Blackheath

Background  

The Blackheath project involves the expansion of an existing block of flats to add an additional storey, with the existing structure consisting of a three-storey block of flats with a ground floor designated for commercial use, while the second and third floors are residential flats. 

The developer, Latin Quarter, had previously worked with another engineering firm but sought a second opinion due to concerns about the weight of the steelwork in the preliminary design presented Latin Quarter reached out to Re-Structured to assess the preliminary design plans to ensure they were achieving the best outcome for their client, and their design.

Assessment 

Upon receiving the project, our team conducted a comprehensive assessment of the existing engineering plans. Our report highlighted various areas of improvement where steel could be reduced without compromising the integrity of the project.

We then presented a high-level sketch scheme to the client, outlining their approach and highlighting the benefits of a new design, including the reduction of steelwork. During an in-person meeting, the team explained the proposed works and emphasized the ease of construction and the significant reduction in steelwork that their scheme offered compared to the existing design.

To ensure lateral stability, our engineers proposed strengthening the existing structure internally forming new blockwork walls around the existing staircase, which were also required as part of the architect’s proposals for fire performance with the introduction of the additional storey. 

The initial proposal included an extensive frame at the rear spanning all floors to the new third floor. However, upon further analysis, we identified an alternative solution by introducing internal elements and utilizing engineered timber joists. This approach allowed the removal of intermediate structure and provide support from party wall to party wall, reducing the need for excessive steelwork. Reducing the total weight of steel by 49% compared to the initial plans, and an 861kg reduction of timber.

Outcome

Engineered timber joists that can span further distances have been introduced, eliminating the need for intermediate steelworks and providing clear spans throughout the property.

Significant cost savings and improved efficiency in the construction process are anticipated by implementing design changes. The steel reduction of 3,145kg is equivalent to over 90 tree seedlings grown for 10 years worth of carbon sequestered.

Overall, the design  have addressed the client's concerns regarding the heavy steelwork, the reduction in steel saved the client over £20,000. The project is now on track to achieve a successful outcome, with improved stability, reduced construction costs, and increased efficiency. We are committed to working closely with the client throughout the project's lifecycle to ensure their satisfaction and deliver a high-quality finished product.