Frequently asked questions about the X-fix L wood-wood connection system
What is X-fix L?
X-fix L is a linear timber-to-timber connector for upright CLT walls. With X-fix L, corner joints, T-joints and longitudinal joints of wall elements are possible, as well as the connection of complete building modules in the factory or on the construction site.
X- fix L consists of two dovetail-shaped and conically divided coupling strips with a maximum length of 3 meters. The dovetail-shaped grooves of the walls to be connected are placed in relation to each other and positioned correctly. The first part of the X-fix L coupling strip is inserted from above with the thick side first and falls into the cut-out.
The second part of the X-fix L is then inserted with the thin side first, falls quite easily into the cut-out until the two-sided conical connection fills the cut-out, is pushed in slightly by hand until only approx. 50 cm protrude. Then the second part of the X-fix L is carefully hammered in with a soft-face mallet until the wall elements are securely connected. The connection is complete!
Advantages of X-fix L?
Compared to conventional screw connections, X-fix L connects the components with a continuous, linear and form-fit wood-to-wood connection and has up to 300% greater strength than conventional screw connections. When assembling CLT wall elements, X-fix L is inserted into the connecting grooves from the inside of the wall.
In principle, no external scaffolding or working platform is required for the construction of a building shell, as X-fix L can be used from the inside of the building. The labor saving compared to screwing the walls from the outside of the building with wood screws is enormous and makes X-fix L a cost-effective connection system.
X-fix L is used for assembling corner joints (butt joints but also mitered joints), for T-joints and longitudinal joints of cross laminated timber wall elements. X-fix L is inserted and driven in from the inside of the building, so in principle no external scaffolding or working platform is required for the construction of a shell. The cost and time savings in the significantly easier handling of X-fix L compared to screwing the walls from the outside of the building with the corresponding wood screws certainly outweigh any additional costs of X-fix L.
For easier installation, we recommend lightly moistening the tapered cut surfaces of X-fix L with an appropriate adhesive. This allows the second clamping element to slide into the cut-out and the remaining clamping distance of approx. 30 - 50 cm can be easily hammered in with a soft-face hammer (approx. 2 kg). The hardened adhesive also provides additional security.
Examination & approval:
Types and milling patterns:
X-fix L 50/80/3000 --> PDF - milling image
Requirements for CLT panels and joinery:
To avoid misalignment of the wall connections, the thickness of the CLT panels must be calibrated (ground) before the X-fix grooves are milled. The X-fix L grooves must be milled on a suitable CNC machining center using the tools specified by X-fix . It is important that the workpieces are guided or clamped in a fixed position.