Polyurethane Injection
Polyurethane Injection is a method used to stop water leaks in buildings and structures by injecting special waterproofing foam into cracks and gaps. It's like filling a cavity in a tooth, but for buildings. When the liquid polyurethane is injected, it expands into foam that fills and seals spaces where water might get in. This technique is commonly used in basements, foundations, and other concrete structures to prevent water damage. Companies often look for professionals who can perform this specialized service as it's a key solution for fixing water problems without having to do major construction work.
Examples in Resumes
Successfully completed over 50 Polyurethane Injection projects in commercial basements
Led team of technicians performing Polyurethane Injection and PU Injection repairs
Managed complex Polyurethane Injection waterproofing projects for parking structures
Typical job title: "Waterproofing Technicians"
Also try searching for:
Where to Find Waterproofing Technicians
Professional Associations
Online Resources
Example Interview Questions
Senior Level Questions
Q: How do you determine the best injection pattern for a complex foundation leak?
Expected Answer: A senior technician should explain how they assess water flow patterns, crack patterns, and structural conditions to plan injection points. They should mention the importance of proper spacing and depth of injection ports.
Q: How do you handle a project where the initial injection attempt wasn't successful?
Expected Answer: Should discuss troubleshooting methods, alternative injection patterns, and when to consider different types of materials or techniques. Should emphasize the importance of identifying the root cause of the failure.
Mid Level Questions
Q: What safety procedures do you follow when performing polyurethane injection?
Expected Answer: Should mention proper PPE (protective equipment), ventilation requirements, checking for electrical lines or other utilities, and following material safety data sheets.
Q: How do you prepare a crack for injection?
Expected Answer: Should explain cleaning procedures, surface preparation, port installation, and sealing the crack surface. Should mention the importance of proper spacing of injection ports.
Junior Level Questions
Q: What's the difference between polyurethane foam and polyurethane resin injection?
Expected Answer: Should be able to explain that foam expands more and is used for stopping active leaks, while resin is used for structural repair and has less expansion.
Q: What basic equipment is needed for polyurethane injection?
Expected Answer: Should list items like injection pump, ports, packers, cleaning supplies, and safety equipment. Should understand basic setup and cleaning procedures.
Experience Level Indicators
Junior (0-2 years)
- Basic injection techniques
- Equipment maintenance
- Safety procedures
- Surface preparation
Mid (2-5 years)
- Advanced injection techniques
- Problem diagnosis
- Material selection
- Project planning
Senior (5+ years)
- Complex project management
- Team supervision
- Quality control
- Training and mentoring
Red Flags to Watch For
- No certification or formal training in waterproofing
- Lack of knowledge about safety procedures
- No experience with different types of injection materials
- Unable to explain basic troubleshooting methods
