§ 15.06.030. Amendments.

The following amendments, additions and deletions are made to the International Residential Code:

A.

Section R101.1 Title is amended to read in its entirety as follows:

R101.1 Title. These provisions shall be known as the Residential Code for one- and two-family dwellings of the Town of Castle Rock and shall be cited as such and will be referred to herein as "this residential code."

B.

Section R105.2, Item 2, is amended to read as follows:

Fences not over 6-feet (1829 mm) high.

C.

Section R202 Definitions. The following definition is hereby added to Section 202, Definitions:

DECORATIVE COATINGS. A single coat of plaster, cementious or other approved material applied to a concrete or masonry surface for aesthetic purposes only.

D.

Section R301.2 Climatic and Geographic Design Criteria. Table R301.2 (1) is amended to read as follows:

Table R301.2(1)
Climatic and Geographic Design Criteria

Ground Snow Load	Wind Speed (mph)	Seismic Design Category	Subject to Damage From			Decay	Winter Design Temp	Ice Shield Required	Flood Hazards	Air Freezing Index	Mean Annual Temp
			Weather- ing	Frost Line Depth	Termite
Elevation Range: 5,000'—5,999': 30 lbs. psf 6,000'—6,499': 35 lbs. psf 6,500'—7,000': 40 lbs. psf >7,000: 45 lbs. psf		B	Severe	36"	Slight to moderate	None to slight	Per IPC Table D101 Appx D	No	Per zoning	867	48.1 F
	3-second gust (V3s) 90 mph (> 7,000' 100 mph)		Rain 2"/hr
	Fastest mile (V fm ) 76

 

E.

Section R302 Fire Resistant Construction. Table R302.1(1) is amended to read as follows:

Table R302.1 (1)
Exterior Walls

Exterior Wall Element		Minimum Fire-Resistance Rating	Minimum Fire Separation Distance
Walls	(Fire-resistance rated)	1 hour - tested in accordance with ASTM E 119 or UL 263 with exposure from both sides	< 5 feet
	(Not fire-resistance rated)	0 hours	≥ 5 feet
Projections	(Fire-resistance rated)	1 hour on the underside	2 - < 5 feet
	(Not fire-resistance rated	0 hours	5 feet
Openings	Not allowed	N/A	< 3 feet
	25% Maximum of Wall Area	0 hours	≥ 3 feet and < 5 feet
	Unlimited	0 hours	≥ 5 feet
Penetrations	All	Comply with Section R302.4	< 5 feet
		None required	≥ 5 feet

 

N/A = Not Applicable.

1. Fire separation distance of 3 feet can be used if the exterior wall cladding and trim is of noncombustible material (refer to Section R202 for definition of noncombustible).
EXCEPTION: Combustible exterior wall cladding may be used where zoning requires 10 ft. building separation.
2. Fire separation distance of 3 feet can be used if the soffit cladding and fascia board is of non-combustible material (refer to Section R202 for definition of noncombustible).
3. Distances based on property lot line to foundation of the structure or pop-out walls.

___________

F.

Section R303 LIGHT, VENTILATION, HEATING is amended as follows:

R303.1 Habitable rooms, is amended to add a new Exception 4 to read as follows:

4. The natural light requirement in basements of dwelling units or congregate residences may be reduced by 50%, except that sleeping rooms must meet the requirements of Section R310.1

G.

Section R313.1, is amended to read as follows:

R313.1 Design and Installation. Automatic residential fire sprinkler systems shall be designed in accordance with Section P2904 or NFPA 13D.

H.

Sections R313.2 and R313.2.1 are deleted in their entirety.

I.

Section R302.2, amend Townhouses Exception to read:

A common 2-hour fire resistant-rated wall assembly tested in accordance with ASTM E119 or UL263 is permitted for townhouses, if such walls do not contain plumbing or mechanical equipment, ducts or vents to the cavity of the common wall. (Remainder of section to read the same.)

J.

Section R315.1, amend Carbon monoxide alarms to read:

For new construction, an approved carbon monoxide alarm shall be installed within fifteen feet of the entrance to each bedroom in dwelling units within which fuel-fired appliances are installed and in dwelling units that have attached garages,

K.

Section R315.1.2, add an exception - where required in existing dwellings to read:

Exception: Work involving exterior surfaces of dwellings, such as the replacement of roofing or siding, or the addition or replacement of windows or doors, or the addition of a porch or deck, are exempt from the requirements of this section.

L.

Section R408.1 Ventilation is amended to read as follows:

R408.1 Ventilation. The under-floor space between the bottom of the floor joists and the earth under any building (except space occupied by a basement) shall have ventilation openings through foundation walls or exterior walls. The minimum net area of ventilation openings shall not be less than 1 square foot (0.0929 m ) for each 150 square feet (14 m ) of under-floor space area, unless the ground surface is covered by a Class 1 vapor retarder material (minimum 6 mills in thickness). When a Class 1 vapor retarder material (minimum 6 mills in thickness) is used, the minimum net area of ventilation openings shall not be less than 1 square foot (0.0929 m ) for each 1,500 square feet (140 m ) of under-floor space area. One such ventilating opening shall be within 3 feet (914 mm) of each corner of the building.

M.

Section R408.3.1 is amended to read:

1. Exposed earth is covered with a continuous Class 1 vapor retarder (minimum 6-mill. in thickness). Joints of the vapor retarder shall overlap by 6 inches (152 mm) and shall be sealed or taped. The edges of the vapor retarder shall extend at least 6 inches (152 mm) up the stem wall and shall be attached and sealed to the stem wall or insulation; and

N.

