What is a stepped footing?
A step footer or footing is one that’s poured at different levels. When you see a complex one, it appears to look like a set of steps as the footer changes elevation with the ground. That’s why it’s called a step footer.
What is a stepped footing used for?
Stepped Footings allow depth of footings to transition from one elevation to another.
How deep do footings need to be for steps?
Dig a trench about 125mm deep for the footing for the first riser.
When to use stepped footings in a foundation?
Footings shall be stepped where it is necessary to change the elevation of the top surface of the footing or where the surface of the ground slopes more than one unit vertical in 10 units horizontal (10-percent slope). A footing, in the macroscopic sense (pad, long run of wall strip), shall not have it’s bottom surface sloped greater than 10H:1V.
How big should a step be for a sloped footing?
Unless the site slopes drastically, try to keep a minimum horizontal run of 10 ft (3 m) for each step, if possible. Keep the detailing simple. Avoid using Z-shaped bars (Fig. 3). Their geometry may make it necessary to slant the riser out of plane to meet cover requirements for the treads. It’s also prudent to evaluate other footing options.
When is it necessary to change the surface of a footing?
Footings shall be stepped where it is necessary to change the elevation of the top surface of the footing or where the surface of the ground slopes more than one unit vertical in 10 units horizontal (10-percent slope). Step Details my firm has used since’97 and previous by my Father since the early/mid 60’s.
When do you cantilever over a stepped footing?
However, the side forms are extended and cantilevered out over the lower footing forms until the end of the upper footing is at least 12 inches or so past the back of the earth slope. Sometimes the location of the vertical face is calculated so that normal width wall forms will fit from that vertical surface back to the next closest corner.
