What size I-beam do I need
A private steel Isize beam is very popular in most homes. Most are 8 inches tall, but 10 or 12-inch-high beams enable you to spread more substantial distances with some pesky strings. To determine the specified depth of a beam, divide the span (in inches) by 20. For illustration, a 25' span would be 25x12 / 20 = 15”. The girth of this beam would be within 1/3 and ½ the depth. The dimensions of a beam would be identical, but the collar would be thicker.