So, building codes naturally have a few things to say about foundation footings.
Like any code recommendations, these are not how-to guides to building footings.
Review these parameters and adjust them according to your local code requirements.
The Spruce / Michela Buttignol
This must continue for at least ten feet.
Load-Bearing Value of Soil
Foundations must rest on firm, undisturbed soil.
Undisturbed soil is significantly stronger than soil that has been disturbed.
Some sort of expansion material will be placed between the caissons to allow for soil expansion and contraction.
The foundation walls will then be poured on top of them.
Width of Footings
Footing width can vary according to the structure, site, and conditions.
Two-story buildings require a minimum of 15-inch wide footings for soil with a 1,500 LBV.
For soil with 2,000 LBV or greater, two-story buildings may have 12-inch wide footings.
Bottom of the Footings
The preference for the bottom of the footing is that it is level.
Spread Footings
Spread footings help distribute the load carried by the footings over a wider area.
The spread footing should be at least six inches thick and project at least two inches on both sides.
Use this summary only as a general sense of code requirements for foundation footings.
The IBC encompasses the International Residential Code (IRC) but includes provisions for commercial and residential buildings.
The IRC is equally suitable for residential buildings.
In the IRC, the chapter relating to foundations and footings is chapter 4.
Keep in mind that each construction project is unique.
Building codes vary by state and municipality, mainly diverging regarding foundation footings.
Drainage conditions and local seismic vulnerability will also affect these building codes.
If your foundation fails inspection, immediately contact a structural engineer for an assessment.
you might fix many foundations, bringing them back to code.
Second, review your warranty and insurance policies for assistance in paying for repairs or your next steps.
Not all constructions need footings.
In those cases, those homes will not have a basement.
