Rule 516.
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
|
Wind
Speedd
(mph)
|
Seismic Design
Categoryf
|
Subject to Damage From
|
Winter Design
Tempe
|
Ice Barrier Underlayment
Requiredh
|
Flood
Hazardsg
|
Air Freezing
Indexi
|
Mean Annual
Tempj
|
|
Weatheringa
|
Frostline
depthb
|
Termitec
|
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
areaswhere 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 figureR403.3(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
.
