available in a minimum depth of 1.5 in. (38 mm). Floor section design should address this minimum depth. The design team should plan for partition construction and relocation if likely to occur. Partition bottom channels will likely be secured to concrete slab with shot fasteners. Fasteners can penetrate tubing embedded in the topping slab. If partitions will not move, plan tubing routing to enter rooms through doors rather than crossing walls. If partitions may be moved or installed later, consider increasing the depth of the topping slab, or specifying short fasteners used with mastic to secure bottom channel to slab. The engineer should coordinate location of slab sensors and conduit connected to them with radiant tubing layout. Proper location of the sensor may involve crossing the floor tubing. The crossing may have implications for the required coverage depth of the topping slab over the tubing. The sensor installation should accommodate removal and replacement of sensors should they fail. Finally, while radiant floor tubing may cross contraction control joints created to control random cracking and construction joints caused by phased construction, they should never cross expansion joints that can experience far greater independent vertical and horizontal movement of the slab sections. www.info.hotims.com/44630-5 60 ASHRAE Journal Photo 3: Syracuse University School of Management atrium, radiant heating and cooling layout. Conclusion The technology of thermally active slabs has become increasingly popular over the last few years and is being applied in many challenging climates. This system can be very effective for a number of applications, ranging from highly glazed sunspaces, to super-insulated residential buildings. One of the consummate examples of the application of this technology is the main floor www.info.hotims.com/44630-52 March 2013