Section 408.30516. Design criteria.

Table R301.2(1) of the code is amended and figures R301.2(7) and R301.2(8) are added to the code to read as follows:

TABLE R 301.2(1)

CLIMATIC AND GEOGRAPHIC DESIGN CRITERIA

Ground Snow Load	Wi nd Sp eedd (m ph)	Seismic Design Categor yf	Subject to Damage From			Winter Design Tempe	Ice Barrier Underlaym ent Requiredh	Flood Hazard sg	Air Freezing Indexi	Mean Annual Tempj
			Weatheri nga	Frostli ne depthb	Termit ec	See Note e	Yes	See Note g	Figure R403.3(2)	See footnote J
Table R301.2( 5)	90	See Sec.R301.2. 2.1 & Figure R301.2( 2)	Severe	42” See Note b	Figure R301.2(6)

For SI: 1 pound per square foot = 0.0479 kN/m2, 1 mile per hour = 1.609 km/h.

(a)      Weathering may require a higher strength concrete or grade of masonry than necessary to satisfy the structural requirements  of this code. The weathering column shall be filled in with the weathering index (i.e., “negligible”, “moderate,” or “severe”) for concrete as determined from the weathering probability map [figure R301.2(3)]. The grade of masonry units shall be determined from ASTM C 34, C 55, C 62, C 73, C 90, C 129, C 145, C 216 or C 652 as listed in chapter 44.

(b)      The frost line depth may be modified as provided in section R403.1.4 of the code.

(c)      The jurisdiction shall fill in this part of the table to indicate the need for protection depending on whether there has been a history of local damage.

(d)      The jurisdiction shall fill in this part of the table with the wind speed from the basic wind speed map [figure R301.2(4)]. Wind exposure category shall be determined on a site-specific basis in accordance with section R301.2.1.4 of the code.

(e)      The winter design temperature criteria shall be taken from appendix D of the Michigan plumbing code, R 408.30701 to R 408.30796.

(f)      Design category determined from section R301.2.2.1 of the code.

(g)      The jurisdiction shall fill in this part of the table with both of the following:

(i)    The date of the jurisdiction’s entry into the national flood insurance program (date of adoption of the first code or ordinance for management of flood hazard areas).

(ii)    The date(s) of the currently effective FIRM and FBFM or other flood hazard map adopted by the community, as may be amended. Absent (i) or (ii), flood hazard areas as determined by the state under its administration of the Part 31, floodplain regulatory authority of the natural resources and environmental protection act, 1994 PA 451, MCL 324.101 to 324.90106, shall become the basis for regulation of floodplain development within the community and section R408.7 of the code shall apply to buildings and structures within those areas.

(h) In accordance with sections R905.2.7, R905.4.3.1, R905.5.3.1, R905.6.3.1, R905.7.3.1 and R905.8.3.1 of the code, for areas where the average daily temperature in January is 25 degrees Fahrenheit (-4 degrees Celsius) or less, or where there has been a history of local damage from the effects of ice damming, the jurisdiction shall fill in this part of the table with “YES”. Otherwise, the jurisdiction shall fill in this part of the table with “NO”.

(i)      The jurisdiction shall fill in this part of the table with the 100-year return period air freezing index (bf-days) from figure R403.3(2) or from the 100-year (99%) value on the national climatic data center data table “air freezing index-USA method (base 32 degrees Fahrenheit)”.

(j)      The jurisdiction shall fill in this part of the table with the mean annual temperature from the national climatic data center data table “air freezing index-USA method (base 32 degrees Fahrenheit)” at www.ncdc.noaa.gov/fpsf.html

History: 2001 AACS; 2008 AACS; 2010 AACS; 2015 AACS..