Insulation board e.g. for prefabricated concrete articles has web left in edge region weakened by groove and acting with object to cause deformation or break-out

摘要

The insulation board (1) has a side surface (12) bounded by edges (13, 14). It has at least one groove (2) bounded by side batten-like webs (3). The webs left in the edge region (16) are weakened by the grove, so that the deformation of the webs acting with an object causes a deformation or break-out in the web.