Section R501.3 is deleted in its entirety.

O.

Table R507.2.1 and Figures 507.2.1(1) are deleted in their entirety.

P.

Section R507.2.1 Placement of lag screws or bolts in deck ledgers and band joists is amended to read as follows:

Section R507.2.1 Placement of lag screws or bolts in deck ledgers and band joists. The lag screws or bolts shall be placed 2 inches (51mm) in from the bottom or top of the deck ledgers and between 2 and 5 inches (51mm and 127mm) in from the ends. The lag screws or bolts shall be staggered from the top to the bottom along the horizontal run of the deck ledger.

Q.

Section R905. Requirements For Roof Coverings, is amended by adding a new Section R905.7.5.1 Wood shingle application, to read in its entirety as follows:

R905.7.5.1 Wood shingle application. All Class C and wood shingles shall be installed per Section 1505.7, Special purpose roofs, in the International Building Code.

R.

Section N1101.3, Exception 2 is amended to read as follows:

2. Window replacements in existing structures where the framed opening size does not change.

S.

Section N1103.2.2 is amended to read as follows:

N1103.2.2 (R403.2.2) Sealing (Mandatory).

Ducts, air handlers, and filter boxes shall be sealed. Joints and seams shall comply with Section M1601.4.1 of this code.

Exceptions:

1. Air-impermeable spray foam products shall be permitted to be applied without additional joint seals.

2. Where a duct connection is made that is partially inaccessible, three screws or rivets shall be equally spaced on the exposed portion of the joint so as to prevent a hinge effect.

3. Continuously welded and locking-type longitudinal joints and seams in ducts operating at static pressures less than 2-inches of water column (500 Pa) pressure classification shall not require additional closures systems.

N1103.2.2.1 (R403.2.2.1) Sealed air handler.

Air handlers shall have a manufacturer's designation for an air leakage of no more than 2% of the design air flow rate when tested in accordance with ASHRAE 193.

T.

Add a new Section N1103.2.2.2 (R403.2.2.2) System Commissioning.

N1103.2.2.2 (R403.2.2.2) System Commissioning.

All forced air systems shall be tested in accordance with this section.

1. At rough prior to concealment of any ductwork or equipment.

1.1. Total leakage shall be less than or equal to 4 cfm (113.3 L/min) per 100 square feet (9.29 m2) of conditioned floor area when tested at a pressure differential of 0.1 inches w.g. (25 Pa) across the entire system, including the manufacturer's air handler enclosure.

1.2 Flows to each supply register shall be measured and shall be within ± 20% of the design flows. (The highest design air flow shall be used for measurement.)

1.3 Total static pressure shall not be more than the Manual D design.

Exception: On homes where the same plan is built multiple times, only the first time the plan is built is rough commissioning required.

2. At final and prior to the issuance of a certificate of occupancy.

2.1 Flows to each supply register shall be measured and shall be within ± 20% of the design flows. (The highest design air flow shall be used for measurement).

2.2 Total static pressure shall not be more than the Manual D design.

2.3 Room to core pressures shall not be more than ± 3 pa. (pascals).

2.4 Temperature rise shall be within manufacturer's specifications.

Exception: On homes where the same plan is built multiple times, only the first time the plan is built is final commissioning required.

U.

Add subparagraph #8 to M1601.1.1, to read:

8. Approved flexible air duct connectors shall be used for residential toilet room and bathroom exhaust only.

V.

Section G2407.6, Outdoor combustion air, is amended to read in its entirety as follows:

G2407.6 Outdoor combustion air. Outdoor combustion air shall be provided through openings to the outdoors in accordance with Section G2407.6.1 or G2407.6.2 and shall be done in a manner which is approved . The minimum dimension of air openings shall be not less than 3 inches (76 mm).

W.

Section G2415.12, Minimum burial depth, is amended to read in its entirety as follows:

G2415.12 Minimum burial depth. Horizontal metallic piping shall have at least 12 inches of earth cover or equivalent protection. Plastic gas piping shall have at least 18 inches of earth cover or equivalent protection.

X.

Section G2417.4.1, Test pressure, is amended to read in its entirety as follows:

G2417.4.1 Test pressure. The test pressure to be used shall be no less than 1½ times the proposed maximum working pressure but not less than 10 psi.

Y.

Section G2432, Decorative Appliances for Installation in Fireplaces, is amended to add a new Section G2432.1.1, Vented fireplace, to read as follows:

G2432.1.2 Vented fireplace. Within the vented fireplace, the damper must be removed or welded open and a glass door installed over the fireplace opening.

Z.

Section E3902.13 Arc-fault circuit interrupter protection for branch circuit extensions or modifications. Item 1 is amended to read as follows:

1. A combination-type AFCI located at the origin of the branch circuit (if there is room in the panel).

AA.

Appendix J, Section AJ102.4 Replacement Windows is amended to read as follows:

AJ102.4 Replacement Windows. Windows that are being replaced that do not alter the framing are exempt from a building permit.

AB.

Appendix J, Section AJ501.5.3 Additional Electrical Requirements is amended by the addition of a new section AJ501.5.3.6 to read as follows:

AJ501.5.3.6 Number of openings. General purpose and lighting outlet openings on an existing residence shall not be limited to 4 receptacles on a kitchen appliance circuit or 10 on a 15-amp circuit or 13 on a 20-amp circuit. Rather, the number of openings shall be governed by the calculations in the NEC.

Exception: Full or partial basement finishes.

( Ord. No. 2015-06, § 2, 2-17-2015 ;

Ord. 2012-16 §1, 2012)