Conway receives around 50 inches of rain per year - more than most of the country - and the flat coastal plain terrain means that water has limited places to drain. The soils here are a mix of sandy and clay-heavy layers, and clay soils expand when wet then shrink as they dry. That repeated swelling puts stress on concrete slabs and foundation walls, and it keeps ground moisture close to the surface beneath crawl spaces for days after a heavy storm. Homes built close to the Waccamaw River corridor see this most acutely, but the drainage issue affects properties throughout the city. A large share of Conway's housing stock - built during the 1970s and 1980s - predates the vapor barrier and crawl space sealing practices that contractors use today.
Conway also sits about 15 miles inland from the Atlantic coast, which puts it squarely in the path of tropical storms and hurricanes that move up the South Carolina coastline. Hurricane Florence in 2018 caused serious flooding in Conway, and the moisture intrusion from that event damaged insulation in hundreds of homes. Even typical summer storms can overwhelm drainage in low-lying neighborhoods and push water into crawl spaces that were not properly sealed. An insulation contractor who understands Conway's flood history and the specific moisture challenges of Horry County's coastal plain knows to address water control before putting new material in place - not after.