Efficient Anchors for Building with CLT

Larger screw holes for faster installation

Until now, most anchoring systems originated from traditional CLT-producing countries. However, construction methods and mindsets there differ from those in the Netherlands. Here, it's not only about structural strength—efficiency plays a crucial role as well.

“In foreign anchors for primary load-bearing structures, the fastening holes are often relatively small,” Arjan explains. “You can secure them with nails or small screws. But nailed connections aren’t demountable, which is often required in Dutch timber construction. Moreover, installing numerous small screws is time-consuming.”

For that reason, GB developed new anchors with larger screw holes (Ø6 mm and Ø8 mm). The dimensions and edge distances of the anchors have been optimized to require as few screws as possible—without compromising structural performance. Various specialists carried out extensive calculations to support this.

“With roughly half the number of screws, you can now achieve comparable performance,” says Arjan. “While thicker screws are slightly more expensive, you ultimately save on labor and install much faster. We designed the system around standard screws that are widely available—so no special or brand-specific products are needed.”