EXTERNAL ENVELOPE 53 Breaking the spec breakers
Product substitution, otherwise known as ‘breaking spec,’ threatens building performance and raises lifecycle costs. David Grace of K Rend highlights how manufacturers can help protect specifi cations to ensure design integrity.
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hen a specifi ed product is substituted and changed for one that is believed to offer similar
performance, it can result in the application of value engineered products which don’t have the same benefi ts. For example, thinner specifi cations can lead to poor longevity, thereby undermining a building’s performance, and in the longer term affecting its lifecycle costs. Substitution may also invalidate contract conditions and, in the worst case, expose people to signifi cant liabilities in the event of product failure. Ultimately, it disrupts the specifi er’s vision and design intent, leading to a mismatch between the intended design and the fi nal built outcome.
Render choice
The choice of render is one area that can be particularly susceptible to the perils of product switching. A fundamental component of building envelopes, render plays a pivotal role in the overall performance and aesthetics of a structure. However, improper specifi cation or application of render can lead to a cascade of issues that haunt projects for years to come. From poor fi nishes to premature deterioration, these problems not only compromise a building’s integrity but also result in substantial remedial costs down the line.
While a value engineered solution may seem like an attractive option upfront, the long-term implications can be devastating, impacting the durability, longevity and quality of fi nish. Failure to adhere to the manufacturer’s technical specifi cation and application guidelines can also result in certifi cation being invalid, leaving the project vulnerable and the housebuilder liable. Moreover, remedial work to address issues like cracking, delamination, or an uneven fi nish can far outweigh any initial savings. For example, failure to use mesh
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around window and door openings can result in cracking or delamination.
The manufacturer’s role Many manufacturers understand the vital need to protect specifi cations. By offering comprehensive support and resources throughout a project, they aim to ensure the correct product is used and applied as per the application instructions, safeguarding the integrity of the design. This multifaceted approach includes providing detailed technical specifi cations, clear application guidelines, and on-site assistance from a team of application specialists and R&D experts. This vision is clear – to enable the most appropriate choices and practices to deliver a fi rst-class experience for everyone in the project chain.
Bridging the skills gap To address the skills gap in the industry, some manufacturers have also launched training programmes to equip applicators
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Render plays a pivotal role in the overall performance and aesthetics of a structure
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