Some standard textbooks define weight as a vector quantity, the gravitational force acting on the object. Others define weight as a scalar quantity, the magnitude of the gravitational force. Yet others define it as the magnitude of the reaction force exerted on a body by mechanisms that counteract the effects of gravity: the weight is the quantity that is measured by, for example, a spring scale.
Thus, in a state of free fall, the weight would be zero. In this sense of weight, terrestrial objects can be weightless: ignoring air resistance, the famous apple falling from the tree, on its way to meet the ground near Isaac Newton, would be weightless.
The unit of measurement for weight is that of force, which in the International System of Units (SI) is the newton. For example, an object with a mass of one kilogram has a weight of about 9.8 newtons on the surface of the Earth, and about one-sixth as much on the Moon. Although weight and mass are scientifically distinct quantities, the terms are often confused with each other in everyday use (i.e. comparing and converting force weight in pounds to mass in kilograms and vice versa).
Further complications in elucidating the various concepts of weight have to do with the theory of relativity according to which gravity is modeled as a consequence of the curvature of spacetime. In the teaching community, a considerable debate has existed for over half a century on how to define weight for their students. The current situation is that a multiple set of concepts co-exist and find use in their various contexts.
Lumber – Weights
Weights of green, kiln dried and pressure treated lumber boards.
The density and weight of lumber varies with the water or moisture content in the wood. Typical weights for green, kiln dried and pressure treated lumber boards are indicated in the tables below.
Note that nominal dimensions are not the same as actual lumber dimensions.
Green Lumber Boards
- Inches to mm lumber dimensions
- Weight vs mass – the difference
Drying lumber takes time. Smaller and shorter boards use considerable less time than larger and longer boards. For larger pieces natural drying takes months and often even more than a year – depending on the surrounding temperature, moisture and air circulation. Smaller shorter pieces can dry in weeks.
Moisture content in wood
The weight of pressure-treated lumber varies depending on the size of the boards. A 2-by-4-inch lumber board that is 8 feet long has a weight of 17 pounds. A 4-by-12-inch board that is 16 feet long weighs 224 pounds.
People also ask, how much does a treated 2x6x8 weigh?
Furthermore, how much does a pressure treated 4x6x12 weigh?
How much does a 8 foot 2×6 weigh?
How much does a 1/2 sheet of plywood weigh?
Calculate the Weight of Wood
Calculate the weight of kiln dried pine, green oak, and pressure treated wood with this free and easy online tool.
Use the drop downs to select a size for the lumber. The list contains the most popular sizes for wood. If it is not on the list, then it may be necessary to use another size and adjust it accordingly. For example, 4 x 6 lumber is not on the list, but you can simply choose 2 x 6 and double the value.
Next select a length in feet and inches. Finally select a type. The choices on the list are kiln dried pine, green oak, pressure treated above ground, and pressure treated below ground. The weight of the lumber is automatically returned in pounds.
Variations in the Weight of Wood
The weight of pine, green oak, and pressure treated can vary greatly from board to board. This calculator assumes that it has a fairly high moisture content. Exposure to excessive moisture for tree sawn and engineered lumber will also temporarily increase the density (water log).
The beam in this photo is an examples of the type of lumber this calculator considers. It is a 2 ply 12″ laminated. It will weigh approximately 170 pounds.
How Much Does Pressure-Treated Lumber Weigh?
The weight of pressure-treated lumber depends on how much time has gone by since the wood was treated, as well as the size of the board or post.
Most pressure-treated lumber is made from southern yellow pine, which is a relatively heavy wood to begin with, so pressure-treated wood does tend to be heavier than most other lumber because of this alone.
But the weight that people really notice when it comes to treated lumber is the water weight that the wood picks up while being treated.
A 10-foot-long 2×6 pressure treated lumber board weighs around 40 pounds right after being treated. The same board only weighs around 23 pounds after it has had time to dry out.
About these Weight Values
The following table provides the heaviest approximate weight (dead load, self-weight) per linear foot of pressure-treated lumber.
The weight values we provide are for the wood immediately after being treated, for the wood after it has dried thoroughly, and for untreated wood with the same dimensions.
This table is intended to give you an idea as to what pressure-treated wood might weigh at its heaviest.
The values given are for the heaviest wood species, longleaf pine (southern yellow pine, longleaf), commonly used to produce pressure-treated lumber.
The “freshly treated” column in the chart shows the weight for the wood when it contains the highest amount of water commonly added to the wood during treatment (close to four gallons, or about 32 lbs., per cubic foot).
How much weight can a 4x4x8 hold vertically?
Your average yellow pine 4x4x8 will be able to hold up to two tons (4,000 lbs), with the correct vertical support beneath it. These numbers are based on your average yellow pine 4×4, at 8 feet in length. The number may vary, depending on the grade of the wood, and the condition.
How much does a 6×6 post weigh?
Table of Pressure-Treated Lumber Weights
How much weight can 4 6×6 posts hold?
The load capacity of a 3-foot #2 grade 4×4 is 17,426 pounds, and a similar 6×6 is 20,834 pounds or 16% better. However, an 8-foot 4×4 supports 6468-pounds and 2339-pounds at 14-feet, while a 6×6 is 18032 and 10550-pounds respectively – or 64% and 78% more load capacity.
Can a 6×6 be used as a beam?
2 Answers. No. 6-by lumber hasn’t been used for beams since the 60s or so (and it doesn’t fit in your wall anyway). An engineer would specify something between a doubled 2×10 and a doubled 1-3/4″ LVL (engineered lumber) beam, up to 12″ nominal height, depending on the roof system.
How much weight can a 8×8 post support vertically?
how much does a 4x4x8 weigh
That being said, a post can hold a tremendous amount of load! If a particular species of wood can support 1,000 psi, then an 8×8 post can hold 64,000 pounds! The limiting factor (reason to up-size) will likely be aesthetics and/or the number or type of joints needed.
The lumber weight and volume calculator below will estimate the weight, board feet, volume (cft), specific gravity, and density of any species of wood.
Check out the plywood weight calculator to estimate plywood weights.
How To Use This Calculator
First, select whether you want to calculate lumber weight, volume, or both.
If you chose to select lumber weight, select whether or not you have treated wood. Treated wood has chemicals (usually MCA or micronized copper azole) in it that will slightly increase the weight.
Standard treated wood has about 0.06 lbs/cubic foot chemical retention while wood treated for ground contact has about 0.15 lbs/cubic foot.
Next, select your species of wood.
How to Estimate How Much Wood Weighs
The weight of wood varies by the species of wood and the moisture content of the lumber. Green lumber will weigh significantly more than kiln dried boards due to its higher density.
Find Wood Density
To find how much wood weighs start by finding the density of the wood. Use the wood density chart below to find the density for different species of wood.
Find Wood Volume
Once you have the density of the wood you need to find the volume of the wood in cubic feet or cubic meters. If you know the board footage of the lumber, divide it by 12 to find the volume in cubic feet. Our board footage calculator can help find the volume of your wood in board feet.
Thank you for staying with this post “how much does a 4x4x8 weigh” until the end.
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