Balcony & Terrace Waterproofing – Why These Areas Fail So Often

Balconies and terraces are some of the highest-risk waterproofing areas in any building.

They are exposed to weather, foot traffic, and structural movement — all at the same time.

When waterproofing fails here, the damage often spreads into:

• Internal living areas

• Structural slabs

• Ceiling spaces below

• Reinforcement steel

  
  

Common Balcony Waterproofing Problems

Incorrect falls

Water should always drain away from the building. Flat or back-falling balconies cause ponding and long-term membrane stress.

Poor edge and door detailing

Leaks often occur at:

• Sliding door thresholds

• Balustrade fixings

• Balcony edges

  
  

If these details aren’t sealed correctly, water bypasses the membrane.

Incompatible finishes

Some tiles, adhesives, and screeds are not compatible with certain membranes, leading to cracking or debonding.

Why Balcony Leaks Are Expensive

Balcony waterproofing failures are rarely isolated. Once water enters:

• It spreads unseen

• Repairs become invasive

• Tiles and finishes must be removed

  
  

Early intervention saves significant cost.

How Proper Balcony Waterproofing Is Achieved

✔ Correct falls built into the substrate

✔ Waterproofing turned up walls and thresholds

✔ Proper detailing at penetrations and balustrades

✔ Drainage considered as part of the system

Balcony waterproofing must be treated as a system, not just a coating.