Grade rods, also known as leveling rods or surveying rods, are long measuring tools that are used in construction and surveying to determine height and elevation differences between different points. Grade rods typically consist of a long, straight, and rectangular bar made from materials such as aluminum or fiberglass. They are marked with graduations and numbers along their length, allowing them to be used to measure elevations and heights. Grade rods may also have specialized features such as a telescoping design or a built-in leveling bubble to help ensure accurate readings.
Grade rods are commonly used in conjunction with a leveling instrument, such as a laser level or a dumpy level, to determine height and elevation differences between different points on a construction site or survey area. They are an essential tool for ensuring that buildings and other structures are constructed level and plumb, and that roadways and other infrastructure projects are built to the proper grade and slope.
Grade rods or leveling rods come in different specifications and designs, depending on their intended use and the type of construction or surveying project. Here are some common specifications and features of grade rods:
Material: Grade rods are commonly made from aluminum, fiberglass, or wood. Aluminum and fiberglass rods are more durable and weather-resistant, while wood rods are more affordable but may warp or crack over time.
Length: Grade rods come in different lengths, ranging from 8 feet to 25 feet or longer. The length of the rod should be appropriate for the height of the structure or area being measured.
Graduations: Grade rods are marked with graduations and numbers along their length to indicate height or elevation differences. Common graduations include feet, inches, and tenths or hundredths of a foot.
Sections: Some grade rods are designed to be telescoping or adjustable, with multiple sections that can be extended or collapsed to different lengths. This allows for greater flexibility and precision in measuring different heights and elevations.
Leveling bubble: Some grade rods come with a built-in leveling bubble to help ensure that the rod is held level and plumb while taking measurements.
Carrying case: Many grade rods come with a carrying case or bag for easy transport and storage.
When choosing a grade rod, it's important to consider the specific needs of your project and select a rod that is appropriate for the job at hand.