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Roof Condition Survey in Oxford

  • Writer: Carolyn Markham
    Carolyn Markham
  • Nov 2, 2023
  • 2 min read

Building leaks can equally occur in new build as well as existing properties and Thornton Consulting were recently appointed to undertake our Building Leak Investigation and Roof Condition Survey services to a restaurant roof in Oxford.


The building was approximately 3 years old and had been experiencing an internal leak for more than a year.


The building leak investigations process was undertaken to locate the source and cause of a leak and combined a number of test techniques to positively identify the source of the water ingress. Tests included:


  • Roof moisture profile

  • Electronic test of the waterproofing membrane

  • Simulated rainfall test, incorporating a trace dye

  • Internal monitoring of the leak site for change in moisture and water ingress

The leak source was identified as a breach in the single ply waterproofing which was later repaired by our client’s roofing contractor and re-tested to confirm its integrity.


Our client also required peace of mind that there were no further issues with the roof. We, therefore, undertook a Roof Condition Survey to the whole roof to confirm the integrity of the roof waterproofing and establish any potential items of concern.


Roof condition surveys assess the current performance and condition of a roof and can provide an indication of the remaining lifespan. A number of different test techniques can be employed depending on the specific requirement of our clients, but the service can include:

  • Electronic leak detection of the waterproofing membrane

  • Roof moisture profile

  • Visual inspection and assessment of condition and projected lifespan

  • Technical audit of the roof

  • Core samples

  • Comprehensive report with images and drawings

A roof condition survey is equally important to property owners, facilities managers or anyone else who has an aged flat roof looking to prepare a budget for replacement or repair. The survey will not only provide information on the roof covering but can also include other items which are considered to be potential points of water ingress into the structure.


Thornton Consulting can assist in prolonging the serviceable life of a roof, where necessary, by incorporating this into a roof maintenance programme and ensuring the correct remedial works are undertaken to prevent internal leaks.


Thornton Consulting undertake Roof Condition Surveys to most types of waterproofing, including:

  • Mastic asphalt

  • Built-up felt

  • Single ply

  • Hot melt

  • Liquid applied waterproofing

If would like further information on our Roof Leak Detection or Roof Condition Survey services, please contact our office on 01342 410508, or use the Contact page to get in touch.

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I’ve worked with Thornton’s team for nigh on 10 years and I’m yet to be disappointed by any aspect of their business or interaction with any of their staff.  I feel that the collaborative approach we have when working together not only benefits our site in a speedy response and solution, but it also strengthens our relationship with our onsite client team, building in faith that together we can self-solve most, if not all issues.  Working with Wendy and the onsite teams is nothing short of a pleasure. I would highly recommend using Thornton Consulting Group for all investigative services when it comes to finding leak issues.

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