Ethan Clarke
Plastic septic tanks are lightweight, low-cost, and easy to install. However, they are more prone to damage than concrete septic tanks. A crack in a plastic septic tank can have severe consequences, including sewage leaks, groundwater contamination, foul odours, and structural damage. Therefore, it is essential to address the issue promptly. Depending on the severity and location of the crack, repair options may vary. In some cases, minor cracks can be patched using specialized sealants or epoxy compounds. Before attempting any repairs, it is crucial to ensure that the tank is empty and that the inside and outside surfaces are clean. This may require professional assistance, especially when dealing with large septic tanks containing hazardous materials.
| Characteristics | Values |
|---|---|
| When to patch a plastic septic tank | When a crack develops |
| What to do before patching | Empty the tank, clean the surface, drill holes to relieve pressure, sand a groove |
| Patching process | Apply plastic tank repair epoxy, use a polyethylene welding rod, let it dry |
| Risks of not patching | Sewage leaks, groundwater contamination, foul odours, structural damage |
| Alternative options | Pump the tank, rent a tank, contact a professional |
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What You'll Learn
Empty the tank
Emptying a septic tank is a crucial step in repairing any cracks or leaks that may have developed. While small water-collection tanks are relatively easy to empty, larger septic tanks may require professional assistance. It is important to check local regulations before attempting to empty a large tank, as it may be illegal to do so without a license due to the presence of hazardous materials.
The first step in emptying a septic tank is to assess the extent of the damage. A visual inspection of the tank will help identify any cracks, fractures, damp spots, or signs of sinking or an uneven surface. Once the damage has been identified, it is crucial to contact a licensed septic system professional to safely empty the tank. Attempting to do this yourself can be dangerous and may result in the release of deadly gases. Only a licensed contractor should pump out a septic tank.
After the tank has been safely emptied, the inside and outside of the tank must be cleaned. This includes removing any hazardous materials, such as septic waste or fuel, with the help of a professional. The area around the crack should be free from dirt or extraneous material. This step ensures that the tank is ready for repair and helps prevent the crack from growing larger.
In some cases, it may be necessary to drill small holes at the top and bottom of the crack to relieve structural pressure. This can be done with a rotary tool from a plastic tank repair kit. Sanding a groove parallel to the crack can also help prepare the surface for repair. Once the tank is empty and clean, it is important to follow the specific repair instructions provided by the manufacturer, which may include using a welding rod or applying an epoxy compound to seal the crack.
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Clean the surface
Before you begin to repair a cracked plastic septic tank, it is important to clean the surface of the tank. Firstly, identify the crack and assess the extent of the damage. You can do this by visually inspecting the tank for any signs of cracks, fractures, gaps, damp spots, or an uneven surface.
Once you have located the crack, you must completely empty the tank before attempting to clean and repair it. If you have a small water-collection tank, this can be done independently. However, for large septic tanks, you may need to contact a licensed septic tank contractor to pump out the tank. Do not attempt to do this yourself, as it is illegal and can cause deadly gases to escape.
After the tank is empty, clean the outside area around the crack with a rag or another cleaning tool. Ensure that the area is free from any dirt or extraneous material. You may also need to sand the area around the crack to create a smooth surface for the patch to adhere to. This can be done with a small piece of sandpaper or an abrasive rotary tool. Be sure to remove any dust and wipe the surface clean.
It is important to note that you should also clean the inside of the tank to remove any hazardous materials, such as septic waste or fuel. This step should be done by a professional to ensure the safe removal of these materials.
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Drill holes to relieve pressure
Drilling holes to relieve pressure is an important step in repairing a cracked plastic septic tank. While plastic septic tanks are generally durable, cracks can occasionally form, requiring immediate attention to prevent them from growing and becoming unrepairable.
Before drilling any holes, it is crucial to completely empty the septic tank. Depending on the size of the tank, this may require professional assistance. Once the tank is empty, clean the surface around the crack to remove any dirt or debris.
