Leading Timber Defect and Decay Consultancy Inspecting Timber Bridges & Structures

Delivering the most advanced timber bridge surveys and repair solutions


We do this

Assess the condition of your glulam timber footbridge


Which does this

Establishes condition and informs remedial specifications


Giving you this

A safe bridge, extending its service life

... leaving you free to move on

Prolonging the service life of timber bridges and structures

If you have concerns about timbers, but aren’t sure where to go for help?
Good news, you’ve just arrived at the right place.
We investigate the condition of timber footbridges and structures in public spaces, evaluating all solid and engineered timber (glulam) components, providing repair solutions that help prolong their service life.
Whether it is evaluating the extent of decay in the ends of stringer beams, main beams or treads, we have the experience and expertise to provide a meaningful appraisal of the condition of timber components.
  • Advanced timber surveys 
  • Non-destructive testing condition assessments
  • Difficult access solutions
  • Informed recommendations
  • Repair & maintenance

Sensitive solutions for complex problems

We collaborate with structural engineers and other stakeholders to deliver best-practice solutions to often complex construction problems, considering the most sensitive solutions when specifying remedial repairs, coatings and treatments. 
We follow a least-invasive approach to inspecting, testing and repairing timber footbridges over watercourses and other sensitive ecological environments.
  • Canals
  • Rivers
  • Marine
  • Lakes

Timber Bridge Surveys

Our non-destructive condition assessments will evaluate the extent, severity and location of timber decay.

Non-destructive condition assessments, inc:

  • Microdrill resistance testing
  • Ultrasonic decay detection testing
  • Wood moisture content analysis
  • Timber Species identification
  • Fungal and beetle species identification

Our detailed reports discuss the causes of decay, record which timber components are affected by decay, and the extent of timber needing repair, reinforcement or replacement.

    Solutions for difficult access

    Gaining adequate access to inspect and repair timber bridges and large outdoor structures can often be challenging due to height or water scenarios, HarperBD and our access partners have always found a way.
    • Rope access
    • Suspended scaffold
    • Boat surveys
    • Pontoons

      Repairs - specifications and further support

      We can provide assistance from repair guidance, specifications, supervision to the realisation of the works… whatever support you need, we can help!
      • Timber resin splice
      • Steel reinforcement
      • Replacement sections
      • Targeted preservative treatments

        Designing out defects

        Providing guidance so the same defects are not repeated in the repair schedule.


        Our maintenance guidance will help reduce long-term costs and prolong the service life of your timber structures.

        Click for 'An Introduction to Glued Laminated Timber' which in gives further guidance on the care of glulam.

        FAQ's regarding our timber services can be found here

        Do you need to know the condition of timbers?

        ... we know our stuff & provide the expertise you require to move your project forwards,

        it's  quite simple really

        Explore more of our super solutions
        Further reasons to work with Harper Building Diagnostics

        As a leading building pathology & diagnostic consultancy we work with clients all over the UK and ... beyond

        We provide transparency, great communications and excellent support

        We're proud to have many clients who consider us part of their team

        We regularly present at industry events and professional CPD seminars

        What past clients have to say,

        "Glulam is a wonderful product, it excites architects it would appear and they use it to come up with wonderful ideas and projects. My house is supported by and has design features in Glulam. Sometimes however, if it is not properly installed or maintained, it goes ‘wrong’, horribly wrong.

        To begin with we did not realise we had ‘rot' how could such a young structure be falling apart?
        I am not sure quite how I met Lee Harper but I am so pleased I did. He visited my property and meticulously surveyed my problems. He was equipped with an array of scientific instruments and he carefully measured and assessed my property. His initial politeness and courtesy implied a man who was an expert in his field. He indeed is.
        Lee’s next step was to thoroughly explain what had gone wrong and to identify a range of remedies. 
        Trust is important in every business relationship but at an early stage I became convinced I could trust Lee. I was not wrong.
        The repairs Lee masterminded were delivered in timely and super efficient manner. He kept me informed as to issues and was always willing to discuss alternative solutions. The finished job was excellent.

        I have no hesitation at all in recommending Lee Harper. To find a man you can trust in todays construction industry is a valuable commodity and Lee Harper and all his team can be trusted. I wish his business every success."

        D. Elliot, Devon

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