Okay, you have a balcony, and it’s leaking. You’ve figured out where the leak is. The obvious next step is to get it sealed. If you choose to do it yourself, rather than hire a professional, then you’ll need to know how to seal it properly.


To help you out, we’re here to lay out the basic procedure. We’ll cover the essential steps, making sure you get the leak sealed tight.


First, we’ll go over the essentials to this project. You’ll want a reinforcing membrane. A block brush and roller would come in handy. Silicone sealant and a waterproofing system are important. Finally, you’ll want a primer on hand.


Make sure that the substrate is clean, dry, and not falling apart. Prime the rough areas with floor primer. Use a slurry coat on the smooth or dense surfaces. The block brush is what you use to paint over them. You’ll want to let the paint dry completely before your next move.


Apply the silicone to all internal corners and interfaces. Be sure to allow for movement as you work and do not flatten the beads out. Leave it to cure for 24 hours.


Apply a coat of acrylic-based waterproofing over the central area. Bed the membrane after with a wet acrylic-based waterproofing system. Make sure there are no wrinkles or air bubbles, and that everything is adhering to the substrate. Use the roller to press things into place.


Saturate the work area by applying a thick coat of waterproofing over the membrane. Do this only after the first coat dries.


Allow all the waterproofing to dry completely. This process will take three days or more, depending on the environment. This is why you don’t fix leaking balconies when you’re expecting a lot of rain; it’ll take weeks to dry in the worst case.


Rain dilutes uncured acrylic waterproofing, so don’t do this while it’s raining. You’ll need to protect the whole thing for three days after application, no matter how long it takes to dry.

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