
1/8
Everything I Did to Flood-Proof My Old House | Reviews by Wirecutter
The author recounts her personal experience with flash flooding during Hurricane Ida in New York City in September 2021, detailing how her old house in Queens was severely damaged. Despite having stored items off the ground, the basement was inundated with 10 inches of water due to sewer and stormwater backup, highlighting the city's aging and overwhelmed infrastructure. This event, which caused widespread damage and fatalities, underscored the increasing threat of heavy downpours due to climate change, with the Northeast experiencing a 71% rise in heavy precipitation over 54 years.
Following this devastating experience, the author, alongside her husband, embarked on a comprehensive journey to flood-proof their home. This article details the various DIY and professional solutions they implemented, emphasizing both prevention and protection. The initial steps focused on exterior modifications. She installed flexible downspout extensions to divert water at least 5 to 10 feet away from the foundation, and flattened the soil in their backyard to correct dips that collected water. Rain barrels were also integrated to collect rainwater for garden reuse, which helps reduce the load on the city’s sewer system. The author highlights the importance of regular gutter cleaning, especially in wooded areas, to prevent clogs and overflow.
Addressing the foundation, the author used hydraulic cement to seal cracks and holes where the foundation met the garden's perimeter. This quick-drying cement is effective for small leaks, though severe issues require professional intervention. After the cement dried, Drylok Extreme Basement & Masonry Waterproofer was applied to the basement floors and walls to combat modest hydraulic pressure. For aesthetic purposes and additional protection, a topcoat of water-based Behr Premium Porch & Patio Floor Paint was used, followed by Kilz oil-based primer and an oil-based white topcoat to address mineral stains and brighten the space.
For immediate water intrusion, the author implemented several solutions. She replaced a flimsy door sweep with an under-door threshold and added weatherstripping to their basement door to create a tighter, more waterproof seal. A critical upgrade was the adoption of a Green Expert 1/3HP Submersible Sump Pump, chosen for its low suction level (1/25 inch) and high pumping capacity (up to 33 gallons per minute), which automatically activates upon contact with water. The article also discusses water-activated Quick Dam Flood Bags and traditional sandbags as temporary barriers, advising on their appropriate use and disposal.
Considering more extensive measures, the author details the installation of a backflow valve to prevent sewage and stormwater from backing up into the basement. This device, installed with minimal excavation, seals off drains when water flows in the wrong direction. While it means appliances cannot be used during major storms, it offers significant protection. They also replaced old cleanout plugs with extra-tight expansion plugs for better sealing. The article culminates with the decision to install a French drain to manage hydrostatic pressure and prevent water accumulation, a significant investment that proved worthwhile compared to the losses incurred during Hurricane Ida. The author also mentions other upgrades like raising basement wall outlets, placing the furnace on cinder blocks, installing cellar doors, getting sewer lines snaked regularly, and purchasing backup insurance and smart water-leak detectors. Additionally, the benefits of a dehumidifier and creating a rain garden with absorbent plants are discussed, emphasizing self-sustaining solutions for managing rainwater. The author concludes by advocating for community action and governmental support for improved infrastructure to combat climate change-induced flooding.
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