Yes, outdoor benches can and often should be bolted directly to a concrete base for maximum stability and safety. This permanent installation prevents tipping, theft, and annoying wobbles. However, you cannot use ordinary screws. The correct method involves using specialized concrete anchors.
First, position the bench on the concrete slab. Mark the locations of the bench's leg mounting holes onto the concrete using a pencil or marker. Move the bench aside. Using a hammer drill fitted with a masonry bit matching the size specified for your concrete anchors, drill holes at the marked spots. Be sure to drill to the depth required by the anchors.
Clear all concrete dust from the holes using a brush, vacuum, or compressed air—this is crucial for a strong hold. Insert the concrete anchors into the clean holes. Popular choices include wedge anchors, sleeve anchors, or chemical anchors for heavy loads. Place the bench back in position, aligning the legs with the anchors.
Finally, insert the provided bolts or threaded rods through the bench's mounting brackets and into the anchors. Tighten them securely with a wrench, following the anchor manufacturer's torque specifications to avoid overtightening. Your bench is now firmly and safely anchored for years of durable use.