Updated: Aug 25
This our new project in progress at North Riverside, IL
What Can Affect the Foundations?
Where the foundations are affected by tree roots (or their previous removal), you may be required to employ a fairly deep trench filled with concrete but with a compressible material to one or both sides of the external trenches to counteract any heave or expansion in the ground.
Water plumbing must enter the building at a depth of at least 750mm but no more than 1.35m below ground. If that means that they pass through a concrete foundation then they must either be laid prior to pouring or, better still, a duct installed for them to be pushed through later.
If sewage pipes leaving the building have to be profound than the top of the foundation concrete then they should also be ducted; they cannot be trapped within the concrete and must be able to move freely.
Electricity and gas don’t usually need to be ducted or installed at this point as they are normally surface mounted. Finally, the building and warranty inspectors will have to approve the excavated foundations prior to any concrete being poured.