This video is a detailed DIY tutorial on repairing a vertical concrete foundation crack using a two-part epoxy injection kit. The process begins with extensive surface preparation, including chipping away a previous failed mortar patch and, contrary to the kit's instructions, grinding a V-groove along the hairline crack to ensure better epoxy penetration. The repair involves applying a two-part epoxy paste to seal the crack's surface and mount a series of injection ports along its length. A critical lesson is learned during the injection phase when the liquid epoxy begins leaking through a pinhole in the surface seal, a flaw the host had noticed earlier. The problem is resolved on the fly using a piece of high-adhesion sealant tape to patch the leak, allowing the injection to be completed successfully. The host concludes by highlighting the significant cost savings of the DIY approach and emphasizes that the most crucial step for success is ensuring a completely airtight surface seal before injecting the epoxy filler.
DIY Foundation Crack Repair: A Step-by-Step Guide with Lessons Learned
0:33The DIY Approach: The video outlines a foundation crack repair, emphasizing the significant cost savings of a DIY kit (around $100) compared to a professional service (quoted at $2,000).
1:17Preparation is Key: The first major step is cleaning the crack, which involves chipping away old, failed mortar and using various tools to remove all loose debris to ensure the new epoxy has a solid surface to bond to.
1:43Creating a V-Groove: Despite the kit instructions stating it's not mandatory, the host uses an angle grinder to carve a V-groove along the crack. This is done to widen the opening and ensure the liquid epoxy can fully penetrate the wall.
11:41The Repair Kit: The kit consists of a two-part epoxy paste for sealing the surface, plastic injection ports, and a two-part liquid epoxy for filling the crack from the inside out.
12:06Applying the Surface Seal: After mixing, the epoxy paste is used to mount the injection ports every 12-18 inches. The host then carefully covers the entire length of the crack with the paste, creating an airtight seal which must cure for 24 hours.
20:14A Critical Mistake Discovered: Before injecting the liquid epoxy, the host blows air into a port and discovers a small pinhole leak in the cured surface seal, foreshadowing a problem.
23:27Injection Failure and On-the-Fly Solution: As soon as the liquid epoxy is injected into the lowest port, it begins leaking from the faulty seal. The problem is quickly fixed by applying a piece of high-adhesion sealant tape (Siga Fentrim) over the pinhole.
26:20Key Takeaway: The most crucial lesson from the experience is that the epoxy surface seal must be perfectly airtight before injection. Any leaks will cause the filler to escape instead of filling the crack.
26:39Final Result and Monitoring: After successfully injecting the entire crack from the bottom up, the repair is complete. The host plans to leave the wall exposed through a rainy season to confirm the fix is successful before finishing the basement.
Summary of YouTube Comments:
The comments section is highly engaged, with viewers sharing a wealth of alternative repair methods, technical advice, and personal experiences.
Alternative Techniques: Many users describe different foundation repair techniques, including using hydraulic cement, different epoxy brands with dual-cartridge caulk guns, and professional methods like drilling angled holes to inject expanding foams like Sikaflex.
Exterior Repair is Key: A dominant theme is the importance of addressing the problem from the exterior. Commenters repeatedly advise excavating the foundation, cleaning the crack, and applying an external waterproofing membrane as the primary and most effective long-term solution.
Technical Advice & Observations: Viewers offer practical tips such as using a needle scaler for preparation, using mesh tape to reinforce the surface seal, and confirming that the rust staining is likely from corroding rebar within the concrete, which highlights the importance of stopping water intrusion.
Positive Feedback and Humor: The community appreciates the host's transparency in showing the mistake and the on-the-fly fix. There is also lighthearted humor regarding the frequent use of the word "crack" and a confirmation that "palette" is the correct term for an artist's paint board.