Repairing and Waterproofing a Balcony

Assessment and Inspection: Begin by thoroughly inspecting the balcony for visible damage, cracks, or signs of water intrusion. Pay attention to the balcony surface, railing, and any nearby walls or structures. 

Crack Repair: Address any cracks or gaps in the balcony surface promptly. Use a suitable concrete or masonry repair product to fill and seal these areas. Ensure the repaired surface is smooth and level. 

Railing and Structure Inspection: Inspect the balcony's railings and structural components for signs of rust, corrosion, or deterioration. Replace or repair any damaged or weakened elements to ensure safety. 

Flashing Installation: Install metal flashing around the perimeter of the balcony, where it meets the exterior wall of the building. Properly installed flashing helps divert water away from vulnerable areas and prevents moisture intrusion. 

Waterproofing Membrane: Apply a waterproofing membrane to the balcony surface. This membrane creates a protective barrier that prevents water from penetrating the concrete or substrate underneath. 

Sealing Penetrations: Seal any penetrations in the balcony surface, such as anchor holes or joints, using a high-quality sealant or caulk designed for outdoor use. Ensure a watertight seal to prevent water from seeping through. 

Railing Flashing: Install flashing or a waterproof membrane at the base of the railing posts where they meet the balcony surface. This prevents water from infiltrating the post holes and potentially causing damage.