Sansom has successfully completed numerous high-profile roofing projects

Delivering waterproof roofing solutions that make structures last

As a trusted and approved applicator for leading suppliers of torch on membranes, we ensure top-quality results in every project. With our advanced Mini Macaden technology, we can efficiently apply large volumes of torch on membranes, saving time and improving project timelines. As part of our commitment to quality, we offer a comprehensive quality assurance service using EFVM electronic testing to ensure the roofing system’s integrity.

We deliver effective waterproofing, safeguarding the structural integrity of carparks against potential damage from water ingress and wear and tear.

We provide precision-applied waterproof membranes for balconies engineered to protect these exposed areas from harsh weather elements and water damage.

Waterproof roofing solutions at Sansom

Our expert team specialises in both sheet and liquid membranes, showcasing an unparalleled depth of knowledge in every project. With expertise in addressing a range of waterproof roofing needs, we offer comprehensive solutions for flat roofs, warm roofs, green roofs, carpark membranes, and balcony membranes.

Our true and tested strategies are applied to every roofing project, ensuring our processes align with established standards. Whether it’s maintaining thresholds or ensuring precise overlapping of membrane rolls, every detail is meticulously handled.

These comprehensive checks form a critical part of our QA protocol.

why sansom


Over the years, Sansom has successfully completed numerous high-profile roofing projects in Auckland, including iconic landmarks like Skycity, Sky Tower, Aotea Centre, and the Auckland City Library’s green roof.


We perform thorough QA checks with ILD New Zealand, conducting Electric Field Vector Mapping (EFVM) tests. These tests assess the integrity of the membrane, checking for any mechanical damage or potential water ingress points. These stringent quality checks provide an assurance that your roof is not just superficially fit but structurally sound and reliable.


Equipped with multiple state-of-the-art self-propelled, self-guided machines operated by a team of membrane specialists, we have the capacity to weld bituminous membranes and cover over 700m² per machine per day.

What Our Clients Say…

Roofing Client

‘Your diligence, attention to detail, very helpful communication, and very pleasant manner make you an amazing person to deal with. A true gentleman too.’

Chris Hunter

Managing Director - NZ Strong

We write this letter in gratitude for the combined efforts Sansom Ltd provided in the completion of the Hobsonville Data Centre.

Concrete Remediation Client

“Many thanks to the Sansom team members responsible for the efficiency and professionalism shown in undertaking the concrete remedial works, with the high quality of workmanship also being greatly appreciated by the Church.”

Alain Venuto

Site Manager, Naylor Love

Sansom is a company that has truly exceeded my expectations with their outstanding performance and exceptional workmanship.


Phillip Helleur - AJ Spicer

Hawkins are pleased to be able to provide this testimonial for Sansom for their excellent work at the Totara Haumaru Northshore Hospital project for Health NZ Waitemata.

Roofing Membrane Products

Affiliates and Alliances

  • Allnex Bituthene 3000 & 5000, Situclad EWS,
  •  Terraflex & Ultratuff
  • Allco Casali, Bitumen Membranes, Hydrotech MM6125,
  •  JM TPO
  • Ardex Butynol, TPO, Bitumen & WeldTec Membranes
  • Nuralite Nuraply 3PM, TPO, 3PG & 3PC Membranes,
  •  Bituthene 3000 & 5000 Membranes
  • Sika Sarnafil Membrane, SikaProof i-Cure, Sikalastic Coatings
  • Viking Bitumen, Enviroclad Membranes
  • Equus Soprema & De Boer Membranes and Coatings