Without the right support concrete will crack sink and cease to be the sturdy solid surface you can count on.
How to fix erosion under concrete.
Bury an aluminum flashing or redwood or other suitable material a couple of inches deep and about an inch from the concrete edge allowing it to extend above the bottom edge of the concrete approximately an inch.
Mulching makes use of organic materials to do just this while adding nutrients back into the soil.
Drill at least four holes through the slab at a point that s centered on the void beneath.
Concrete doesn t expand in the cold you re probably thinking of frost heave which is where moisture in the soil freezes and expands disturbing whatever s above it.
Properly installed gutters and downspouts will effectively channel rainwater away from building foundations thereby minimizing erosion under concrete slab foundations.
It looks like the problem is just that it was poured on top of the ground instead of being dug out a few inches and then being back filled after.
Smooth it out on the outside.
Use an ax handle or whatever and pack it up in there.
I would suggest packing dirt rock under as well as you can.
These simple methods can help you revitalize your soil repair damaged areas and prevent soil erosion in the future.
Manure compost newspaper grass clippings and other organic materials can be good for this purpose.
There are several conventional and alternative void filling materials which can be employed to achieve a similar effect.
Erosion under concrete is serious whether it s your foundation driveway patio or sidewalk that s affected.
This is a means of filling voids underneath concrete slabs by injecting pumping filler materials into the defective areas.
It s imperative to fix erosion under concrete as soon as possible but first you need to know what to look for.
How to fill voids under a concrete slab.
Fill the hole with concrete.
Concrete is a very heavy material in addition to being unable to generate any upward pressure on the slab the added burden on the soil often speeds settling.
So the concrete is buried by a few inches.
Mix the concrete to a thicker consistency.
Use a hoe or fabricate a pushing stick and stuff the concrete into the crevice.
To repair you ll need a form.
Then back fill a little bit with soil.
If your sidewalk hasn t heaved by now then the addition of new concrete below it isn t going to change anything.
Connect a hose to a slabjacking pump then run the hose to the holes leading to the void.
Once it hardens use some soil around the low spots and slope it away from the steps packing it down firmly.
1 855 752 2522 uses an expanding polymer foam injected under the concrete that fills voids and if necessary raises you re settled concrete back to the proper grade.
