Using Expanding Foam To Raise Concrete

Smaller sections of sunken concrete can be cut out using a wet saw and then lifted out with a crowbar.

Using expanding foam to raise concrete.

It seems though that the hole for a 10x10cm post should only be 15cm any bigger and you would need more than one bag. Use 5 8 inch masonry bit to drill a hole through the concrete and spray the foam into it. Foam jacking is a concrete slab repair method that uses a high density polyurethane foam to raise the slab. Sand also has air in it but it may be a better option for the do it yourselfer trying to raise concrete.

So how do you raise a concrete slab with foam. Sika postfix is a two component pre proportioned polyurethane resin. This process is much the same as mud jacking an older method that uses a concrete slurry mixture to obtain the same results. Suitable for all types of posts including wood steel and pvc.

The stuff is designed to intentionally move whatever s adjacent to the gap it s being sprayed into. The foam will fill up the parts of the concrete that are uneven and will raise it to the proper height. It is mixed in the bag to produce expanding foam for supporting and backfilling fence mail box gate and signage posts. 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.

The following video shows how dramatically effective this is. The foam will expand and harden filling the void in the ground and leveling the driveway. A good solution for diyers. After the geolift has done its magical work the last thing left to do is patching up the holes.

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. Shore up concrete problems. Concrete lifters and levelers know that you raise a slab of concrete one side at a time. Spray foam really is a magical tool for household insulation.

Moving in the other direction is an expanding foam called polylevel. 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. Locate the dips get the right equipment and foam. The average 4 inch thick concrete slab only weighs 1 3 of a pound per square inch.

Lightweight pouch replaces two 50 lb. If it is done correctly. I m about to do a 60ft run of fencing and had thought about using the foam. Specifically heavy concrete slabs that have settled over time and are in need of raising.