Proxer Construction specializes in epoxy crack sealing on foundations, retaining walls and concrete slabs.
Foundation cracks can be caused by many factors – poor construction materials, poor workmanship, shifting earth, earth settling, concrete curing/shrinkage, etc. As a result, concrete cracks contribute to water infiltration.
There are two most effective methods when it comes to crack sealing:
- Polyurethane injections
- Epoxy injections
Polyurethane injection foams are used on actively leaking cracks.
Special injection ports are attached to the surface of cracked concrete walls and a sealer is applied over crack surface to keep resin within the crack.
Liquid polyurethane resin gets injected into the crack. Urethane resins react with moisture and expand by volume inside the wall (up to 20x). Expanding capabilities of urethane resins help to seal “hard to get” cracks.
Once repair is completed urethane resins form flexible seal that stay in place during contraction and end expansion of foundation walls through freeze and thaw cycles.
Epoxy injections are used to “weld” cracked substrates together. The seal created by injection epoxy is usually stronger that the surrounding concrete itself.
Filling the cracks or voids with these types of high strength epoxies eliminates the movements occurring during freeze/thaw cycles.
Low viscosity epoxy resins are usually best for hairline cracks (thinner than 1/32”).