Combined Footing Design Example

While a compounded, combined footing is designed to minimize the foot movement during walking or standing on uneven ground and is a popular choice for a foot-maintenance plan, the expense associated with building a new football system can be too much for some homeowners. Here is an example of how the footing and football can be integrated with a composite slab floor and wood-beam floor.

The concept is quite simple: Simply locate a football between the composite floor and the metal framing. For this example, I chose to use a rubberized grout between the two and then place a football in between the composite and the floor to serve as a drainage point. Depending on the surface and the desired end result, the spacing between the composite and the floor could be as little as a quarter of an inch.

To start the project, I purchased an area of concrete for the floor of the addition and then lifted the concrete up about three inches on each side. Once this was complete, I laid a second layer of topsoil over the entire area. After this layer was poured, I placed a second layer of gravel over the first and then a layer of slurry under the topsoil. This final layer serves as a layer of topsoil, to act as a drainage area, and is sprayed with an epoxy compound to protect the gravel.

Once the two layers of dirt were laid, I removed the existing concrete from the walls of the addition and then did a trim job. The addition walls were cleaned and the floor leveled to conform to the roof line. Next, I started laying the concrete on the floor by first spreading a thin, steady layer on the bottom of the concrete floor. For this example, I chose to do the concrete to be finished on a level surface, but may have preferred a cut edge layer on a low grade.

After the concrete was completely down, I carefully filled in all areas where it overlapped with concrete. In other words, I built the concrete around the football that was already there. By using a heavy dose of mortar to keep the footing firmly in place, I then slid the footwall into place over the entire area and proceeded to fill in any gaps with more mortar.

After all the mortar was installed, I moved the football out from under the bottom layer of gravel so that it was ready for flashing. Once this was done, I repeated the same process for the second layer of gravel, leveling both layers in order to give them a straight edge.

When it was time to install the flashing, I went to a local store that had concrete floors and grabbed a couple of long strips of galvanized copper mesh to cover the football while the flashing was still wet. Once the flash had dried for about 24 hours, I simply pulled out the tape and the flashing was installed.

Again, for this example, I am using both new materials and items that I had lying around the house. However, the materials mentioned here should be able to be adapted to fit the following examples.


Combined Footing Design | with Reinforcement Details (with 3d

 


Structural Design of Combined Footings: Solved Example to Eurocode


Combined Footing Design | with Reinforcement Details (with 3d

 


Builder’s Engineer: DESIGN OF COMBINED FOOTINGS BY RIGID METHOD


Builder’s Engineer: SHALLOW FOUNDATION Combined Footings

Leave a Comment