A typical urban planter box, when filled, can add a significant and often surprising amount of weight to your balcony. The total weight is the sum of the planter itself, the soil, and the water it holds. A common medium-sized resin or wood planter (about 24" L x 12" W x 12" H) weighs 5-15 lbs (2-7 kg) empty. The soil is the heaviest component: moist potting mix weighs roughly 12-18 lbs per cubic foot. A planter of this size holds about 1.5 cubic feet of soil, adding 18-27 lbs (8-12 kg). When watered, the soil can absorb substantial moisture, potentially adding another 5-10 lbs (2-4.5 kg). Therefore, a single modest-sized filled planter can easily weigh 30-50 lbs (14-23 kg). For larger boxes, the weight multiplies quickly. This is critical for balcony safety. Always check your balcony's load capacity (typically 40-60 lbs per square foot for residential spaces) and distribute weight evenly, placing heavier planters near load-bearing walls. Consult a structural engineer if unsure, as exceeding the limit risks serious damage.
How much weight can a typical filled urban planter box add to a balcony?
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