Maine

Statewide summary — confirm with your building department before designing

Two values were corrected by this audit. Seismic design category corrected from A to B: no location in Maine is SDC A. Every point checked from Kittery to Fort Kent bands to B or C under ASCE 7-16 at Site Class D and Risk Category II, with short-period spectral response between about 0.23 and 0.33 g. Portland, Bangor, Lewiston, Augusta, Machias and Presque Isle are all B, and Kittery and Presque Isle reach C on the long-period parameter. Ground snow load corrected from 60 to 70 psf: 60 psf corresponds to no significant Maine population centre. Under ASCE 7-16, which the Maine Uniform Building and Energy Code adopts by directing designers to the ASCE Hazard Tool, Portland is 50 psf, Bangor and Augusta are 70 psf, Lewiston is 80 psf, and Caribou and Presque Isle are 100 psf. The western mountains and the upper St. John valley, including Greenville and Fort Kent, fall in ASCE case-study areas where no mapped value applies; the state guidance sets a floor of 100 psf for those conversions. This scalar spans a two to one range and must not be used in place of a site lookup, especially north or west of Bangor. No other value on this row was changed. Maine sets frost depth locally and no state authority establishes a single figure, so the stored 48 inches is unverified and is likely too shallow for northern Maine. Wind speed 105 mph is the ASCE 7-16 interior base contour; Maine site values run about 101 to 112 mph, highest on the southern coast. The winter design temperature is ASHRAE data, is not published by any Maine authority, and is unverified. The termite designation was not verified; northern Maine is likely in the IRC none-to-slight band rather than the slight-to-moderate band the stored value encodes. Prior audit record retained: nec_edition corrected 2020 to 2023 per Maine Electricians Examining Board Chapter 120 (02-318 CMR ch.120), which adopts NFPA 70 (2023 edition) for installations commencing on or after 2024-07-01 and governs Portland; source https://www.maine.gov/pfr/professionallicensing/sites/maine.gov.pfr.professionallicensing/files/inline-files/Electrician-Examining-Board-Chapter-120.pdf