A. Exceptions. The provisions of this code do not apply to temporary growing structures used solely for the commercial production of horticultural plants including ornamental plants, flowers, vegetables, and fruits. “Temporary growing structure” means a structure that has the sides and roof covered with polyethylene, polyvinyl, or similar flexible synthetic material and is used to provide plants with either frost protection or increased heat retention. A temporary growing structure is not considered a building for purposes of this code.

The provisions of this code do not apply to the construction, alteration, or repair of temporary worker housing except as provided by rule adopted under Chapter 70.114A RCW or Chapter 37, Laws of 1998 (SB 6168). “Temporary worker housing” means a place, area, or piece of land where sleeping places or housing sites are provided by an employer for his or her employees or by another person, including a temporary worker housing operator, who is providing such accommodations for employees, for temporary, seasonal occupancy, and includes “labor camps” under RCW 70.54.110.

B. International Residential Code Table R301.2 is hereby amended to read as follows:

Table R301.2. CLIMATIC AND GEOGRAPHIC DESIGN CRITERIA

GROUND	WIND DESIGN				SEISMIC	SUBJECT TO DAMAGE FROM			ICE BARRIER	FLOOD	AIR	MEAN
SNOW LOAD apsf)	Speed b (mph)	Topographic effectsc	Special wind region	Windborne debris zone	DESIGN CATEGORY	Weatheringd	Frost line depthe	Termite	UNDERLAYMENT REQUIRED	HAZARDf	FREEZING INDEX	ANNUAL TEMP
25	98	Yes	No	No	D2	Moderate	18”	Slight to Moderate	No	See footnotef	170	51°F
MANUAL J DESIGN CRITERIA
Elevation	Altitude correction factor		Coincident wet bulb		Indoor winter design dry- bulb temperature		Indoor winter design dry- bulb temperature		Outdoor winter design dry- bulb temperature		Heating temperature difference
350 feet	0.99		66°F		72°F		72°F		24 °F		48°F
Latitude	Daily Range		Indoor summer design relative humidity		Summer design gains		Indoor summer design dry-bulb temperature		Outdoor summer design dry-bulb temperature		Cooling temperature difference
47°32’27’’	M		50%		5		75°F		83°F		8°F

aDesign snow loads shall be determined by the Issaquah Ground Snow Load Map in accordance with King County Public Rule 16-04 Structural Loading: Minimum Roof Snow Loads. P_g=C_g *h_msl where P_g = ground snow load, C_g = ground snow load coefficient determined by interpolating the isolines established in the “King County Ground Snow Load Map,” and h_msl = site elevation in feet above sea level, but the design roof snow load shall not be less than 25 psf.

bThe basic wind speed is determined from the basic wind speed map in Figure R301.2(2) and reflects the ultimate design wind speed. Wind exposure category shall be determined on a site-specific basis in accordance with Section R301.2.1.4 or by the Engineer of Record

cTopographic effects (Wind Speed-up Kzt factor) shall be determined on a site-specific basis in accordance with Section R301.2.1.5 or by the Engineer of Record.

dWeathering may require a higher strength concrete or grade of masonry than necessary to satisfy the structural requirements of this code. The grade of masonry units shall be determined from ASTM C34, C55, C62, C73, C90, C129, C145, C216 or C652.

eThe frost line depth may require deeper footings. Designer to verify if deeper frost depth is required based on geotechnical reports and studies.

fThe City of Issaquah participates in the National Flood Insurance Program (NFIP), participation number CID 530079. Areas of special flood hazard shall be determined per Issaquah Municipal Code Chapter 16.36.

C. Amend IRC Section AV107.1, Where fire sprinklers are required, to read:

AV107.1 Where fire sprinklers are required. An approved automatic fire sprinkler system shall be installed in accordance with Appendix U – Dwelling Unit Fire Sprinkler Systems in new and existing one- family and two-family dwellings and townhouses for the following conditions:

A dwelling unit sprinkler system shall be installed throughout all newly constructed one-family and two- family dwellings and townhouses where the total floor area exceeds 5,000 square feet including basements. A dwelling unit sprinkler system shall also be installed throughout existing buildings when an addition is made to the building and the total floor area, including the basements, of the existing building and the addition combined exceeds 5,000 square feet, or when the value of the alteration or repair of an existing building 5,000 square feet in area or greater exceeds 50 percent of the valuation of such existing building as determined in accordance with Construction Administrative Code Section 109.4. For purposes of this section, portions of buildings separated by one or more fire walls or common walls shall not be considered a separate building. To the extent this section conflicts with any other provision of the International Building Code, International Residential Code, or the International Fire Code adopted by the City, this section shall control.