Had Shaw engineered hardwoods installed in May 2015 -- during the rain bonanza we experienced. Floor was installed on day of delivery. Current inspection states "peaking" is the problem. Rubber mallets were used in the installation. Mfg is denying defect and pointing to installation: no acclimation, no moisture testing prior to install, rubber mallets used and areas where there is less than 6" space between end joints; 100 lb roller not used to set adhesive. What does this mean? "Zero vertical expansion results in pushing the floors to the center, which facilitates peaking." Is everyone using a moisture meter prior to starting install? Is everyone rolling flooring to set adhesive? Thanks!!