Some of the bridges span 100, or more, feet between the poured concrete supports at each end of the bridge. You can see this clearly if you pay attention to bridges that cross many of the interstate highways you might travel here in the USA. Generally speaking the taller the vertical web, the farther the beam can span between supports. The top flange is the flat part that ironworkers walk on as they erect the steel. It's important to realize steel I-beams gain a great amount of strength from the top and bottom flanges. Steel I beams derive much of their strength by the thickness and height of the vertical web section of the I beam. Note how the tall poured walls look just like the center web of an I-beam. You begin to see this if you look at the vertical web in a steel I beam or even a simple wooden floor joist. Many people fail to realize that a typical foundation wall is, among other things, a beam. I was not thinking through how to connect the new foundation to the existing one. My geology professors would have frowned at me had they been at the job site. I couldn't figure out how the shallow crawlspace foundation would stay connected to the full basement foundation since they were at different elevations. Paul M., Orono, MNĭEAR PAUL: I can remember many years ago having these same thoughts when I was building my first room addition. Will this connection become a hinge point in the future causing cracks in the walls? I am very concerned about how to make a connection between the structures that will stand the test of time. What's the best way to do this? Is there a way to waterproof the connection? CLICK HERE to Get Tim's FREE & FUNNY Newsletter!ĭEAR TIM: I'm building an addition on my home and realize I must connect the new foundation with the existing one.Consult with a structural/soil engineer.Footing/foundation connected with steel pins.I've successfully installed steel pins that are epoxied into the old foundation." Connect New Foundation to Existing Checklist "You have numerous options with respect to making a physical connection between the two foundations. The clay soil beneath it is extremely stable. This footing will soon have a foundation wall on it directly over the keyway groove in the concrete. You start the foundation with a footer or footing. Connect new foundation to existing: Those two pieces of vertical rebar help lock two different pours of concrete together.
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