If you have a north-facing balcony that receives limited direct sunlight, moisture and shade can create a breeding ground for slimy algae or mildew on outdoor furniture. To avoid this, choose materials that are inherently water-resistant, non-porous, and easy to clean.
The first recommended material is synthetic rattan (typically made from polyethylene resin wicker). Unlike natural rattan, it does not absorb moisture, and its woven structure allows for quick drying and air circulation, preventing slime buildup. Second, powder-coated aluminum is an excellent choice—the coating creates a sealed, smooth surface that resists oxidation and algae growth, and it remains cool to the touch even in urban heat. Third, high-density polyethylene (HDPE) plastic, often used in teak-look planks or modern chairs, is hydrophobic, UV-stable (though UV isn't a concern here), and can be hosed down easily to remove any dirt or damp residue.
Other solid options include stainless steel (marine-grade 316) and treated eucalyptus wood, but they require occasional cleaning to prevent patina or mildew in shade. For comfort, pair these with quick-dry, all-weather fabric cushions (e.g., solution-dyed acrylic or polyester with breathable mesh backing) that resist mold. Avoid natural teak (unless oiled frequently), raw iron, or fabric with closed-cell foam, as these trap moisture.
To maintain a clean, slime-free balcony, wipe down surfaces weekly with a mild vinegar-water solution and ensure furniture has feet or stands that allow airflow underneath. With those materials, your north-facing balcony can stay fresh, functional, and stylish year-round.