Although it may seem like a daunting task, repairing a concrete wall is actually fairly simply when you know how. However, if you find that you need a little extra help, you can always contact the experts at http://www.sussexropeaccess.co.uk.
Choosing the right material for the job
A number of different masonry products can be used such as hydraulic cement to repair a concrete wall. However, most products are only effective for a few years. to gain lasting results, it is best to use a type of epoxy, which is relatively cheap and easy to use.
Make sure your wall is clean
Before you start, make sure that the crack is dry. Cracks that are slightly damp can be dried with a hairdryer. After drying, wait for fifteen minutes to make sure that there is no water seeping into the crack. Next, scrub away any loose paint, filler or concrete with a wire brush. A car vacuum cleaner can also be used to remove all debris and dust from the area.
Block the injection ports
Tap 3 inch finishing nails part of the way into the crack, spacing them out at approximately 12 inches. These nails can be used to line up the injection ports with the crack.
Attach the injection ports
Select plastic injection ports and spread the base of one of them with a little sealer, taking care that the hole is free from sealer. Slide the injection port over on top of one of the nails that you have placed into the crack and press it hard to the wall. The remaining injection ports can be installed in the same way.
Apply sealer around the crack
Use a margin trowel or putty knife to apply more epoxy sealer to the entire crack. Make sure that the sealer is spread approximately 1/8 inch thick and with around 1 inch on each side of the crack. Next, cover the flange of all of the injection ports with crack sealer, making sure that only the extended neck part remains visible. Take time to smooth out the sealer and then use a paintbrush that has been dipped in mineral spirits feather the edges of the sealer.
Inject epoxy into the crack
If you have access to the other side of the wall check to see whether or not the crack goes right the way through the wall to the other side. If this is the case, you will also need to seal the other side of the wall, following the steps outlined above. Leave the sealer for at least six hours before you inject the epoxy. Start at the lowest injection port and slowly and evenly dispense your epoxy into the crack.
Seal the injection ports
Remove the sealer gun from the crack and plug up the newly filled port. Insert the tip of the sealer gun into the port and dispense the epoxy. This procedure should be repeated for all of your injection ports.
Cut the injection ports away
Wait five days before using a hacksaw to cut the necks off of all of the injection ports. The severed ports can then be patched with a little crack sealer if you wish.
For more advise of fixing cracks in your concrete wall, check out the following sites: http://www.thisoldhouse.com/toh/how-to/step/0,,20355507,00.html, http://realestate.msn.com/article.aspx?cp-documentid=27691339. If you also need to do other types of repairs such as repairing pipe penetrations you can find more information at http://www.wikihow.com/Repair-a-Poured-Concrete-Wall.