This is a question many homeowners ask contractors before embarking on repair of wall cracks. It is right to be concerned about your health and the possible effects of chemical compounds introduced to your home.

There are various compounds used for fixing wall cracks. The type of compound used will depend on the method of repair being used.

  1. Crack injection

Crack injection is the most popular method for repairing cracks from the interior. The injection of the cracks helps to prevent water from seeping into the basement. The process involves injecting either epoxy paste or an expanding urethane compound into the crack.

Epoxy is a polymer resin. When it is combined with a hardener, it dries quickly and becomes a hard plastic that is water resistant. It gives off a smell but is completely non-toxic. This smell dies away when the epoxy has cured.

Urethane is also non-toxic. It is a common compound in various plastic products including food packaging and water bottles. It is chemically inert. You can be sure that the product will remain the same for its lifetime in your wall.

  1. Wall clay process

This is the second method of repairing wall cracks in foundations. It is used to repair cracks from the exterior of the foundation wall. It involves the use of bentonite clay. The clay is applied to the cracks and allowed to cure. When the clay is exposed to water it expands. This results in the formation of a tight seal.

Sodium bentonite is the primary ingredient in the clay used for foundation repair. It is a naturally occurring material that is extracted from the earth. It is completely harmless.

Be sure to check with your contractor to find out if the compounds they are planning to use on the foundation are harmful.