Jointing method and connection details

Because of the large scale element dimensions joining points such as butt joints or building component connections appear in limited mass. Nevertheless their professional implementation is important for the static and structural-physical functionality of the building. Whilst, from the statical point of view, a force-fit connection is required for the forwarding of stresses between the individual construction components, at the same time it is necessary to ensure that the impermeability of the connections for sound insulation, fire protection and airtightness of the building shell is guaranteed.
The statical requirements are usually achieved through conventional pin shaped fasteners. Refered to here are, primarily, self boring full thread screws which, because of their easy handling, guarantee a simple installation and thereby create efficient connections. Frequently self boring full thread screws are also used in joints with steel components. They achieve their greatest efficiency when they are stressed in the direction of the screw axis, however, stresses at a right angle to the member axis can be applied. Moreover drift bolt and/or bolt and close tolerance bolt connections as well as, in rare cases, connection by means of specially constructed anchor bolts are possible. Since the load bearing behaviour of the mentioned fasteners in combination with cross laminated timber differs in comparison to solid wood construction components because of joints and the variable orientation of the neighbouring board layers, the necessary input parameters for dimensioning such as the embedding strength or resistance to withdrawal force are given in the general building control permits. Thus, in combination with the corresponding dimensioning standard, the load bearing capacity can be proven.

To achieve the required impermeability of the connections usually different types of sealing bands are used. With surfaces that are not visible the construction component joints and connection joints can be bonded conventionally with suitable adhesive tape. Further notes concerning the implementation of connection details are to be found in the manufacturer specific documents.