The adaptive re-use and refurbishment of existing structures is a trend gaining popularity in the Irish construction market. DBFL has in-depth experience in this sector and were pleased to be given the opportunity by Hines to work on the Two Grand Parade Project which involved the upgrade and refurbishment of an existing protected structure along with the construction a new 6-storey building.
Two Grand Parade is a 9,600 m2 commercial development which included six storeys of new prime office space over a single level basement. The new steel framed building is linked via a glass atrium to the iconic 8-storey former headquarters of PJ Carrolls which overlooks the Charlemont Luas Stop and the Grand Canal in Dublin.
The existing structure, constructed in 1962, had exceeded its original design life. Hines sought to extend the life of the structure rather than demolish and re-build, and thus saved thousands of tonnes of embodied carbon emissions. The structure was assessed, analysed, restored and upgraded to meet all the standards of a modern office building with LEED Platinum status and BER A3 targeted for the scheme.
Various investigations were conducted during the assessment of the existing structure to determine what restoration measures were required. This included a visual inspection of the main structural elements, cover meter surveys and the cutting of several concrete cores which underwent chemical tests to detect signs of degradation.
Following the assessment, selected structural elements were then restored and upgraded. Stiffening elements were added to the steel beams to facilitate new openings and allow the efficient integration of services. The steel beams were sandblasted to remove any damage and defects to the steelwork along with receiving a coat of intumescent paint. The soffit of the concrete floor slabs were sandblasted and treated with an anti-carbonation coating. Additional structural elements were introduced in localized areas to accommodate service requirements for a modern office building. The existing stairs were strengthened to allow both the flights and balustrade to be retained and reinforced concrete walls were constructed for two new lifts.
The site is ideally situated for integration with various forms of sustainable transport including Luas, Dublin Bus, and bike share schemes. In addition, the Two Grand Parade site is intended to serve as the location for the final stop of the proposed metro line. With this in mind, part of the project involved the design of structure to allow the future construction of a metro station beneath the footprint of the Two Grand Parade site. This structure would serve to reduce the potential disruption and need for future demolition during the construction of the metro station. DBFL and the wider project team were part of discussions with Transport for Ireland to allow for a station based on the proposed route and assist with aspects of the public consultation process. Recycled GGBS material was utilised in the concrete mix design for the large concrete pours during the construction of these elements.
The new six storey steel frame structure utilised Westok castellated steel beams. The economical design methodology and castellated nature of these beams enables savings in steel tonnages when compared to other methods of steel design. The castellated nature also allows for efficient integration with various building services and a reduced structural floor depth being required for each floor. Green roofs were utilised as a SUDS measure to control rainwater flows into the public system in the event of storms.
Active Travel Promotion: Strategically located adjacent to the Charlemont Luas stop and within walking distance of Dublin’s city centre, Two Grand Parade encourages sustainable commuting options. The development’s integration with the upcoming MetroLink station further enhances accessibility and promotes active travel.
Carbon Reduction: The project achieved LEED Platinum certification by incorporating energy-efficient systems such as micro-combined heat and power (Micro-CHP) units. These systems supply renewable energy to the workspace, significantly reducing carbon emissions associated with traditional energy sources.
Heritage Preservation: The development respects and enhances the cultural landscape by carefully integrating historical elements. The original 1960s headquarters was restored and upgraded, preserving its architectural significance while introducing modern amenities.
In conclusion, Two Grand Parade exemplifies how urban infrastructure projects can be designed to improve sustainability, foster community engagement, and respect the environment. By blending innovative design with heritage preservation, the development provides long-term benefits for public health, mobility, and the urban experience.
Project Director
