Rooftop Waterproofing

Why is rooftop waterproofing necessary in Singapore?

Rooftop waterproofing is especially necessary in Singapore because of these key reasons below.

High Humidity

• Constant humidity (70–90%) keeps surfaces moist.
  
  

• Moisture can seep through cracks if roofs aren't properly sealed, leading to mold, mildew, and structural weakening.
  

Extreme Heat and UV Exposure

• Singapore gets strong sunlight year-round.
  
  

• Thermal expansion and contraction from heating during the day and cooling at night cause materials to crack over time — waterproofing helps absorb movement and prevent cracks from becoming leak points.

Heavy and Frequent Rainfall

• Singapore has a tropical rainforest climate with high annual rainfall (over 2,000 mm per year!).
  
  

• Without good waterproofing, rooftops easily leak and cause water damage inside the building.
  

Urban Density

• Many buildings in Singapore are high-rise or have flat roofs (which are more vulnerable to water ponding).

• A damaged rooftop can quickly affect multiple units, especially in condominiums or HDB blocks.
  
  

Regulatory and Building Standards

• Building codes in Singapore often require proper waterproofing for new and renovated buildings to meet safety and quality standards
  
  

Protects Investment and Reduces Repair Costs

• Early waterproofing prevents costly repairs later — fixing internal leaks, replacing damaged ceilings, repainting, etc., is much more expensive than good initial waterproofing.
  
  
  
  

Essential for Rooftop Gardens and Solar Installations

• Green roofs and solar panels are getting more popular in Singapore's eco-friendly movement.
  
  

• These setups need even stronger waterproofing to handle extra weight and moisture.
  

Type of Properties

Internal Wet Areas: Commonly used in bathrooms, kitchens, and basements to prevent water seepage.

Water Storage Structures: Ideal for waterproofing water tanks and reservoirs.

Concrete Surfaces: Protects foundations, walls, and roofs from water damage.

Benefits of
rooftop waterproofing

• Cost-Effective
  Cementitious waterproofing are relatively inexpensive compared to other waterproofing methods and are ideal for large surface areas, such as basements.
  
  
  

• Resistant to Positive and Negative Water Pressure Cementitious waterproofing are high resistant to water coming from both sides and especially important for underground structures.
  
  
  

• Low Maintenance
  Once applied, cementitious waterproofing requires very little upkeep or monitoring over years.
  
  
  

• Customizable
  Cementitious waterproofing can be modified with polymers or acrylic additives, allowing this method to be more flexible and crack-resistant.