AnswersDriveIn Canada and the United States, steel I-beams are commonly specified using the depth (in inches) and weight of the beam (in pounds per foot). For example, a “4 x 13” I-beam is approximately 4 inches in depth (the measurement taken from the outer face of the first flange, to the outer face of the opposite flange).
Also know, how much does a 20 foot I beam weight?
So, a "W18x40" beam is 18" high, and weigh 40 lbs / foot. So, if a W18x40 beam is 10' long that gives it a weight of 400lbs. Note: steel is insanely strong: typical structural steel is "A36" or "36ksi" which means it can withstand up to 36,000 pounds per square inch before it fails.
How much do I beams cost?
The main determiner of price when it comes to a steel I-beams is not its design or length, however, but rather the height and weight per linear foot of the beam, expressed numerically. Therefore, an 8x17 I-beam is 8 inches high and weighs 17 pounds per linear foot. It will cost less than a 10x35 I-beam.