The next step is to drill two small holes, one at the top and one at the bottom of the crack. These holes serve the critical function of relieving structural pressure and preventing the crack from expanding further. Without these holes, the crack could continue to grow, potentially rendering the tank beyond repair.
It is worth noting that drilling holes in certain parts of a septic tank system, such as the riser, can have unintended consequences. According to some sources, drilling holes in the riser can release gases, causing odours and potentially exposing individuals to hazardous gases like hydrogen sulfide. Therefore, it is essential to consult a professional or refer to the manufacturer's instructions before drilling any holes in a septic tank.
After drilling the holes, you can proceed with the rest of the repair process, which typically involves using a plastic welding rod to seal the crack. However, it is always recommended to consult a professional plumber or septic tank expert, especially when dealing with larger septic tanks or those containing hazardous materials.
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Apply epoxy
Before applying epoxy to your plastic septic tank, there are a few important steps to follow. Firstly, ensure that your tank is completely empty. If you have a small water-collection tank, this is a straightforward process. However, for larger septic tanks, you may need to enlist professional help, as attempting to empty the tank yourself can be dangerous and illegal.
Next, clean the surface of the tank where the crack is located. It is important that any hazardous materials are removed by a professional. Once the inside is empty, use a rag or cleaning tool to clean the outside area, ensuring that the area around the crack is free from dirt or debris.
Now you are ready to apply the epoxy. Firstly, sand the area around the crack to create a smooth surface for the epoxy to adhere to. You can do this using sandpaper or a rotary tool, creating a groove about half an inch wide and parallel to the crack. This will allow your epoxy to fit in and seal the crack effectively.
When applying the epoxy, always follow the manufacturer's instructions. Most epoxy products will need to be mixed thoroughly before application, and they may begin to harden within a few minutes, so work quickly. Use a brush to apply a layer of epoxy to the damaged area, then place a fiberglass reinforcing patch on top, and cover with another layer of epoxy.
After applying the epoxy, you will need to let it dry for a specified amount of time. Once dry, your tank should be ready to use again, but always check the manufacturer's instructions for guidance on how long to wait before refilling and using your tank.
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Sand the area
Before you begin to sand the area, you must ensure that the plastic septic tank is completely empty. If it is a small water-collection tank, you can do this yourself, but for larger tanks, you may need professional assistance. Once the tank is empty, clean the surface where the crack is located. Make sure the area around the crack is free from any dirt or debris.
Next, you need to sand the area. Use an abrasive rotary tool to sand a groove that is 1/2 inch parallel to the crack, above and beside it. Sanding the area will create a rough surface to which the repair epoxy can adhere. Be sure to sand about 1 inch around the crack to ensure the patch is secure. After sanding, remove any dust and wipe the area clean.
It is important to note that you should not attempt to pump a septic tank yourself, as this is illegal and can cause dangerous gases to escape. Always consult a professional if you are unsure about any aspect of the repair process.
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Frequently asked questions
Unusual or unpleasant odours coming from your septic tank could indicate that there is a crack in the tank. You should also look out for damp spots, or a sinking or uneven surface around the tank area.
You should contact a licensed septic system professional immediately. They will be able to evaluate the severity of the damage and recommend the best course of action.
You will need to completely empty your tank and clean the surface where the crack is located. You should also drill two small holes, one at the top and one at the bottom of the crack, to relieve structural pressure and prevent the crack from growing.
You can use a plastic welding gun and a polyethylene welding rod to fill in the crack. You should always follow the manufacturer's instructions when using a welding gun. Alternatively, you can use a tank repair kit, which usually includes epoxy, a brush, sandpaper, mastic, and a piece of fibreglass.
In some areas, it may be illegal to repair your plastic septic tank yourself, especially if it is a large tank containing hazardous materials. You should always check your local regulations before attempting any repairs.
