4 edition of Air drying of lumber found in the catalog.
Air drying of lumber
by U.S. Dept. of Agriculture, Forest Service, Forest Products Laboratory in Madison, WI (One Gifford Pinchot Dr., Madison 53705-2398)
Written in English
|Statement||USDA Forest Service, Forest Products Laboratory|
|Series||General technical report FPL -- GTR-117, General technical report FPL -- 117|
|Contributions||Forest Products Laboratory (U.S.)|
|The Physical Object|
|Number of Pages||62|
Air-drying timber stack Wood drying (also seasoning lumber or wood seasoning) reduces the moisture content of wood before its use. When the drying is done in a kiln, the product is known as kiln-dried timber or lumber, whereas air drying is the more traditional method. There . If this wood is totally green, you will tear it apart by drying it too aggressively at the very beginning. Kiln operators air dry their wood outdoors to at least 20% before artificially drying the wood further. board feet of totally green lumber could very .
The process of Air drying can take anywhere from 2 weeks to many months depending on lumber thickness and species. Why so long? The cost of kiln drying is very expensive, so lumber manufacturers use the natural sunlight and wind to start the drying process. This manual is a revision of the edition of Air Drying of Lumber: A Guide to Industry Practice by Raymond C. Rietz and Rufus H. Page. A major contributor to the edition was Edward C. Peck, formerly a wood drying specialist at the Forest Products Laboratory. The major reason for this revison is the continued interest in.
Drying Hardwood Lumber ( MB) All Related Articles Air Drying Lumber Kiln Construction Kiln Operation Lumber Sales and Special Offers Industry News Woodworkers Directory Sawing and Drying Directory The Wood Doctor Bookstore Lumber Buying Guide Tradeshow Directory Newsstand Lumber/Timber/Misc Calculators Events Calendar Media Kit Poll. There are three fundamental factors that influence the drying of lumber: 1. Heat – An increase in temperature will increase the evaporation rate and therefore reduce the drying time 2. Humidity - A decrease in Relative Humidity (RH) in air will decrease the drying time 3. Air circulation – An increase in airspeed will increase the evaporationFile Size: 2MB.
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Particular emphasis is placed on the yarding of lumber in unit packages. Included are such subjects as why lumber is dried, advantages and limitations of the process, properties of wood in relation to drying, the drying yard layout, piling methods, causes and remedies of air-drying defects, factors affecting the cost of air drying, and Cited by: This report describes how lumber can be air-dried most effectively under outdoor conditions and illustrates the principles and procedures of air-drying lumber that were developed through field investigations and observations of industrial practices.
Particular emphasis is placed on the yarding of lumber in unit packages. Air-drying means stacking lumber and exposing it to the outdoors. Air-Drying Lumber It’s the low-cost, low-tech way to dry lumber. Here’s how to do it right.
Put Your Pile in the Open. Locate the stack in an open area exposed to the prevailing winds. Prepare a Good Foundation. For outdoor drying, the foundation should Author: American Woodworker Editors. Steps for Air Drying Lumber Saves money.
Closer to the source. Carve a little something. Store vertically first. Scrape the sawdust. Dehumidify. Check moisture level periodically. Set the foundation. Stack it.
Weight on top. Fan. Check moisture periodically. McMillen and Wengert () tabulated air drying times to 20% moisture content for most nominal 1- and 2-in.- thick lumber of hardwood species dried in the U.S. South, mid-South, Central, and mid-North. These estimates are given in terms of ranges that depend on the time of the year the lumber is Size: 1MB.
Air Drying Lumber Depending on the thickness of the lumber and where you live, weather and time of the year, it will take anywhere from 6 weeks to 4 months. Most lumber is in the 1” to 2” thickness and the time above applies to thicknesses. According to the U.S. Forest Service's Forest Products Laboratory in Madison, Wisconsin, it takes 1"-thick green boards from days to air dry to percent moisture content in sunny, temperate, not-too-humid weather.
Drying Hardwood Lumber is an update of a previous Forest Service publication, Drying Eastern Hardwood Lumber by John M. McMillen and Eugene M. Wengert. Both publications contain information published by many public laboratories, universities, and associations, as well as File Size: 1MB.
Drying times and kilns. The traditional rule-of-thumb for air-drying lumber is to allow one year of drying time per inch of wood thickness; this adage obviously only takes a few of the aforementioned variables into account, but it’s at least a rough starting point in understanding the time investment required in order to properly air-dry lumber.
The most common method used to air-dry lumber is to lay narrow sticks perpendicular to the layers of lumber to create an air space between each layer so the moisture can escape.
A good foundation is critical to successfully drying wood. I needed to set up the foundation for the slabs that will be sawn from the silver maple log that I picked up in my urban logging video and I've received many questions on drying outdoors and. Air-Drying Wood Tip #1 – Stack with Spacers and a Light Breeze As wood comes off the sawmill it’s wettest of all, with a moisture content that can be higher than 30%.
It’s like a slice of celery. If you drive a nail into it, water will appear. Much general information needed for air drying and kiln drying hardwoods properly is contained in two Agriculture Handbooks: The “Dry Kiln Operator’s Manual”1 and “Air Dry- ing of Lumber.”2 This report does not attempt to repeat all details from those vol- Size: 1MB.
"This book describes the fundamental basis of kiln-drying technology, enabling forest companies to improve their drying operations as high-quality timbers become scarcer and former wasteful practices can no longer be tolerated.
It covers wood structure, moisture in wood, moisture movement and stress development on kiln-seasoning lumber boards. Air drying is a lengthy process usually each board takes 1 inch (25mm) per one year to dry, the lumber is stacked off the ground inch(mm) on stickers which are placed across the boards and inline to each below, and above in between the boards to avoid sagging to gain even weight distribution.
The air dehumidification kiln reaches a temperature of 95 to oF, and the hot air is circulated over the wood. The hot, moist air is then cooled by passing over cold refrigeration coils.
The evaporated moisture condenses into liquid form and is drained as cool water. Figure 2 illustrates the working principles of the dehumidification kiln.
To prevent discoloration, stacks of lumber for air drying must be placed on a solid foundation that provides ample space between the soil and the bottom layer of the boards (Figure 1).
At least 12 inches of air space beneath the drying lumber must be maintained free of vegetation and surface water. Air-drying and solar kiln drying are the most economical ways to remove much of the water from green lumber. Correct exposure of lumber to the outside air can reduce moisture content to 14–19 percent; lumber at this moisture content is suitable for many construction uses and exterior applications.
air dried wood will usually gets down to a moisture content of 12% or a little less kiln dried around 8% use that moisture meter i use mine alot when buying wood to wet or to dry can cause warping problems when submitted to changes in temp and humidity.
Air drying lumber is the classic method to drying wood and has been around for ages. This process requires the wood to be stacked in layers on a raised foundation in a cool, dry area and separated with stickers (aka thin wood shims).Simply put, you need to build a stack that allows air to circulate around each board, keep the stack off the ground to avoid moisture from ruining the wood and keep the sun and rain off the lumber.
While the ideal place for air drying lumber is in a shelter such as an open shed, you can stack it anywhere it is protected from direct sun.Additional Physical Format: Online version: Rietz, Raymond Carl, Air drying lumber in a forklift yard.
Madison, Wis.: U.S. Dept. of Agriculture, Forest Service.