Smooth it out on the outside.
How to fix erosion under concrete.
Shrub and tree roots excel in preventing erosion way better than grass roots.
These simple methods can help you revitalize your soil repair damaged areas and prevent soil erosion in the future.
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.
Drill at least four holes through the slab at a point that s centered on the void beneath.
Use an ax handle or whatever and pack it up in there.
This is a means of filling voids underneath concrete slabs by injecting pumping filler materials into the defective areas.
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.
Mix the concrete to a thicker consistency.
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.
Once it hardens use some soil around the low spots and slope it away from the steps packing it down firmly.
Connect a hose to a slabjacking pump then run the hose to the holes leading to the void.
Use a drill equipped with a masonry bit to bore.
Properly installed gutters and downspouts will effectively channel rainwater away from building foundations thereby minimizing erosion under concrete slab foundations.
Then back fill a little bit with soil.
I would suggest packing dirt rock under as well as you can.
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.
Manure compost newspaper grass clippings and other organic materials can be good for this purpose.
Without the right support concrete will crack sink and cease to be the sturdy solid surface you can count on.
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.
To repair you ll need a form.
It s imperative to fix erosion under concrete as soon as possible but first you need to know what to look for.
So the concrete is buried by a few inches.
If your sidewalk hasn t heaved by now then the addition of new concrete below it isn t going to change anything.
Use a hoe or fabricate a pushing stick and stuff the concrete into the crevice.
Recommendations for installing downspouts state that they should channel water 5 to 10 feet from the base of the building.
How to fill voids under a concrete slab.
