An attachment plate (1)is used to attach insulation panels (57) to building substrates (59) using an internal combustion cordless nail setting tool (55) loaded with nails (77) held in collating strips (79) for feeding and holding them in a magazine. The attachment plate (1) has a washer (2) and an annular chamber (51) at a first end. A wall of the annular chamber is defined by a band of fingers. The interior of the attachment plate (1) has a recess (30). The attachment plate (1) second end has flexible tabs. The attachment plate (1) is placed on a pilot (67) and against a flange (65) of a tool adapter (63). The attachment plate (1) is pushed into the insulation panel (57) such that the tool muzzle bends and passes through the fingers (45). When the tool (55) is fired, a nail (77) and nail collating ring (79) are forced into and captured within the recess (30). The tabs (41) bend against the substrate (59) if the insulation panel (57) is of less than nominal thickness.