DIVISION A · PART 1 — COMPLIANCE AND GENERALUpdated for the 2024 Ontario Building Code

1.4.2.1.Symbols and Other Abbreviations

(1) In this Code, a symbol or abbreviation listed in Column 1 of Table 1.4.2.1. has the meaning listed opposite it in Column 2. Table 1.4.2.1. Symbols and Abbreviations Forming Part of Sentence 1.4.2.1.(1) Symbol or Abbreviation Meaning 1 in 2 slope of 1 vertical to 2 horizontal ASWG American Steel Wire Gage ABS acrylonitrile-butadiene-styrene Bq becquerel(s) CBOD5 the five day carbonaceous biochemical oxygen demand cd candela(s) CFU colony forming units cm centimetre(s) cm² square centimetre(s) CO2e carbon dioxide equivalent CPVC chlorinated poly (vinyl chloride) dB(A) A-weighted sound level ° degree(s) °C degree(s) Celsius diam diameter DWV drain, waste and vent EIFS Exterior Insulation and Finish Systems ft foot (feet) g gram(s) ga gauge gal imperial gallon(s) gal/min imperial gallon(s) per minute h hour(s) HDD heating degree-day(s) Table 1.4.2.1. (Cont’d) Symbols and Abbreviations Forming Part of Sentence 1.4.2.1.(1) Symbol or Abbreviation Meaning HVAC heating, ventilating and air-conditioning Hz hertz in. inch(es) J joule(s) K degree(s) Kelvin kg kilogram(s) kg/m² kilograms per square metre kN kilonewton(s) kPa kilopascal(s) kV kilovolt(s) kW kilowatt(s) L litre(s) L/min litre(s) per minute L/s litre(s) per second LPF litres per flush lx lux m metre(s) M metric nomenclature for reinforcing bars m² square metre(s) m3 cubic metre(s) m/s metre(s) per second max. maximum mg/L milligram(s) per litre min minute(s) min. minimum MJ megajoule(s) mm millimetre(s) MPa megapascal(s) N newton n/a not applicable ng nanogram(s) No. number(s) nom. nominal Table 1.4.2.1. (Cont’d) Symbols and Abbreviations Forming Part of Sentence 1.4.2.1.(1) Symbol or Abbreviation Meaning o.c. on centre OSB oriented strandboard Pa pascal(s) PB polybutylene PE polyethylene PE/AL/PE polyethylene/aluminum/polyethylene PEX crosslinked polyethylene PEX/AL/PEX crosslinked polyethylene/aluminum/crosslinked polyethylene PVC poly (vinyl chloride) R thermal resistance value (imperial unit) RSI thermal resistance, International System of Units s second(s) temp. temperature T&G tongue and groove V volt(s) W watt(s) wt weight % percent µg microgram(s) µm micron U-value overall thermal transmittance

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Code text is reproduced for reference from the Ontario Building Code (O. Reg. 163/24, 2024 Building Code Compendium). This page is provided for general information and is not an official copy. Always verify requirements against the official Ontario Building Code and confirm with your local building department.