
Regarding water infiltration in utility vaults, precast joints often serve as weak links. Conventional methods like cementitious grouting offer temporary solutions but often fail to withstand structural movements or shifting over time, resulting in a reoccurrence of leaks.
Repairing Precast Joint Leaks with Spetec PUR GT350
Utility vaults are constructed from precast concrete sections that are joined together. The connections between these concrete sections are called precast joints. Over time, precast joints may develop small gaps caused by things like soil movement or temperature changes. These gaps allow water to leak into the utility vault.
An effective solution is using a combination of Spetec PUR GT350 and Spetec Oakum. Spetec PUR GT350 is a flexible polyurethane grout that can accommodate movements between sections of precast concrete. Spetec Oakum is an oil-free dry jute rope that, when used in conjunction with the grout, helps seal large and irregular-shaped defects.
Installation Steps
- Clean the surfaces where you plan to apply the Oakum. Moistening the surfaces can enhance the reaction with the resin.
- Cut the Oakum into appropriate lengths.
- Saturate the Oakum with Spetec PUR GT380 resin in a clean container, allowing time for the resin to soak in.
- Using gloves, pull a section of the saturated Oakum through a loose set to remove excess resin.
- Dip the Oakum in a pail of water to initiate the resin's expansion.
- Tightly pack the Oakum into the leaking precast joint using an appropriate tool, such as a screwdriver or wooden dowel.
- If needed, inject additional resin directly through the Oakum via a grout needle or by drilling holes into the concrete behind it.
- Allow the material to cure overnight before trimming any excess foam.
Repairing Pipe Penetration Leaks with Spetec PUR F400
Pipes for utility lines pass through openings in the walls of utility vaults. These openings are called pipe penetrations. Concrete and/or sealant around the pipe penetrations can break down over time. The vault walls may also shift a little bit. Both of these issues can lead to gaps around the pipe penetrations, allowing water to leak into the vault.
Qualified contractors can use Spetec PUR F400 combined with Spetec Oakum to achieve long-lasting results.
Installation Steps
- Soak Spetec Oakum in Spetec PUR F400 polyurethane grout, and then quickly submerge it in water.
- Immediately pack the soaked Oakum around the pipe sitting in the sleeve, allowing it to harden into a tightly sealed gasket.
- If further sealing is required, use an injection needle to fill the area behind the Oakum with more chemical grout.
The longevity of this approach is remarkable, offering durability that could last up to 50 years.
Key Takeaways
- Polyurethane grouts like Spetec PUR GT350 and Spetec PUR F400 offer superior performance and durability for sealing leaks in utility vaults.
- When used in conjunction with Oakum, these grouts provide effective solutions for addressing leaks at precast joints and pipe penetrations.
- Following the appropriate installation or repair steps ensures that the leak-sealing measures will be long-lasting, potentially offering up to 50 years of durability.




Utility vaults are critical components of modern infrastructure, providing secure containment for electrical, telecommunications, or other equipment. They are designed to be robust and durable. However, one common but often overlooked issue is the occurrence of leaks, most commonly found in precast joints and pipe penetrations.
Uneven concrete slabs raise risks for retail establishments during crowded holiday shopping seasons. Unlevel concrete can easily cause tripping accidents, injuries, lawsuits, and disruptions. To mitigate these issues, retail owners need to address slab problems proactively before the holiday rush. Durable polyurethane concrete leveling is an optimal solution for lifting, stabilizing, and filling voids in sunken concrete.

Collaborating with skilled contractors is key to developing effective slab repair plans and ensuring customer safety. The partnership involves assessing slab and soil conditions to identify appropriate solutions like lifting, stabilization, or void-filling. Timing repairs to minimize business disruptions also requires collaboration.
The holiday season is almost upon us, and as a retail establishment owner or manager, you're likely gearing up for the rush of customers that this festive time brings. Amidst the excitement and anticipation, it's crucial not to overlook a key aspect of ensuring a successful and safe holiday season: addressing sunken and unlevel slabs on your property.
Concrete Leveling with Polyurethane
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If you own or manage a below-grade parking garage, contact Alchatek for more information about protecting your property from water damage. Our team can provide insights and recommendations tailored to your facility's unique waterproofing needs.
Below-grade parking garages are susceptible to moisture due to their subterranean nature. This moisture can pose significant risks to the electrical systems within these structures. Water leakage around electrical conduits can lead to short circuits, electrical fires, and even electrocution hazards. These risks not only endanger lives but can also result in substantial legal liabilities for garage managers.
Environmental corrosion poses a significant threat to the longevity and safety of below-grade parking garages. Elements like salt, chemicals from car exhaust, and even groundwater can have a corrosive effect on the concrete and metal components of these structures. Over time, this corrosion can weaken the garage's structural integrity, leading to costly repairs and safety risks.