The reason siding becomes warped is because the ends of the wood boards were placed too close to each other when they were installed. Moisture causes wood to expand. When the ends of the boards expand against each other, they warp. You might be able to repair some minor warping with nails and screws, but this does not really address the problem. The best long-term solution is to shorten the boards so they have room to expand.
Things You'll Need
- Wood block
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Pry the nails from the warped area of the board with the back end of a hammer. Pull out enough nails so the end of the board can be pulled away from the house.
Pry the end of the board with a chisel or other tool from the side of the building. Wedge a wooden block in place to secure the board away from the wall, taking care not to damage any material that was underneath the plank.
Inspect the area behind the boards. If the crevasses are filled with silt, you must remove the siding and clean it. Silt that is not removed from behind the siding will trap moisture and cause more problems.
Shorten the end of the board with a saw, rasp or plane. Remove enough of the board so it's 1/16 of an inch away from the next board.
Remove the wedge from underneath the board. Push the board back into place and secure it with nails.