Fixing Water Ponding On Your Concrete Patio

Water ponding on concrete patios is a common issue that can lead to several problems, including concrete degradation, failure of the waterproofing system, and leaks. This issue is usually caused by clogged drains or inadequate drainage and can often be fixed by re-pitching the concrete surface and installing a waterproofing system. Other solutions include drilling holes in the concrete, laying gravel or decking over the concrete, or installing a drainage channel.

Install a drain

If you have ponding water on your concrete patio, it is important to fix it as soon as possible to avoid further damage to the structure. One way to address this issue is by installing a drain. Here is a step-by-step guide on how to do it:

Step 1: Assess the Situation

Before installing a drain, it is crucial to identify the cause of the ponding water. Check for clogged drains due to debris such as leaves or trash, improperly set scuppers or drains, and incorrect sloping of the concrete surface. Ensure that you have proper drainage and that clogs are not causing the ponding water issue.

Step 2: Choose the Right Drainage Solution

There are different types of drains available, such as French drains, trench drains, or strip drains. Consult with a professional to determine the most suitable type of drain for your patio. Consider factors such as the amount of water that needs to be drained, the slope of the patio, and the surrounding landscape.

Step 3: Plan the Drain Location

Identify the lowest point of the patio, as this is where the drain will be most effective. Mark the area where you plan to install the drain. If you have a large patio, you may need to install multiple drains to ensure proper drainage.

Step 4: Gather the Necessary Tools and Materials

Installing a drain will require specialized tools and materials, such as a concrete saw, drain pipes, gravel or pebbles, drain grates, and sealants. You may also need a blower, primer, and waterproofing membrane, depending on the specific requirements of your project.

Step 5: Cut the Concrete

Using a concrete saw, cut a trench from the lowest point of the patio to the edge where the water can drain away. The trench should be wide enough to accommodate the drain pipes and gravel. Make sure to wear appropriate protective gear during this process.

Step 6: Install the Drain Pipe

Place the drain pipe in the trench, ensuring it is level and has a slight slope to facilitate water flow. Secure the pipe in place with gravel or pebbles, following the manufacturer's instructions. Ensure that the pipe extends beyond the edge of the patio to direct water away from the foundation.

Step 7: Install the Drain Grate

Choose a drain grate that fits securely over the trench and can bear the weight of people or objects on the patio. Secure the grate in place following the manufacturer's instructions, ensuring it is level with the surrounding concrete surface.

Step 8: Finalize the Installation

Clean the area, removing any debris and allowing the surface to dry. Apply a flexible urethane sealant to the edges of the grate and the surrounding concrete to prevent water seepage. Allow the sealant to cure completely before using the patio.

By following these steps, you can effectively install a drain to address the issue of ponding water on your concrete patio. Remember to consult with professionals and carefully plan the installation to ensure a successful and long-lasting solution.

Cut and slope the concrete

If you have standing water on your concrete patio, it is a sign of inadequate drainage and improper sloping of the deck material. This can lead to the deterioration of the concrete surface and/or waterproofing membrane. To fix this, you can cut and slope the concrete to direct water away from your house and prevent ponding.

First, you need to determine if your patio is completely flat and has low spots where water collects. If so, you will need to cut and slope the concrete to create a slight angle so that water will run off the surface, much like a roof gutter that is sloped to direct water to the downspout. The key is to make the slope gradual, ensuring adequate drainage without affecting the usability of the patio. A good rule is to use a minimum slope of 2%, which is equivalent to a 1/4-inch drop for every foot of length. For example, if your patio extends 10 feet from your home, a drop of 2 1/2 inches from the starting point by the house to the opposite end of the slab will give you the desired slope.

To cut and slope the concrete, you can follow these general steps:

• Rent a concrete saw or grinder to cut through the concrete and create a channel for drainage. The width of the channel will depend on the desired size of the drain and the amount of water that needs to be directed away.
• Use a level to mark the height at which the waterproofing membrane should be applied to ensure the correct pitch.
• Install a waterproofing system, following the manufacturer's instructions and the guide marks on the wall.
• Allow the waterproofing system to cure properly before using the patio.

It is important to note that cutting and sloping concrete can be a challenging task, and it may be wise to consult a professional concrete contractor to ensure the work is done correctly and safely. They will have the expertise to calculate the right slope for your project based on the intended use of the slab, your climate, and site conditions. Additionally, if your patio has an existing waterproofing membrane, you may need to remove it down to bare concrete before proceeding with the above steps.

Seal the concrete

Sealing your concrete patio is a great way to prevent water ponding and protect your concrete from deterioration and leaks. Here are the steps you can take to seal your concrete effectively:

Prepare the Concrete Surface

Before applying any sealant, it is essential to ensure that your concrete surface is clean and free of any debris. Use a pressure washer or a stiff brush to remove any dirt, grease, or stains. If there are any cracks or imperfections in the concrete, use a concrete repair mortar to level out the surface. For larger areas or if you plan to apply a waterproofing system, consult a contractor or engineer to determine the correct pitch and direction of the concrete slope.

