The best way to anchor a bench to concrete without drilling is to combine heavy-duty outdoor construction adhesive with strategically placed ballast weights. From our factory’s experience, this approach offers both immediate strength and long-term flexibility while leaving the concrete completely intact. First, clean the concrete surface thoroughly and let it dry. Apply a high-strength, weatherproof adhesive—such as polyurethane-based construction adhesive—in a serpentine pattern along the bench’s base plates. Then press the bench firmly into place and allow the adhesive to cure for at least 24 hours. For extra security on windy sites or high-traffic public areas, add internal ballast: fill hollow steel or plastic bench legs with sand or gravel, or attach pre-cast concrete weights to the lower frame using stainless steel bolts (no drilling into the floor needed). This method not only prevents tipping and theft but also lets you relocate the bench later without leaving unsightly holes. Alternatively, for temporary or frequently moved seating, use thick rubber mats with a high-friction surface as a base layer, combined with heavy sandbags draped over the lower supports. Remember that while adhesive works brilliantly on smooth or slightly textured concrete, it is less effective on oily, painted, or heavily sealed floors—so always test a small area first. Our factory’s preferred no-drill solution is the adhesive-plus-ballast combo because it achieves a stability rating comparable to bolted installations, yet requires only simple tools and no permanent alteration to your property. For the best results, choose an adhesive rated for outdoor use and temperature extremes, and ensure the bench itself has flat, continuous contact with the floor. With this method, you get a rock-solid bench that stands up to daily use, weather, and even vandals, all without a single drill hole.