Abstract: A module of the type used in insulating the wall of a high-temperature furnace comprising a planar face, a hub joined and extending rearwardly from substantially the mid-point of the surface opposite the planar face, and a plurality of radial members extending outwardly from the hub is described. Preferably the entire module is integral. The module can be used in combination with an attachment which fits over the hub for attaching the module to a furnace wall. Blanketing material can be used with the module to vary the heat-insulating characteristics of the module. The module, which is easily attached to a furnace wall, can be cut along any of its edges without varying the heat-insulating characteristics of the module, permitting the installation of the modules on a furnace wall without substantial pre-engineering.