Repairs of basement walls are best done with a caulking gun and an epoxy-based resin. To cure most cracks, particularly those in mortar between concrete blocks, you can place the tip of the epoxy tube into the crack and pull the trigger to apply the sealant. We have many customers who have tried to fix their cracks themselves or have hired a cheap contractor to do so, and the crack just leaked again months or years later, taking more money out of their wallets and causing even more damage. However, for us, it is a very quick and easy problem to solve.
Some waterproofers will recommend digging the entire outside of the wall where the crack appeared and installing a waterproof barrier. Fortunately, many foundation cracks aren't serious enough to deserve professional attention, and repairing a foundation crack can be a do-it-yourself task as long as the crack doesn't threaten structural integrity. Various masonry repair products, such as hydraulic cement, do a proper job of filling cracks in concrete walls. Liquid Concrete Repair Tubes (LCR), a viscous epoxy that comes in a putty-type cartridge and seven plastic injection ports that deliver the CSF deep into the crack.
The crack can be up to ½ inch wide and is not yet a problem other than letting moisture, odors and gases in. The best way to ensure that a crack doesn't indicate a major problem is to have it checked by a foundation contractor or structural engineer, but some general rules can help you decide whether or not you should be concerned. In addition, cover the entire flange of each injection port with crack sealant, leaving only the extended part of the neck visible. Typically, these types of cracks do not threaten the structural integrity of the house, but they do create an entry point for groundwater, insects and radon gas.
This becomes a problem when the soil surrounding the basement begins to push against the walls, moving them inward and causing bowing and cracking. Repairing a foundation crack larger than ½ inch can be a do-it-yourself task, but in the event that the crack is due to something more serious, you should first seek a professional opinion. If you only had the cracks of the steps, you could go ahead with the basement finishing work, because that kind of crack is a normal sign of settlement. However, the horizontal crack that has bent the wall inwards is the sign of a very weakened wall that may fail.
Easy, economical and easy to do yourself, the main purpose of this concrete repair is to prevent water from seeping into the basement. These problems also take the form of horizontal or staggered cracks along the foundation wall, diagonal cracks in the corners, inward protrusions and sloping walls at the top or bottom. One of the best methods to seal a leaking wall crack in north carolina is to seal it with a high viscosity polyurethane polymer.