(20% moisture content per weight unit)
In green softwoods the moisture content of sapwood is usually greater than that of heartwood. In green hardwoods the difference in moisture content between heartwood and sapwood depends on the species. Variability of green moisture content exists even within individual boards cut from the same tree.
When wood is alive and fresh it consists primarily of water, i.e. most of the weight is actually water. Green wood is freshly sawn wood in which the cell walls are completely saturated with water. Additional water may reside in the lumina. The moisture content of green wood can range from less than 30% to more than 200% of dry wood weight.
- in Fahrenheit
- in Celsius
At a given location the typical summer condition inside a house is 25 oC temperature with 65% relative humidity. The typical winter condition in the same house is 18 oC temperature with 15% relative humidity.
From the chart above we can estimate the moisture content in the wood in the house at summer time to be 12%. The moisture content at winter time can be estimated to be 3-4%.
Wood changes dimensions with moisture - it swells when it gains moisture - and it shrinks when it loses moisture.
Typical wood shrinkage from green to ovendry moisture content is typical 3-8% in radial grain direction and 6-12% in tangential grain direction. Volumetric shrinkage is typical 11-18%. Longitudinal shrinkage parallel to the grain is generally quite small. Typical values from green to ovendry wood are 0.1-0.2%.
Boiler house topics, fuels like oil, gas, coal, wood - chimneys, safety valves, tanks - combustion efficiency.
Densities of solids, liquids and gases. Definitions and convertion calculators.
Material properties of gases, fluids and solids - densities, specific heats, viscosities and more.
The drying force of air depends on the air moisture holding capacity and the water surface to air evaporation capacity.
Maximum water content in humid air vs. temperature.
Calculate angles with a straight board across carpenter's square.
Board feet is used as a volume measurement of lumber.
The cord unit for purchasing fuel wood.
Common sizing of glue-laminated timber.
Species of hardwood vs. softwood.
Sizing of hardwood lumber.
Lumber and surface finishing abbreviations.
Calculate miter saw protractor angles for skirting and decorative mouldings work.
Calculate the moisture content in products like wood on wet and dry basis.
US common wire standard nail and spikes sizes and dimensions - Imperial Units.
Allowable withdrawal load for nail and spikes.
Grit sizes ranging 12 - 600.
Rough lumber, surfaced lumber (dressed), worked lumber, shop and factory lumber and yard lumber.
Nominal and minimum-dressed lumber sizes.
Trees species and relative water demand.
Height of trees commonly used in towns and urban areas.
Combustion of wood and firewood heat values for species like Pine, Elm, Hickory and more.
Red Spruce, Longleaf Pine and Douglas Fir - moisture content and their compressive strength.
The density of wood versus moisture content.
Weight supported by a double or triple wood headers.
Allowable withdrawal load force.
Densities of various wood species - apple, ash, cedar, elm and more.
Density, fibre stress, compressive strength and modulus of elasticity of clear wood, panel and structural timber products.
Add standard and customized parametric components - like flange beams, lumbers, piping, stairs and more - to your Sketchup model with the Engineering ToolBox - SketchUp Extension - enabled for use with the amazing, fun and free SketchUp Make and SketchUp Pro . Add the Engineering ToolBox extension to your SketchUp from the Sketchup Extension Warehouse!
We don't collect information from our users. Only emails and answers are saved in our archive. Cookies are only used in the browser to improve user experience.
Some of our calculators and applications let you save application data to your local computer. These applications will - due to browser restrictions - send data between your browser and our server. We don't save this data.