Balcony & Terrace Floor Wastes

For coastal or marine environments (within 1-2km of the shoreline), we strongly recommend 316 stainless steel balcony drains. The 316 grade contains 2-3% molybdenum, which provides superior resistance to salt spray and chloride-induced pitting corrosion. In our experience, 304 stainless steel balcony drains in coastal locations typically develop surface rust spots within 2-3 years, while 316 grade maintains its appearance for 10+ years even in direct ocean exposure. The price difference between 304 and 316 is approximately 15-25%, which is a small investment compared to the cost of replacing corroded drains.

Our balcony and terrace floor wastes come with an integrated leaf and debris catcher basket positioned below the grate. This basket captures leaves, twigs, dirt, and other debris before they enter the plumbing system. Maintenance involves: (1) Lifting the grate (no tools required); (2) Removing the basket; (3) Emptying the debris; (4) Rinsing the basket and replacing it. We recommend cleaning the basket monthly during leaf-fall season (autumn) and quarterly during other seasons. For balconies with overhanging trees, consider installing a leaf guard mesh over the grate to catch debris before it enters the drain.

Yes, our stainless steel balcony drains are frost-resistant. The 304/316 stainless steel construction handles freeze-thaw cycles without cracking, deforming, or losing structural integrity — unlike plastic (PVC/PP) drains that can become brittle and crack in freezing temperatures. However, the water in the standard 50mm water seal can freeze in sub-zero temperatures, which temporarily compromises the odor seal. For balconies in cold climates, we recommend installing our waterless trap insert, which contains no water and therefore cannot freeze. The waterless trap maintains its seal regardless of temperature, making it ideal for unheated balconies and terraces in cold climates.

Building codes in most jurisdictions require a minimum slope of 1:80 (1.25%) to 1:50 (2%) from the building facade toward the drain. This slope ensures water flows away from the building (preventing water ingress through wall-floor junctions) and toward the drain for efficient removal. For large terraces (over 25 sqm), multiple drains with defined drainage zones are recommended, each with its own slope pattern. In tropical climates with heavy rainfall, a steeper slope of 1:50 to 1:40 (2-2.5%) is recommended to handle higher water volumes. Always consult local building codes for specific requirements in your market.

This depends on local building codes. In many jurisdictions, balcony drains can either: (1) Discharge to the exterior (open drainage) if the volume is manageable and the discharge point is properly detailed — this is common for small balconies; (2) Connect to the building's stormwater plumbing system — this is required for multi-story buildings and large terraces. Our drains work with both configurations. If connecting to a waste system, ensure the drain has a water seal (or waterless trap insert) to prevent sewer gases from entering the balcony area. If discharging to exterior, a water seal is not strictly necessary but is still recommended to prevent insect entry.

The number of drains depends on terrace area, local rainfall intensity, and architectural constraints. As a general guideline: (1) Temperate climates (normal rainfall): 1 drain per 15-25 sqm with proper slope; (2) Tropical climates (heavy rainfall): 1 drain per 10-15 sqm; (3) Arid climates (rare rainfall): 1 drain per 25-40 sqm. For a 50 sqm terrace in a temperate climate, we recommend 2-3 drains positioned to create efficient drainage zones. Each drain should have a clear slope path from its drainage zone, with no flat areas or low spots where water could pool.