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This section of the walkway was sloping back towards the building and holding water that would often freeze in the winter.
Two vertical injection ports are seen in this photo. These high pressure ports operate one way in that the material is injected under the concrete slap and cannot escape back out of the ports. Along the building the concrete is raised and what looks like a bead of caulk is actually the trimmed PolyLEVEL™ injection foam that also seams out the water at that joint.
Once the concrete was raised the injection holes are re-sealed. (A little larger than the size of a dime)
After each piece of the walkway is lifted, the seams are sealed to keep out water.
The sealant is a durable flexible material that will block water and not deteriorate in the sun light.
The walk way along the building was sloping back hold water along the building. The main concern was in the colder months the water would freeze and cause a fall. Also the walkway seams were re-sealled after leveling.