Petaluma Municipal Code Ch. 3 Building Planning

Section R301.2 is amended by inserting the following Table R301.2(1).

Table R301.2(1). CLIMATIC AND GEOGRAPHIC DESIGN CRITERIA

0 GROUND SNOW LOADo

WIND DESIGN

(mph)d 110

Topographick NO

NO Special windl

Windbornem N/A

D2 or E
SEISMIC DESIGN CATEGORYf Reference Table R301.2.2.1.1

See mapping tools: www.seismicmaps.org

SUBJECT TO DAMAGE FROM

Weatheringa Negligible

12 inches Frost line depthb

Termitec Yes

32 degrees F WINTER DESIGN TEMPe

ICE BARRIER UNDERLAYMENT NO
REQUIREDh

Initial NFIP Map Date: March 8, 1974.

Initial FIRM date: February 15, 1980.

Current Flood Insurance Study dated: February

19, 2014.
FLOOD HAZARDSg
Panels 982, 1001, 1002, 1003, and 1004 are dated

October 2, 2015.

Panels 891, 893, 894, and 913 are dated February

19, 2014.

1 degree F AIR FREEZING INDEXi

58 degrees F MEAN ANNUAL TEMPj

MANUAL J DESIGN CRITERIAn

Altitude Indoor Design Heating
Winter Summer
Elevation Latitude correction design temperature temperature
heating cooling
factor temperature cooling diMerence

87 FT 38 29 90 N/A 68 degrees F. 75 degrees F. 39 degrees F.

degrees degrees degrees

North. F. F.

Cooling Wind Wind Coincident Daily Winter Summer temperature velocity velocity — wet bulb range humidity humidity diMerence heating cooling

15 degrees F. N/A N/A 67 degrees High. 31 N/A N/A —

F. degrees

F.

For SI: 1 pound per square foot = 0.0479 kPa, 1 mile per hour = 0.447 m/s.

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 Zlled in with the weathering index, “negligible,” “moderate” or

“severe” for concrete as determined from Figure R301.2(4). The grade of masonry units shall be

determined from ASTM C34, C55, C62, C73, C90, C129, C145, C216 or 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 Zll in the frost line

depth column with the minimum depth of footing below Znish grade.

c The jurisdiction shall Zll 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 Zll in this part of the table with the wind speed from the basic wind speed

map [Figure R301.2(5)A]. Wind exposure category shall be determined on a site-speciZc basis in

accordance with Section R301.2.1.4.

e The outdoor design dry-bulb temperature shall be selected from the columns of 97-1/2

-percent values for winter from Appendix D of the International Plumbing Code. Deviations from

the Appendix D temperatures shall be permitted to re[ect local climates or local weather

experience as determined by the building o\cial. [Also see Figure R301.2(1).]

f The jurisdiction shall Zll in this part of the table with the seismic design category determined

from Section R301.2.2.1.

g The jurisdiction shall Zll in this part of the table with (a) the date of the jurisdiction’s entry into

the National Flood Insurance Program (date of adoption of the Zrst code or ordinance for

management of [ood hazard areas), (b) the date(s) of the Flood Insurance Study and (c) the panel

numbers and dates of the currently e]ective FIRMs and FBFMs or other [ood hazard map

adopted by the authority having jurisdiction, as amended.

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 e]ects of ice damming, the

jurisdiction shall Zll in this part of the table with “YES.” Otherwise, the jurisdiction shall Zll in this

part of the table with “NO.”

i The jurisdiction shall Zll 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 “Air Freezing Index-USA Method (Base 32°F).”

j The jurisdiction shall Zll 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°F).”

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 e]ects, the jurisdiction shall Zll

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(5)A, where there is local historical data documenting unusual

wind conditions, the jurisdiction shall Zll in this part of the table with “YES” and identify any

speciZc 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(s). Otherwise, the jurisdiction shall indicate “NO” in this part of the table.

n The jurisdiction shall Zll in these sections of the table to establish the design criteria using Table

1a or 1b from ACCA Manual J or established criteria determined by the jurisdiction.

o The jurisdiction shall Zll in this section of the table using the Ground Snow Loads in Figure

R301.2(6).

Section R309.1 is amended, with the exceptions replaced as follows:

R309.1 Townhouse automatic Kre sprinkler systems. An automatic residential Zre sprinkler system

shall be installed in townhouses.

Exceptions:

1. Accessory Dwelling Unit, provided that all of the following are met:

507.5.1.

2. Detached accessory structures to Group R-3 not classiZed as a dwelling unit and not exceeding 1,000

square feet in gross [oor area located at least 50 feet from applicable building.

3. Detached Group U Occupancies not greater than 1,000 square feet.

Section R309.1.2 is added as follows:

R309.1.2 Substantial Remodel. An automatic Zre sprinkler system shall be provided throughout all

Townhouses that undergo a substantial improvement.

Section R309.2 is amended to read as follows, with the exception deleted:

R309.2 One- and two-family dwellings automatic Kre sprinkler systems. An automatic residential Zre

sprinkler system shall be installed in townhouses. Group R-3 occupancies permitted under this code

shall be provided throughout regardless of square footage with an automatic sprinkler system inclusive

of all mobile homes, manufactured homes.

Exceptions:

1. Accessory Dwelling Unit, provided that all of the following are met:

The accessory dwelling unit meets the requirements of California Fire Code, Sections 503.1.1 and

507.5.1.

2. Detached accessory structures to Group R-3 not classiZed as a dwelling unit and not exceeding 1,000

square feet in gross [oor area located at least 50 feet from applicable building.

3. Detached Group U Occupancies not greater than 1,000 square feet.

Section R309.2.2 is added as follows:

R309.2.2 Substantial Remodel. An automatic Zre sprinkler system shall be provided throughout all one-

and two-family dwellings that undergo a substantial improvement.