For screwing into COMPACFOAM we recommend screws with a wooden thread and a thick screw core and sharp thread, e.g. typical window frame anchors with a diameter of 6 mm or more. The screw is inserted without pre-drilling directly into COMPACFOAM screwed in. The material displaced by the core is compacted laterally in the screw hole and thus significantly increases the pull-out strength. When screwing in small diameters (<5mm) in lower material classes (CF100, CF125, CF150), the tightening torque must be limited to prevent over-tightening.