To Determine the Foundation Grade of your House, you have to take the level, piece of plywood and ruler outside. You need to clear away landscaping items so that you can access the closest point of the house exterior. After that, lay the 2-foot long piece of plywood on the ground so that it is flat. Then, Place the level on top of the plywood and horizontally. You should provide the level a few seconds to even out and find the accurate slope.
You must Read the level with looking for the bubble in the liquid. Next, lift up the appropriate side of the level to make the bubble move more toward the center. You must Notice the distance off the plywood that you have to move the side of the level in order to make the level straight and even. You can Use your free hand to place a ruler vertically on the plywood and measure the distance between the plywood as well as the level in centimeters or inches. Forth, Remove the plywood and place it further away from the house on the ground.
You have to repeat the process of leveling and measuring the distance.