How to Fix a Hole in a Slab Vent
Vents in concrete slabs are used to allow air or moisture to pass through the slab. The air transfer from the vent is important for climate control inside basements. A hole is made in the concrete to fit the slab vent in, so holes near the vent can potentially do more damage because a small crack near the vent can quickly turn into a larger hole. Does this Spark an idea?
Instructions
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1
Remove any large pieces of broken concrete from the hole.
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2
Wash the hole with water and then scrub the hole with a wire brush. You do not need to rub the hole until it is completely smooth. You want the edges to be a little rough to help the patch bond to it.
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3
Suck up the water and any remaining debris with a shop vacuum.
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Mix in the directed amount of water to the concrete floor patch. Some concrete floor patches do not require water to be added at all. However, most floor patches are made of cement and require water to be added before use.
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Apply the floor patch to the hole. Avoid getting any of the material inside the vent. You want to completely fill the hole in. It is better to use too much material than too little.
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Smooth the floor patch down using a trowel. Scrape up any extra material using the side of the trowel. The top of the patch should be even with the rest of the concrete slab. It takes about 24 hours for most floor patches to dry completely.
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Tips & Warnings
If a hole forms near the slab vent once, you have a high likelihood of another hole forming near your patch. Try to figure out what damaged the concrete in the first place. If it is a consistent issue, you might want to use a reinforced concrete patch.
A few different types of materials can be used for concrete floor patches. Many of these materials can be found pre-mixed at a hardware store. In most cases, the material being used should not matter at all. Unless you have a special situation that requires a special patch, such as some form of reinforced concrete, you can use any material.
