The Step-by-Step Waterproofing Process
3. Sealing the Deal
Okay, you’ve got your materials, you’re feeling confident — let’s get to work! Waterproofing PVC conduit isn’t rocket science, but following these steps carefully will ensure a professional-quality result.
Begin by thoroughly cleaning the surfaces you’ll be joining. Any dirt, grease, or debris can compromise the bond. A quick wipe with a clean rag will usually do the trick. Next, apply PVC primer to both the inside of the fitting and the outside of the conduit. Let the primer dry completely, as per the manufacturer’s instructions. This crucial step softens the PVC slightly, allowing for a stronger, more durable bond with the cement.
Now comes the cement. Apply a generous, even layer of PVC cement to both surfaces — again, the inside of the fitting and the outside of the conduit. Don’t be shy; you want full coverage. Immediately insert the conduit into the fitting and give it a slight twist to distribute the cement evenly. Hold the joint firmly for about 30 seconds to allow the cement to set. Excess cement will squeeze out, so be prepared to wipe it away with your rag. You can always add some cement if you think it isn’t enough.
If you’re using threaded fittings, apply Teflon tape to the threads before screwing them together. This creates a tighter, more watertight seal. Tighten the fittings securely with a wrench, but be careful not to overtighten, which could damage the PVC. Finally, inspect the joints for any gaps or cracks. If you find any, apply a bead of silicone sealant to fill them in. Let the sealant cure completely before exposing the conduit to water. Then, you’re all done and good to go. Good Job.