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Installation - Nailing

Note: Cladding should be kept dry and clean before installation.

When machined profiles are produced from seasoned timber the design of the edge-joint will allow for movement. Such movement is due to seasonal changes in equilibrium moisture content. (Equilibrium moisture content is the percentage of water content in a solid material.)

Good quality of work is sufficient to compensate for slight expansion and contraction in use. Nails should be placed so that movement of boards caused by changes in moisture content does not create sufficient stress to cause timbers to split. Individual boards must not be nailed together at the lap.

Diagrams showing two different ways cladding can be nailed - ship-lap or channel, and weatherboard. In the first each sheet of the cladding has a tongue at the top and a groove at the bottom, and is nailed into the stud with two nails, set 25 mm from the top and bottom of the exposed part of the sheet. With weatherboards, each board overlaps the one below by approximately 30 mm and is nailed into the stud approximately 35 mm from the bottom of the board. Full length packing is inserted behind the bottom of the lowest weatherboard.