Page 57 - 2018_IRC

BUILDING PLANNING

MEAN ANNUAL TEMP j —

AIR FREEZING INDEX i — Heating temperature difference —

FLOOD HAZARDS g — — —

ICE BARRIER UNDERLAYMENT REQUIRED h — Design temperature cooling Summer humidity

WINTER DESIGN Termite c TEMP e — — Indoor design temperature — Winter humidity —

TABLE R301.2(1) CLIMATIC AND GEOGRAPHIC DESIGN CRITERIA SUBJECT TO DAMAGE FROM Frost line Weathering a depth b — — MANUAL J DESIGN CRITERIA n Altitude correction factor — Daily range — 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 inde

SEISMIC DESIGN CATEGORY f — Summer cooling — Coincident wet bulb — 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. temperatures shall be permitted to reflect local climates or local weather experience as determined by the building official. [Also see Figure R301.2(1).] m.In accordance with Section R301.2.1.2 the jurisdiction shall in

Windborne debris zone m — Winter heating — Wind velocity cooling — The jurisdiction shall fill in this part of the table with the seismic design category determined from Section R301.2.2.1. fill in this part of the table with “YES.” Otherwise, the jurisdiction shall fill in this part of the table with “NO.” The jurisdiction shall fill in this section of the table using the Ground Snow Loads in Figure R301.2(6).

WIND DESIGN Special wind region l — Lattitude — Wind velocity heating — 1 pound per square foot = 0.0479 kPa, 1 mile per hour = 0.447 m/s. from ASTM C34, C55, C62, C73, C90, C129, C145, C216 or C652. table with “YES.” Otherwise, the jurisdiction shall indicate “NO” in this part of the table. requirements. Otherwise, the jurisdiction shall indicate “NO” in this part of the table.

Topographic effects k — column with the minimum depth of footing below finish grade. Center data table “Air Freezing Index-USA Method (Base 32°F).”

Speed d (mph) — — temperature difference — with Section R301.2.1.4. jurisdiction, as amended.

GROUND SNOW LOAD o — Elevation Cooling For SI: a. b. c. d. e. f. g. h. i. j. k. l. n. o.

32 2018 INTERNATIONAL RESIDENTIAL CODE ®
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