Standard value of tensile bearing strength from each fastener. K/N
After insulation board is adhered securely, normally fasteners are installed 24 hours later according to different temperature and humidity. Holes can be drilled by impact driller according to design requirement. The depth for the drilled holes are more than 30mm from base wall and the surface dust cannot be calculated into the hole depth. The bore diameter is normally determined at 8mm or 10mm according to the diameter of sleeve tube from fastener. Fasteners should be tightened and the nut from fasteners should be as flat as the insulation board surface or slightly tightened further into to make sure the fasteners and base walls are fully secured.
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