If it is done correctly.
Using expanding foam to raise concrete.
Spray foam really is a magical tool for household insulation.
The foam will fill up the parts of the concrete that are uneven and will raise it to the proper height.
They also know that when you raise one side you may lower another side.
The foam will expand and harden filling the void in the ground and leveling the driveway.
This process is much the same as mud jacking an older method that uses a concrete slurry mixture to obtain the same results.
Use 5 8 inch masonry bit to drill a hole through the concrete and spray the foam into it.
Moving in the other direction is an expanding foam called polylevel.
I m about to do a 60ft run of fencing and had thought about using the foam.
After the geolift has done its magical work the last thing left to do is patching up the holes.
Specifically heavy concrete slabs that have settled over time and are in need of raising.
The following video shows how dramatically effective this is.
It seems though that the hole for a 10x10cm post should only be 15cm any bigger and you would need more than one bag.
Lightweight pouch replaces two 50 lb.
Also if using concrete never put concrete on the bottom of the hole it will form a pocket round the post from which the water can t drain.
Bags of post mix.
Smaller sections of sunken concrete can be cut out using a wet saw and then lifted out with a crowbar.
So how do you raise a concrete slab with foam.
Sand also has air in it but it may be a better option for the do it yourselfer trying to raise concrete.
The reality is that you can use exactly the density foam that you need to lift the lid off the box and did not start out with too dense of a material for the job.
The stuff is designed to intentionally move whatever s adjacent to the gap it s being sprayed into.
Suitable for all types of posts including wood steel and pvc.
A good solution for diyers.
Although fiberglass has been commonly used for insulation spray foam can actually outperform it plus with so many ways you can use spray foam this material certainly is handy now only if it could help us out with all of those concrete problems.
Patch up the holes with concrete and your new driveway or sidewalk or walkway will look good as new.
It is mixed in the bag to produce expanding foam for supporting and backfilling fence mail box gate and signage posts.
The average 4 inch thick concrete slab only weighs 1 3 of a pound per square inch.
Shore up concrete problems.
Concrete lifters and levelers know that you raise a slab of concrete one side at a time.
