Yes, outdoor benches can be bolted directly to concrete slabs, and this is actually the recommended method for creating permanent, secure, and safe installations in public spaces, parks, and residential settings. The process requires specific tools and concrete anchors designed to handle weight and environmental factors.
To begin, you'll need to identify the bench's mounting points and mark corresponding spots on the concrete using a pencil or marker. The most critical components are concrete anchors - specifically wedge anchors, sleeve anchors, or concrete screws - which expand within the concrete to create a powerful hold. These anchors are superior to standard screws because they're engineered to resist pulling out under the substantial leverage forces that benches experience when people sit and shift weight.
The installation process involves drilling precise holes into the concrete using a hammer drill with a carbide-tipped masonry bit that matches your anchor diameter. After drilling, thoroughly clean out all concrete dust from the holes using a brush, compressed air, or vacuum to ensure proper anchor engagement. Insert your chosen anchors through the bench's mounting holes into the concrete, then tighten the nuts with a wrench until snug. Be careful not to overtighten, as this can damage both the anchor and concrete.
Consider environmental factors like drainage to prevent water pooling, and use corrosion-resistant hardware (stainless steel or galvanized) for longevity. For heavy-use areas or benches that might be subject to vandalism, consider adding a security element like epoxy adhesive to the anchor threads. With proper installation, your bench will remain securely fastened for years, capable of withstanding daily use and weather conditions while providing safe, reliable seating.