I have a sawmill and a solar kiln, and cut mostly red and white oak. The lumber is end-coated, and stickered in piles 8 feet high and kept inside a building for up to a year before being put in the solar kiln. I have started using 4-foot x 9-foot x 7-inch slabs of cement (3000lb) on the top of my piles to help stop the cupping and bowing.
My question: At what moisture content (MC) does the cupping and bowing cease? If I put the wood in the solar kiln at 12 to 20 percent, is the weight still needed?