Homeowners can now have a sigh of relief. Poured in concrete foundation cracks can be fixed permanently* without the need for expensive & time consuming exterior excavation. Low pressure polyurethane or epoxy foam injection is a practical and inexpensive solution for many typical shrinkage cracks..
With a 1% callback rate & 99% success rate of fixing the crack problems injection has been an accepted method of filling cracks. Almost all foundation repair contractors are switching to injection technique because it is-Cost effective-Reliable-Permanent* (polyurethane-epoxy foam injection procedure)
Block Wall Foundations
Construction block foundations have mortar around every block making hundreds of joints which can lead to leaking. Construction blocks are hollow which means they can fill with water. For these reasons, if you have a finished basement, or planning to build a finished basement, we recommend you always repair it. There are only two repairs available to fix this problem. You can do an exterior repair or an interior, both repairs are good but we usually recommend a French drain that is installed from the inside.
The French drain is a much less expensive repair then outside system. You are guaranteed to solve two problems simultaneously. This system will deal with water coming through the wall and up from under the floor. With the more expensive exterior repair, you are often only successful in waterproofing the wall but not able to improve the drainage. Reason for this is because the weeping tiles around the rest of the house might be plugged, damaged or nonexistent and you would still not be able to control the water from under the floor. With the French drain we are actually creating a new drainage system inside and under the floor. This will control the water coming through the wall. We never have had a problem with this repair.
What we do is chip up the floor along the leaking wall. We dig a trench and install a modern 4 inch perforated weeping tile and cover it with gravel. Holes are drilled in the bottom course of block to allow the water to drain out. A waterproof membrane is installed over the trench and up the wall as water diversion system. The weeping tile is routed into a sump pump. If there is not an existing sump pump we will supply, install and plumb one for you. We warranty this for life (excluding the sump pump-its warranty is usually 1-3 yrs).
Hydraulic pressure* is a common problem, that is a result of a collapsed or plugged weeping tile or no weeping tile or sump pump installed at all. This will prevent water from being taken away from under the house. To repair this problem of a wet basement - a new weeping tile or o-pipe-perforated is installed either inside or outside often in conjunction with a sump pump-sometimes called a french drain. Our most common weeping tile installation is an interior repair called a French drain.
The floor is broken up along the leaking walls and a trench is excavated. A Four inch perforated weeping tile is placed in the trench and covered with clean gravel to help with drainage. All excavated materials are removed from the site.
A Delta or Platon waterproof membrane is installed to cover the wall and travels under the floor connecting with the weeping tile. The drainage system is routed to a sump pump which carries the water away from the house. New concrete is poured to repair the floor. The same results can be achieved from outside but the cost is considerably higher and not usually our first recommendation.
*Hydraulic pressure is water pressure forcing water up through the basement floor due to outside drainage water pressure coming down the outsides of your foundation wall-this downward pressure of draining surface water from e.g. spring rain falls or winter thaws -this forces water up through the floor-the opposing pressures try equal out.
If we have to repair from the outside or exterior-this type of repair requires excavating along the outside of the leaking wall or structure exposing the wall from the top down to the footing. After the wall has been cleaned and repaired, a waterproof membrane is installed to cover the entire wall. This system will prevent water from being in contact with the wall, and will solve the problem permanently.
*Cracks in poured concrete walls that are larger than 1/4", cracks which are increasing in size, or cracks which are otherwise indicative of foundation movement should be evaluated by a professional.Before repairing a foundation crack it is important to diagnose the cause of the crack and its effects on the building structure. The significance of any foundation crack depends on the crack's cause, size, shape, pattern, location, foundation materials, extent of cracking, impact of the crack on the building, and possibly other factors as well. If there is an underlying ongoing problem causing foundation movement or damage, that problem needs to be corrected too.
With a 1% callback rate & 99% success rate of fixing the crack problems injection has been an accepted method of filling cracks. Almost all foundation repair contractors are switching to injection technique because it is-Cost effective-Reliable-Permanent*
stage 1 Seal the surface-Use a 2 part epoxy adhesive to seal over the surface ports and exposed cracks. The paste cures in about 20 to 45 minutes to provide a surface seal with excellent bond characteristics that holds up under injection pressures. The entire exposed crack is covered with the paste, leaving only the port holes uncovered.
|stage 2 Inject the crack: Begin injecting at the lowest port on the wall and continue until the epoxy or urethane begins to ooze out of the port above it. That’s the visual sign that the crack has been filled to that level. Plug the first port with the cap provided and move up to the next port, repeating this procedure until the entire crack has been filled with epoxy or urethane. Let the compression fall on the dispensing tool push the material into the crack using slow, constant pressure. This will reduce the possibility of leaks or “blow-outs” and allow time for the repair material to fully penetrate the crack.|
| stage 3 Remove the ports: Allow 24 to 48 hours at room temperature for the epoxy or polyurethane to cure and penetrate into the cracks. The injection ports can then be removed by striking them with a trowel or hammer. If appearance is an issue, the epoxy surface seal can be chipped away or ground off with a sanding disk. Another option is to use a surface seal that can simply be peeled off the wall after the repair is fully cured.
|DISCLAIMER: This information is for educational purposes only. Do not attempt to fix foundation cracks yourself. Leave it to the professionals. Repairs methods & materials may vary.*|