The clapboard you use for a patch should blend in seamlessly with your existing siding. Here's how to make sure you have a patch that's a perfect match before you begin.

Sizing: Measure the butt-edge thickness and the widths of the exposed faces of a few courses on the wall. Add an inch to the face width to account for the overlap of the piece above. (These measurements will be slightly smaller than the "nominal" dimensions that lumberyards and home centers use. A nominal ½x6 is actually 7/16 by 5½ inches.) If you're not sure what size you need, ask the store to translate your measurements.

Texture: A rustic, rough-faced clapboard will look out of place in a field of smooth siding, or vice versa. Fortunately, most boards are smooth on one side and rough on the other.

Grade: Tom pays extra for clear (knot-free), vertical-grain (quartersawn) siding because it's easier to paint and is more stable than cheaper, flat-sawn boards. It's also easier to maintain because paint sticks to it longer, and the end joints remain sealed. But if C-VG doesn't match the rest of the siding, then go with a grade that does.

The Nail You Need

While there are many varieties of clapboard to choose from, only one kind of nail will do: a stainless steel ring-shank nail for siding. Stainless steel doesn't rust or stain the paint or leave black streaks on the wood, and the rings on the shank act like barbs, gripping the sides of the hole to prevent the nail from popping out.

For the best guarantee against pop-out, use 7d or 8d (2¼ or 2½ inches long) nails and drive them into the studs. You can get away with hammering 5d (1¾-inch) nails just into the sheathing as long as it's -inch (or thicker) and made of plywood, OSB, or solid wood. To find out how thick your sheathing is, remove a piece of siding and poke a drill bit into a vertical seam between two sheathing pieces. Because these seams always land at a stud, measuring how far the bit goes in will tell you the sheathing's thickness.
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    Tools List

    • utility knife
      Utility knife
    • flat prybar
      Pry bar
    • hammer
    • hacksaw blade
      Hacksaw blade
    • hand saw
    • caulk gun
      Caulk gun

    Shopping List

    1. Replacement Clapboard (see Overview)

    2. Acrylic Latex Caulk

    3. 7d Stainless Steel Ring-Shank Siding Nails