Ontario Municipal Code Art. 5 Modification Requirements for Existing Residential Buildings in the 70 CNEL…

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

(1) Wood frame walls with exterior wood siding or other lightweight exterior finish shall be provided with a secondary interior stud wall that is supported at the ceiling and the floor and is separated from the surface of the interior wall by at least one-half (½) inch. The exposed surface of the secondary wall shall be finished with five-eighths ( 5/8 ) inch gypsum wallboard or plaster.

(2) Wood frame walls with an exterior finish of stucco, brick veneer or other similar materials and with an interior finish that is less than one-half (½) inch thick shall be provided with an additional interior layer of five-eighths ( 5/8 ) inch gypsum wallboard.

(3) Wood frame walls with an exterior finish of stucco, brick veneer or other similar heavy materials and with interior finish that is at least one-half (½) inch thick do not require modification.

(4) Walls that are not directly exposed to aircraft noise or that are constructed principally of load bearing masonry will not require modifications.

(§ 2, Ord. 2616, eff. June 20, 1996)

(a) Openable windows in habitable rooms shall be replaced with an openable window that has 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 in habitable rooms shall be modified by one (1) of the following methods:

(1) Replace the existing window with a window that has an acoustic rating of at least STC forty (40) dB; or

(2) Replace the existing window with five- eighths ( 5/8 ) inch laminated glass that has an acoustic rating of STC forty (40) dB;

(3) Add secondary removable glazing at the interior or exterior of the existing window. The secondary glazing shall be at least one-fourth (¼) inch float glass or laminated glass. The space between the two panes of glass shall be at least two (2) inches.

(c) Fixed windows in habitable rooms that do not face the source of aircraft noise shall be replaced with three-eighths () inch laminated glass that has an acoustic rating of at least STC thirty-six (36) dB.

(d) The joint between the wall opening and the new windows required in subsections (a) and (b)(1) of this section shall be continuously filled with glass fiber insulation and the exterior cover trim shall be continuously caulked to seal the joint.

(e) Fixed glass shall be set in nonhardening glazing materials.

(§ 2, Ord. 2616, eff. June 20, 1996)

(a) Exterior hinged doors to habitable rooms that are directly exposed to aircraft noise shall be replaced with a door and seals that have a laboratory sound transmission class rating of at least STC forty (40) dB. A new rabetted frame shall be provided for each new door to replace the existing frame.

(b) Exterior hinged doors to habitable rooms that are not directly exposed to aircraft noise shall be replaced with a door and seals that have a laboratory sound transmission class rating of at least STC thirty-five (35) dB.

(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 habitable rooms shall be fitted with a secondary sliding glass door installed on the exterior of the existing door and trimmed on all exposed sides with wood trim that is at least two (2) inches thick (nominal). Joints between the new door and the wall shall be continuously caulked.

(e) The joint between the wall opening and the new door frame required in subsections (a) and (b) of this section shall be continuously filled with glass fiber insulation and the exterior cover trim shall be continuously caulked to seal the joint.

(§ 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)

(a) Vent openings to underfloor areas of wood framed floors shall be provided with acoustic vent baffles that meet noise reduction levels shown in Table 15-A. Vent baffles shall be fitted with one-fourth (¼) inch mesh screen.

Table 15-A

Table 15-A

(b) Underfloor access doors shall be nonvented plywood or other weatherproof material.

(§ 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)