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Actually the wall plate is not a plate but a rectangular timber. The purpose of the wall plate is to accommodate the wooden beams of a framing, to ensure a uniform bearing height and to better distribute the bearing force over the bearing.
A rectangular timber with a cross section of b/h = 100/80 mm2 or 80/60 mm2 is used as wall plate.
Is the wide or small face of the rectangular timber used as bearing surface of the wall plate?
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In order to prevent axial or lateral displacement of the wooden beams, the beams are cogged in the wall plate or are secured by means of a pin connection.
The wall plate is mainly necessary in brickwork construction. On a 240 mm thick wall, the wall plate is to be mounted flush with the inner wall line.
Figure 13
(1) wall plate mounted flush with the inner wall line
(2)
wall plate displaced to the centre of the wall
(3) wall plate mounted flush
with the inner wall line and provided with plaster base
1 wall plate, 2
plaster base (wood-wool board), 3 barrier layer under the wall plate
Why is the wall plate to be mounted flush with the wall line?
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On a 365 mm thick or thicker wall, the wall plate may be displaced towards the centre of the wall, i. e. it is to be displaced inwards as much as to leave enough room for the wall plate to be faced with a plaster base.
Why must the wall plate be faced with a plaster base?
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Sling fabric or Rabitz fabric may be used as plaster base for flush-mounted wall plates. A strip of woodwool wall board may be used as plaster base for non-flush wall plates.
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