Follow these steps:
* Note: You may leave an expansion joint without seam filler when SurePly® plywood underlayment is used under carpet, engineered floors, or wood floors.
In our 50 plus years of experience, the majority of underlayment flooring failures are due to telegraphing seams and fastener blow-through. Telegraphing seams and fastener blow-through are always the result of incorrect installation. They are not caused by panel failure. There are many factors that can cause telegraphing seams. These are the most common:
Fastener blow-through is caused by not properly adjusting the drive depth or air pressure in your staple or nail gun, which can result in shooting the fastener completely through the underlayment. Nothing short of physical plywood failure such as delamination will be warranted with regard to telegraphing seams.
Before moving or positioning any heavy object across the floor (such as a large appliance), place a minimum of 1/4" plywood on top of the completed floor to prevent point overloading.