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What must be done prior to installing vertical vinyl siding to a wall?

  1. Install horizontal strapping at 600 mm (24") o/c.

  2. Install horizontal strapping at 1200 mm (48") o/c.

  3. Install vertical strapping at 400 mm (16") o/c.

  4. Install vertical strapping at 600 mm (24") o/c.

The correct answer is: Install vertical strapping at 600 mm (24") o/c.

Prior to installing vertical vinyl siding on a wall, it is important to install vertical strapping at 600 mm (24") o/c. This is because horizontal strapping, as mentioned in options A and B, will not provide the necessary support for the vertical siding. Installing vertical strapping at 400 mm (16") o/c, as mentioned in option C, will create more work and use more materials without providing significant benefits. Therefore, option D is the most effective and efficient choice.