When constructing a concrete patio adjacent to your house, it’s important to create a proper interface between the concrete and the house to prevent water infiltration, protect the foundation, and maintain the structural integrity of your home. Here are the key elements to consider when creating the connection between a concrete patio and your house:
Expansion Joint: Install an expansion joint between the house and the concrete patio. An expansion joint is a gap that allows for the expansion and contraction of the concrete due to temperature changes. This joint should be filled with a flexible sealant or backer rod to prevent water from infiltrating the gap. This helps prevent potential damage to your house’s foundation caused by water intrusion and freezing.
Flashing: Install a metal or vinyl flashing where the patio meets the house to create a waterproof barrier. The flashing should extend from the foundation of the house and over the edge of the concrete patio. This prevents water from seeping behind the patio and potentially damaging the foundation or causing structural issues.
Proper Sloping: Ensure that the patio surface is sloped away from the house to promote water drainage and prevent water from pooling near the foundation. A slight slope away from the house is critical for proper water runoff.
Sealant: Apply a high-quality concrete sealant to the edge of the concrete patio where it meets the house. This helps create a waterproof seal and protects against moisture intrusion. The sealant should be designed for outdoor use and should be periodically maintained and reapplied.
Grading and Drainage: Properly grade the area around the patio to direct water away from the house. Consider the use of a French drain or other drainage solutions to ensure water flows away from the foundation.
Backfilling: When backfilling against the foundation, use clean fill material that promotes proper drainage. Avoid using soil with high clay content, as it can retain water and increase the risk of water infiltrating the foundation.
Consult a Professional: It’s advisable to consult with a professional, such as a concrete contractor or a structural engineer, to ensure that the connection between the concrete patio and the house is done correctly and is in compliance with local building codes and best practices.