible attics shall be insulated to achieve a minimum R-30 insulation value.

(b) Attic vents shall be modified as follows:

(1) Gable vents or vents that penetrate the roof surface shall be provided with noise control louver vents that meet the noise reduction levels shown in Table 15-A or transfer ducts that are at least six (6) feet in length. The ducts shall be of flexible insulated ducting with a bend so that there is no direct line-of-sight from the exterior through the duct into the attic.

(2) Eave vents do not require modification.

(c) Roofs with a slope of 2:12 or less and open beam ceilings shall be modified only if bearing walls are adequate to support the additional load stresses:

(1) Existing roof covering shall be removed to expose sheathing.

(2) Two (2) foot by six (6) foot rafters at twenty-four (24) inches on center shall be installed directly above the existing roof construction and supported by existing bearing walls, shall be insulated with R-19 fiberglass batts, and shall be covered with one-half (½) inch plywood sheathing.

(3) New roofing shall be installed on the new construction that can be adequately supported by the new framing and existing bearing walls.

(§ 2, Ord. 2616, eff. June 20, 1996)

Floors in this noise zone do not require modification.

(§ 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. Exposed ductwork may be sheet metal with one (1) inch fiberglass duct liner and shall have a bend in the duct to avoid direct line-of-sight through the duct.

(b) Kitchen cooktop vent hoods shall be replaced with nonducted recirculating vent hoods 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. Any access panels, pet doors, mail delivery drops, air- conditioning, or other openings must be 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)