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Technical tips for Concrete Crack Injection. Articles, Video Support
FAQ List for Foundation Walls
What does it cost to repair a foundation crack?
This can vary depending on the type of crack repair. If it is structural or if it is leaking. A good common example would be a poured concrete basement wall that has cracked diagonally down from a window to the floor 6 ft long, a non-structural crack. This could be repaired using a standard polyurethane product. A polyurethane kit would cost $140 to $215 depending on the size of kit purchased. You save on the labor cost if you purchase a DIY kit. This same crack repaired by an experienced foundation contractor may range from $400 to $800 depending on your location, the level of expertise and any other costs built into this repair such as overhead, warranty, labor and workers compensation costs etc. There is no average per ft cost by contractors, but the cost could be as much as 5 times the material costs. So, if you take this ratio into account when you are adding up the costs there can be big savings by doing the work yourself or considering this work as an added service if you are a contractor.
Can Crack injections be done in the winter?
Yes, doing crack foundation injections in the winter can be accomplished by allowing the basement wall exposure to the heat of the building by removing any insulation against the wall. It will require 3 or 4 days for the concrete to warm to at least 40 deg f. In the extreme cold outside temperatures, you may need to temporarily insulate the exterior wall.
Epoxy vs Polyurethane foam for injections?
Epoxy can be injected into a structural or non-structural crack. All structural cracks should be injected with an Epoxy. A horizontal crack mid-wall or cracks over 1/4 inch wide are considered structural cracks. If a foundation crack is narrower widths, mostly vertical, and leaking which is very common down from a window then a Polyurethane is a good economical choice that will stop water permanently.
Are all the Epoxies the same?
NextStar Epoxies come in a variety of viscosities (thickness to flow). They can be as thin as water like the #4 ULV Epoxy for super hairline cracks to thick as butter like the 101 Epoxy Paste for wide cracks. The #4 ULV Epoxy is a slow cure of 4 days. The LV (Low Viscosity), MV (Medium Viscosity), EHV (Extra High Viscosity) are all designed to gel from 20 to 40 min to prevent drain out and will set in 24 hrs at 32deg F. The 101-Epoxy Injection Paste is very thick and designed for wide cracks. It stops flowing when injection pressure stops. All the Epoxies will bond to each other during injection if switching viscosities during the same crack repair.
How long does the epoxy take to cure?
NextStar 121 Epoxy's are designed to cure at 32 Deg F, gel anywhere from 20 minutes to 1 hr, and have an initial cure at 24 hrs. Our E101 Epoxy Injection Paste is designed to stop flowing when injection pressure is removed and will cure in 24 hrs. The #4 ULV Epoxy is a very slow curing Epoxy and may gel between 1 hr to 8 hrs. Depending on the concrete temperature, it may take up to a week to fully cure.
How long will the products product life span in storage?
Generally, all our products will be good in storage for one year as long as they do not freeze.
One exception is the Koster 2n1 resin is limited by age and should be used within 6 months.
More Detailed information click here.
How do I do a repair of an active leaking foundation crack?
Crack injection repair on a leaking crack can be challenging since attaching injection ports to a wet wall is not possible. One option is to drill a 5/8th hole, 1 inch deep, hammer in corner ports and seal with Blitz powder or hydraulic cement. Then you can proceed as normal with a low-pressure crack injection using either an Epoxy or Polyurethane. Option 2 uses standard high-pressure crack injection with polyurethane. Insert injection packers and use a modified grease gun or high-pressure pump to do a high-pressure injection.
What are the steps for crack injection?
1. Wire brush the concrete surface 2. Dry the wall if wet . 3. Attach injection ports. 4. Use epoxy seal paste to seal the crack between and around ports. 5. Inject Epoxy or Polyurethane. 6. After cure remove ports if necessary. For High Pressure 1. Drill locations for injection packers. 2. Clean out drill holes and install packers. 3. Inject polyurethane using a pump or modified grease gun. 4. Leave packers in place for 1 week and then remove zerk tips if they are in the way.
How is Carbon Fiber used with concrete repair?
Carbon Fiber used as part of a structural repair has many advantages over the old method of using steel to reinforce concrete. It is many times stronger than steel compared to its weight and it will not rust or corrode. Carbon fiber can be formed or cut in unlimited ways. It has very high tensile strength and very low elasticity making it ideal for concrete reinforcement repair. It is commonly formed as a strap or as a grid when used for foundation repair to reinforce a bowed basement wall so the wall does not re-crack. Carbon Fiber can also be formed as a staple or stitch for either a floor crack or a wall crack. Carbon fiber has no compression strength so epoxy crack injection must be used to prevent crushing the fiber.
What is a Snap tie and how they are repaired?
Snap ties are metal tabs installed in the concrete forms when concrete is poured to hold the forms together. Snapped off to release the forms most of the metal tab is left inside the concrete. Over time they can rust and allow water to enter the foundation. Using hydraulic cement, tar or polyurethane to repair is not recommended because they may fail eventually. The best solution is to use an ultra-low viscosity epoxy to encapsulate the rusting snap tie and provide a permanent solution. The typical repair product solution is #4 ULV Epoxy with an autoinjector.
What makes NextStar products different?
NextStar offers a much wider selection of products to repair many different foundation problems encountered versus a one solution fits all. NextStar products are all professional-grade. All epoxy and polyurethane products have a limited life span and NextStar’s supply is constantly being replenished so products are never very old when it is sold. The age of the products of many of the competitors is often lengthy and questionable. NextStar does more than sell products, we also have full-time professional technicians servicing our local area on a regular basis. We can provide expert advice on any concrete foundation problem solution. A service that most competitors are unable to provide.
How is repairing cinder block walls different from repairing poured concrete walls?
A crack in a poured concrete wall can be easily injected in order to waterproof and it is an approved repair method. An injection is not an effective repair of a cinder block wall because it is hollow, the product will only leak into the hollow spaces and not provide waterproofing. The best long-term solution is to excavate the exterior and install a membrane for waterproofing. If the wall is bowed it may require carbon fiber reinforcement on the interior. Some contractors may propose to use a waterproofing drain system on the interior, but if you are in a climate with frost then water may get trapped inside the hollow spaces and cause more damage to the blocks over time.
What is Weeping Tile ( Drain Tile) ?
Weeping tile is a perforated pipe that surrounds the basement just below the footing level on the exterior that drains into a sump pump pit to be pumped out or into the sewer or septic tank of some older buildings. This allows groundwater that surrounds the building to drain off.
I Lost my Instructions ?
No proplem you can contact NextStar at 866-445-3984 press 1 for sales and we will gladly email out a copy of the instuctions for your kit or product.
General Information Links
Tech Tip List for Concrete Repair
How to use a feed hose
Video about Crack injection Tools & Hardware
Video Kit-1 Polyurethane w/ Auto-injectors
Video Kit-3 ULV Epoxy w/ Autoinjectors
Video how to install Carbon Fiber Stitches
Video how to use 10 Minute Mender for Concrete Floors
Video Fast E555 repair for Floor Cracks
Foundation and Concrete crack repair