WALL TO FLOOR CONNECTIONS
Knowing that lateral loads are also transferred by walls into the floors or slabs beneath, the connections of the walls to the floor must be to expected strength. Any joints or connects not fixed well become a point of weakness to the entire structure. One must therefore understand the different connection methods and choose the most effective during construction.
1. Use of self-tapping screws
Self-tapping screws are driven from the CLT floor directly into the narrow side of the wall edge or driven at an angle to maximize the fastening capacity in the panel edge when connecting a floor to a wall below it or a roof. Driving these screws at an angle can also be done to connect walls above to floors below. Depending on the angle and the length of the screws, the self-tapping screws could reach the bottom walls, further reinforcing the connection between the upper and lower walls and the floor
2. Use of metal brackets
Metal brackets are when used help to connect floors to walls above and below and also transfer, lateral loads from wall to another. These can also be used to connect roofs to walls while nails and screws can be used to fix the metal brackets onto the CLT panels.
Concealed metal plates
Concealed metal plates are hidden metal plates placed at the bottom of the CLT but require that the timber panel has grooves to conceal the metal plates. This to be done dictates that precise profiling be done using CNC (Computer Numerical Control) machining. Fasteners that can be drilled through both the metal and wood should be used. The use of concealed metal plates improves the efficiency of CLT’s fire resistance as compared to use exposed metal plates.
Use of a wooden ledger
A wooden ledger or a CLT ledger is used to provide a continuous bearing support to the CLT floor panels. The ledger is usually made of SCL (Structure Composite lumber) and is fixed at right angles with the wall and floor with screws.
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