All lumber and plywood shall be pressure-preservative treated and dried after treatment in accordance with AWPA U1 (Commodity Specification A, Use Category 4B and Section 5.2), and shall bear the. We discuss engineered beams and "sandwiched" style beams. If you are building into the side of a steep hill or beside a retaining wall you will have to maintain the minimum distance to grade not only vertically but also laterally. Before sharing sensitive information, make sure youre on a federal government site. For the purpose of assessing spring load restrictions, use 29 F in lieu of 32 F. EcoGen Consultants Just as you dont want to build on poor soil where the weight of the building will cause unequal downward settling which can destroy the structure, you dont want the structure or your deck to lift up into the air unequally. Assume Day 1 start of freezing season. Alamosa, Grand, Jackson, Larimer, Moffat. A shovel and post hole digger are all that is needed to dig a deep hole, but if youve got large rocks or hard pack in your area then a long pry bar is also helpful. To this end, Figures 6 and TI ~ 0.3 (FI). For SI: 1 inch = 25.4 mm, 1 pound per square foot = 0.0479 kPa. This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. 4 bar at the top and the bottom of the footing. Montana Interactive Average Last Frost Date Map - Plantmaps Questions? In addition, this AFI Readme file provides additional documentation on the AFI tables listed below. Alaska's is the deepest at 100 inches, followed by Minnesota with 80 and North Dakota with 75. Thats why building codes specify structural footings be placed below the frost line. We have received your request and will respond promptly. ecogenconsultants.com. A survey conducted during 1985 [2.23] revealed the following from several northern states: Thus, SHAs such as Alaska, Maine, Oregon, and Washington use knowledge about expected frost depths in the design process. Other columns in the table contain lesser return periods and are listed for comparison purposes or other applications. Maximum spacings shown are the values calculated for the specified bar size. The technical publication below contains the methodology used to create the 100-year return period of the AFI. Load restrictions should be applied after accumulating a Thawing Index (TI) of about 25 F-days (based on an air temperature datum of 29 F) and must be applied at a TI of about 50 F-days (again based on an air temperature datum of 29 F). Use only the 100-year return period in this publication for FPSF. Interior covering. This map is from the National Snow and Ice Data center and shows the frost line map across the United States.