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 DESIGN
|
SEISMIC DESIGN
CATEGORY
|
SUBJECT TO DAMAGE
FROM
|
ICE BARRIER UNDERLAYMENT
REQUIREDh
|
FLOOD
HAZARDg
|
AIR FREEZING
INDEXi
|
MEANANNUAL
TEMPj
|
|
Speedd
(mph)
|
Topographic
Effectsk
|
Special wind
regionl
|
Windborne debris
zonem
|
|
Weatherin
ga
|
Frost Line
depthb
|
Termitec
|
|
|
|
|
|
Table R301.2(4)
|
107
|
No
|
No
|
No
|
R301.2.2.1
|
Severe
|
42"
|
Figure R318.4
|
Yes
|
See
Footnoteg
|
Figure R403.3.(2)
|
See
Footnotej
|
|
MANUAL J DESIGN
CRITERIA
|
|
Elevation
|
Altitude correction
Factore
|
Coincident wet bulb
|
Indoor winter design dry-bulb
temperature
|
Indoor winter design dry bulb
temperature
|
Outdoor winter design dry-bulb
temperature
|
Heating temperature difference
|
|
-
|
-
|
-
|
-
|
-
|
-
|
|
|
Latitude
|
Daily range
|
Indoor Summer design relative
Humidity
|
Indoor Summer design relative
Humidity
|
Indoor summer design dry-bulb
temperature
|
Outdoor summer design dry-bulb
temperature
|
Cooling temperature difference
|
|
-
|
-
|
-
|
-
|
-
|
-
|
-
|
For SI: 1 pound per square foot = 0.0479 kilopascals, 1
mile per hour = 0.447 meter /second.
(a) Where weathering requires a higher
strength concrete or grade of masonry than necessary to satisfy the structural
requirements of this code, the frost line depth strength required for
weathering shall govern. The weathering column shall be filled in with the
weathering index, "negligible," "moderate," or "severe" for concrete as
determined from figure R301.2(1). The grade of masonry units shall be
determined from ASTM C34, ASTM C55, ASTM C62, ASTM C73, ASTM C90, ASTM C129,
ASTM C145, ASTM C216, or ASTM C652.
(b) Where the frost line depth requires
deeper footings than indicated in figure R403.1(1), the frost line depth
strength required for weathering shall govern. The jurisdiction shall fill in
the frost line depth column with the minimum depth of footing below finish
grade.
(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 subterranean termite
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(2). Wind exposure category shall be determined on a
site-specific basis in accordance with section R301.2.1.4.
(e) The jurisdiction shall fill in this
section of the table to establish the design criteria using table 10A from ACCA
Manual J or established criteria determined by the jurisdiction.
(f) The jurisdiction shall fill in this part
of the table with the seismic design category determined from section
R301.2.2.1.
(g) The jurisdiction
shall fill in this part of the table with the date of the jurisdiction's entry
into the National Flood Insurance Program, which is the date of adoption of the
first code or ordinance for management of flood hazard areas, and the title and
date of the currently effective Flood Insurance Study or other flood hazard
study.
(h) In accordance with
sections R905.1.2, R905.4.3.1, R905.5.3.1, R905.6.3.1, R905.7.3.1 and
R905.8.3.1, 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 percent, value
on the National Climatic Data Center data table entitled, "Air Freezing
Index-USA Method (Base 32"F)."
(j)
The jurisdiction shall fill in this part of the table with the mean annual
temperature from the National Climatic Data Center data table entitled, "Air
Freezing Index-USA Method (Base 32 degrees Fahrenheit)."
(k) In accordance with section R301.2.1.5,
where there is local historical data documenting structural damage to buildings
due to topographic wind speed-up effects, the jurisdiction shall fill in this
part of the table with "YES." Otherwise, the jurisdiction shall indicate "NO"
in this part of the table.
(l) In
accordance with figure R301.2(2), where there is local historical data
documenting unusual wind conditions, the jurisdiction shall fill In this part
of the table with "YES" and identify any specific requirements. Otherwise, the
jurisdiction shall indicate "NO" in this part of the table.
(m) In accordance with section R301.2.1.2,
the jurisdiction shall indicate the wind-borne debris wind zone or zones.
Otherwise, the jurisdiction shall indicate "NO" in this part of the
table.
(n) The jurisdiction shall
fill in these sections of the table to establish the design criteria using
table la or lb from ACCA Manual .1 or established criteria determined by the
jurisdiction.
(o) The jurisdiction
shall fill in this section of the table using the Ground Snow Loads in figures
R301.2(3) and R301.2(4).
