18m core test is carried out on construction panel after the panel was grouting after 7 days. The panel has been cored randomly by 18mm diameter (inner) standard flow drill. The drill should right angle of surface at perpendicular joint in order to cause minimum damage of setts. 18mm core is observed as penetration quality and depth of the joint filling grout through the construction panel. It will also can be defined the tolerance of laying course. The test report is including: identification of test specimen, depth of the specimen, failure pattern, date of test.