Every load of tongue-and-groove siding contains some crowned pieces. If you run into this problem, there is no need to save them for the back of the house where the resulting gaps will be less conspicuous. Instead, persuade them with a pressure block.
As shown in the drawing, a pressure block in this case is a short piece of tongue-and-groove siding toenailed into the stud above the gap in the siding. We use a 16d nail for this purpose. As the nail is driven downward, the pressure block follows suit, straightening out the bow in the siding and closing the gap. With the gap closed, we drive a couple of nails into the siding below the block to secure it to the stud. Then we knock out the pressure block and drive home the siding nails.
Ryan Hawks, San Diego, CA
