Building Diagnosis Centre Pty Ltd

Building Diagnosis Centre Pty Ltd Sydney

Sydney building experts striving for professional excellence since 1976.

Solving defective non-compliant damaged buildings, structures and waterproofing throughout Sydney Northern Beaches to Eastern Suburbs.


Roof Waterproofing Membrane Replacement

Remedial Solutions for Building Waterproofing Faults & Complaints

Your in good hands with our Sydney chartered accredited diagnostic consulting building and waterproofing experts and licensed master builders.   

We have decades of experience in damaged buildings, construction, rectifications and drafting expert reports etc.

Clients are property owners, strata and facility managers, lawyers, licensed builders and real estate agents.


Inspection of rotting timber plywood sheet substrade to this building.

We assessed rotting was caused by defects in the liquip waterproofing membrane.  Our inspector recommended the client to replace the 10 year young failed waterproofing system and new floor tiling as tiles were damaged from the rotting timbers.

We recommended the following system:

  • Ardex WPM 1000 (BCA NCC compliance)
  • Is the Weldtec External Undertile Waterproofing Rubber Membrane
  • The membrane has a 20 year warranty.



Fault in waterproofing - Inspected by Building Diagnosis Centre

A Sydney leaking roof deck prior to being replaced.

At our inspection we advised replacing the failed liquip  waterproofing with Ardex WPM 1000 (BCA NCC compliance) Weldtec External Undertile Waterproofing Rubber Membrane and with a mimimun 20 year warranty.

Summary of Our Expertise

Our independent chartered accredited experts, specialise in providing independent expert ‘on-the-spot’ opinion advice solving causes of damaged buildings, design faults and defective non-compliance work.

We draft scope of works and settle building dispute claims where ever necessary without involving NSW Fair Trading or NCAT. Compile expert solution reports and photographic evidence from our detailed building surveys.

With building disputes and claims, our reports meet the requirements of Fair Trading / NCAT and the Master Builders Associations of NSW.

We can discuss how we can help with your building issues or your clients.

Call us today on 0408911210 and talk about it with:

Robert Speirs-Ferrari one of our senior consultants.