Storm Damage to Thwaites Brewery - Case Study
1st September 2014
Under 1 Roofing Consultants were called to site following some extreme weather conditions that had caused approximately 50% of the waterproofing and insulation to be lifted from an exposed roof area at Thwaites Brewery, Blackburn.
Under 1 arranged for the roof to be temporarily sealed then went about assessing the cause of why the system failed and what measures would need to be taken to prevent this from re-occurring.
Clearly, the damage had been caused by a strong wind blowing through the site, creating a vortex and ripping the waterproofing from the roof area. Although the conditions were clearly extreme, there are some poor designs which have contributed to the damage.
The main reason for the failure of the system was the omission of mechanical fixings. Shown here is a photograph of a mechanically fixed waterproofing system, with the insulation being fixed with appropriate fasteners. The number of fasteners required is dependent on the height of the building, the weather conditions of the local area, the weight of the new system, the condition of the roof deck and so on. No fixings were in place on this roof area!
A further contributory factor was the poor perimeter detail. The perimeter capping had not been sufficiently fixed, resulting in an insecure fix at this critical detail.
Under 1 were then asked to write a bespoke Specification, working within the clients budgets whilst ensuring the correct, suitable system was put in place.
We then put this out to tender, undertook a tender analysis and managed the project, acting in a Clerk of Works role. This included a pre-start meeting, followed by weekly site inspections and the final inspection to sign off the works.
Under 1 took on the responsibility of re-waterproofing this critical building and acted quickly, whilst ensuring the works were carried out effectively and within budget. We then monitored the works to ensure they were to a high level of workmanship.