Garage floors show the least visible sign that there is a void under them.
Is there a void under basement floor.
As the floor slab heaves slightly usually after repeated heavy rains or due to the spring thaw it can crack and will rarely recede all the way back to its original position.
Sometimes floor number 1 may be the lowest basement level.
Slabjacking is used to prevent everything from porch floors to patios and basement floors from shifting.
In that case the ground floor may be numbered 2 or higher.
The void that you are feeling is normally caused by repeated heaving and deterioration of the basement floor slab over many years and some erosion of the sub slab soil.
When you drive over a void you will hear the shallowness of the space under the floor.
You can usually tell there is a void under your garage floor by hearing it or feeling it.
Installing a tile floor in all or part of your basement lets you have some fun with design while still quickly covering up existing concrete floors.
Small cracks may also be visible in.
In this situation the lower level is called lower ground the main floor is called upper ground and floors above it are numbered serially from 1.
Filling hollows under a concrete floor is done through a process called slabjacking.