The HVAC Portion of getting this wall down was a large part of the project, but there was still a lot more planning that needed to go into it. It became obvious to us pretty quickly when getting quotes for the structural work that choosing a contractor was going to be hard. The quotes were all over the place, with the main difference being the size of the beam. We received quotes for everything from a 11 3/4″ x 5 1/4″ beam to a 18″ x 7″ beam to span our 21′ distance. So how do we know if a beam is big enough to support the weight or if one is overkill? How were the contractors coming up with the beam size? How can we choose a contractor when we don’t have a standard beam size?
To get the beam size, the contractors were going to suppliers and providing measurements and answering questions. The supplier would then tell them the size of the beam necessary. The main things that are important to calculate the load on the beam are the:
- length of the beam
- height and length of the floor joists the beam will support
- number of floors above the beam
- the type of attic (truss or stick framing)
- many other factors