I need to replace the sub-floor in my kitchen. This would require me to cut out a beam under an adjacent wall. How can I tell if the beam is load bearing? I'm not sure how much weight it would support even if it is load bearing because it's only one 2x4 and it's quite rotted. I just want to know if I can remove it without some part of my house falling down. Here's a picture:Image - TinyPic - Free Image Hosting, Photo Sharing & Video Hosting Thanks in advance!