If your balcony gets full, direct sunlight, you're right to question if your chosen wood furniture will warp. The short answer is: it depends heavily on the wood type and construction. Direct, prolonged UV radiation and heat from the sun draw out moisture unevenly, causing wood to crack, bend, and warp.
Dense, oily hardwoods like Teak, Ipe, and Shorea are champions in full sun. Their natural oils act as a barrier against moisture loss and UV damage. Cedar and Redwood are softer but contain natural tannins that offer good resistance. For a budget option, high-quality Acacia can perform well if properly maintained. Avoid porous, soft woods like pine or fir for full-sun applications unless they are of a specifically treated, outdoor-grade variety.
Protection is key. Apply a UV-inhibiting outdoor oil or sealant formulated for your wood type *at least* annually. During extreme heatwaves, consider a protective cover. Remember that all wood will experience some natural weathering and silvering in the sun—this is often part of its rustic charm.
Choose furniture with sturdy joinery (like mortise-and-tenon or stainless steel screws) rather than just glue or weak fasteners, as warping stress can break weak joints. By selecting a sun-resistant species and committing to simple, regular maintenance, you can enjoy beautiful, stable wood furniture on your sunny urban balcony for years to come.