Service Details

Balconies rooftops, pools/spas, decking, pool surrounds, retaining walls, car parks, and planter boxes must be waterproofed.


The need for rooftop waterproofing

All the external areas of a building are directly exposed to high, low, or medium temperature and other natural stress related to weather resulting in leaks to external or internal areas and structures leading to safety risks. 

Reasons for outdoor water damage

Water penetrates the substrate and its surrounding if the tiles are loosely packed or cracked.

Failed waterproofing is nothing but damages caused to the tiles at the time of construction, poor preparation methods, incorrect procedure of installation, temperature changes in various weather conditions that increase the chance of water penetration causing moisture to the structure or building.

In the case of decade- or century-old buildings, chances of water leakage are more as lack of technology in the olden days. Thus, unprotected structures may experience damage due to the penetration of water. 

Why choose GJK Waterproofing?

  • We have been around for a long time due to our dedication to offering the best waterproofing service in the market and our commitment to provide a complete package that is easy to understand and flexible for all of our customers.
  • We have been waterproofing residential and commercial buildings in Sydney for over 25+ years. Our goal is to deliver a perfect job the first time, every time.
  • An unmatched combination of experience, skills, passion and innovative spirit has resulted in GJK’s current position as the leading waterproofing company in Sydney.
  • GJK Waterproofing is the number one local waterproofing company in Sydney, specialising in rooftop waterproofing for leaky roofs, damp garage, mould on ceiling, water damage, water leaks and a lot more. 
  • Everything we do is about your protection, satisfaction and peace of mind. Our team of expert waterproofing contractors will keep you safe, inform you about the work being carried out and help ensure a professional job is done.


To arrange an inspection or a quote for any rooftop waterproofing services, please don’t hesitate to contact us by phone or an online enquiry form. Call GJK, the best rooftop waterproofing in Sydney, now for a consultation!