Curtins have worked on buildings with the highest containment levels, such as The Institute of Animal Health in Pirbright which provides Cat 3 level containment laboratories within the £100m facility.
These buildings impose design constraints over and above what is normally encountered on a building, making it essential that the designers are both aware of them and capable of responding to them. For example, enhanced crack control within the concrete needs to be considered, along with a much greater services loading associated with the mechanical ventilation strategy. Negative pressure zones are also created, developing unusual forces on the internal structural elements. Complex drainage strategies are often required, with separated drainage networks and attenuation tanks a common need.
Working on buildings of this nature requires the designer to be fully aware of these additional design constraints to ensure the design is properly understood at the outset of the project.