This Hospital green roofing project came with a number of challenges, but the specified solution resulted in an attractive roofing feature that improves the aesthetics of the building as well as benefiting the environment.
Antrim Area Hospital has undergone the construction of a new £12.4 M Accident and Emergency department, which is one of a number of capital projects currently underway at the hospital. The modern facilities will be well-equipped to provide secure, safe, high quality services to patients, and is due to be opened in early Summer 2013. Part of the structure forms a balcony area which wraps around the building and was designed to provide each overlooking window a view of a green roof system.
The roof areas were quite restricted in terms of access due to the construction work above and scaffolding had to be systematically removed and rebuilt as the project progressed. The roof itself was restrictive as it presented low upstand thresholds, the presence of which had to be taken into account when balancing thermal requirements with creating falls on the roof for drainage. Outlets were repositioned to allow positive falls to be created. Due to the orientation of the building, paved areas were provided where there was reduced sunlight which would have otherwise affected a green roof planted system.
Due to the sensitivity of the site, Icopal put forward a heat-activated system, comprising Icopal Micoral SK vapour control layer and Pyrobar Underlay. An expanded polystyrene (EPS) tapered insulation scheme was used to create efficient falls in the roof system, which also included falls in the gutter areas. The waterproofing was finished with Tecnatorch SBS mineral capsheet, and in areas of green roof Icopal Rootbar capsheet was used instead.
Icopal's sedum solution was specified and allowed for quick and easy installation by the roofing contractor. The sedum solution is already established, giving the roof instant coverage and therefore, finishing the project to the high standards as set out by the client and the architects.