After getting lots of great info on strengthining joist enough to support tile in my kitchen I have come to the conclusion that along with sistering joist (which in my case will do very little, do to fact with wires & utilities I would be lucky to fit in a 2x6 or less in most places on my 100 plus year old 2x8's.) So my question is could i build a 12' beam out of 2x4x12' to support an area with 10ft joist span? i dont have a high cieling and we use this area for washer & dryer so i am looking for something low profile that i wont wack my head on. would a 3" steel I beam be a better choice? if 2x4's are an option how many would it take?