Choose the Right Sealant

There are various sealants available, including liquid membrane-forming curing compounds and plastic film. Liquid membrane compounds consist of waxes or resins with highly volatile solvents and can be applied by hand or power sprayer. Plastic film is lightweight and comes in various colours, but ensure you choose a thickness that will prevent damage. Black plastic film is ideal for cold weather due to its heat absorption properties, while white plastic reflects sunlight and is better suited for warm climates.

Apply the Sealant

Follow the manufacturer's instructions for applying the sealant. For liquid membrane compounds, ensure the concrete is wet, and apply the compound before it is absorbed into the concrete. For plastic film, place it over the wet concrete surface as soon as possible, ensuring it remains in contact with the surface during the curing period.

Cure the Concrete

Proper curing is crucial to the effectiveness of the sealant. For liquid membrane compounds, allow the compound to cure according to the manufacturer's instructions. For plastic film, you may need to suspend it over the concrete surface on battens until it can be placed directly on the surface without causing damage. Ensure the film remains in contact with the surface to prevent severe drying.

Maintain the Sealed Concrete

Regularly inspect and maintain your sealed concrete patio to prevent water ponding and ensure its longevity. Keep the surface clean and free of debris, and if you notice any cracks or damage, repair them promptly.

By following these steps and maintaining your sealed concrete patio, you can effectively prevent water ponding and protect your concrete investment.

Drill holes in the concrete

Drilling holes in concrete is a straightforward task, but it requires the right tools and safety equipment. Here is a step-by-step guide to drilling holes in your concrete patio to fix water ponding:

Step 1: Gather the Right Tools and Safety Equipment

You will need a hammer drill, which is specifically designed to drill into concrete and other masonry materials. Make sure to use a drill bit that is suitable for concrete, typically made of carbide or diamond. Wear safety goggles and a respirator to protect your eyes and lungs from dust.

Step 2: Mark the Holes

Use a tape measure and a pencil to mark the locations of the holes you intend to drill. It is important to plan the spacing and pattern of the holes carefully to ensure effective drainage.

Step 3: Drill the Holes

Secure the drill bit in the hammer drill and align it with the marked spots. Start drilling with gentle pressure, allowing the drill to slowly penetrate the concrete. Apply a steady, firm pressure as you drill, ensuring that the drill bit stays straight and does not wander. Drill to the recommended depth, which will depend on the size of the bit and the drainage requirements.

Step 4: Clean the Holes

Use a can of compressed air or a small brush to remove any dust and debris from the drilled holes. This step is important to ensure that the holes remain clear and functional for drainage.

Step 5: Install Drainage Pipes (Optional)

Depending on your specific situation, you may want to install drainage pipes or a drainage system connected to the holes. This can help direct the water away from the patio and prevent it from pooling in other areas.

Step 6: Test and Maintain

After drilling the holes, test the area during rainfall or by pouring water onto the patio to ensure that the water drains effectively through the holes. Periodically check the holes to make sure they are clear of debris, and clean them as needed to maintain proper drainage.

Drilling holes in your concrete patio can be an effective way to alleviate water ponding issues. However, it is important to plan the location and number of holes carefully, and you may also want to consider installing a drainage system to direct the water away from the patio and your home.

Resurface the concrete

Resurfacing the concrete is an option to fix water ponding on your concrete patio. This method can help to create a proper slope to address the ponding issue. Here is a step-by-step guide to resurface your concrete:

Step 1: Prepare the Concrete Surface

Before starting the resurfacing process, ensure that the concrete is clean and free of any debris or contaminants. If there is any existing paint, sealers, or coatings on the concrete, they must be removed through mechanical means, such as sandblasting or grinding. This step is crucial to ensure the new concrete bonds properly with the existing surface.

Step 2: Assess the Slope

Determine the correct slope required to achieve proper drainage. A common recommendation is a 2% slope or 1/4 inch per foot. Mark the necessary slope on the vertical wall to guide the application of the new concrete.

Step 3: Mix and Apply the New Concrete

Prepare a batch of fresh concrete following the manufacturer's instructions. Ensure the consistency of the mix is suitable for resurfacing work. Start applying the new concrete to the patio, following the marked guidelines for slope. Use appropriate tools, such as a trowel or float, to spread and level the concrete evenly across the surface.

Step 4: Cure and Finish the Concrete

Allow the new concrete to cure properly. This process typically takes several days, and it is important to follow the manufacturer's instructions for the specific product used. Once the concrete has cured, you can finish it by sealing or painting it to enhance its appearance and protect it from the elements.

Step 5: Maintain and Inspect Regularly

Regular maintenance and inspection of your concrete patio will help extend its lifespan and prevent future issues. Keep the surface clean and free of debris, and address any cracks or damage promptly to avoid further complications.

Resurfacing concrete is a viable option to address water ponding issues on your concrete patio. By following these steps, you can create a proper slope and improve the drainage of your patio, making it more functional and aesthetically pleasing. Remember to wear appropriate safety gear, such as gloves and eye protection, when working with concrete.

Frequently asked questions