DIVISION A · PART 1 — COMPLIANCE AND GENERALUpdated for the 2024 Ontario Building Code
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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
This provision includes a table — formatting is preserved from the source; refer to the official code for the authoritative layout.
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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.