Wood Drying

If you’ve ever purchased lumber and looked at the item descriptions, you’ll notice it either says green or kiln dried. Kiln dried wood gives you the kind of fire you’ve always dreamed of – fast, hot and beautiful. Kiln (fast kiln) — Very dry and stable, good for building projects, harder on lathe chisels, and requires more sharpening. When installing a deck, it’s important to know the moisture content of the wood in order to determine how much gap the floor requires for expansion. Green lumber is usually less expensive than kiln-dried lumber and can be used where movement will not weaken a structure or wreak havoc on a design detail. The rings are widely spaced leaving the lumber with fewer growth rings per board.

When you consider that firewood that has moisture in it uses most of its energy to dry the water that is remaining in the wood and this reduces the amount of heat. Our Kiln Dried Firewood logs are dried to less than 20% moisture content to ensure a high heat output. As the world awakens to its own nature, wood moisture meter technology has advanced greatly. Too much moisture, and wood used for decking or other outdoor installations can warp, shrink, or crack when exposed to humidity. The forces between dry wood and water are so great that it is impossible to prevent the gain of moisture. We air dry for about one month, then rack the wood in the kiln and use a dehumidifier and small fan.

The drying conditions are successively varied from time to time in such a way that the kilns provide control over the entire charge of timber being dried. It is reported that the ratio of the longitudinal to the transverse (radial and tangential) diffusion rates for wood ranges from about 100 at a moisture content of 5%, to 2 – 4 at a moisture content of 25% (Langrish and Walker, 1993). The drying of wood is thus an area for research and development, which concern many researchers and timber companies around the world. Baffles are used to force the air through the lumber packages across the surface of the boards.

While kiln-dried wood is useful for some applications in the landscape, pressure-treated wood is more commonly used where exposure to moisture or soil are likely. Once the EMC is achieved, a wood’s MC can vary with slight changes in the RH of the surrounding environment without jeopardizing the strength and structural integrity of the end wood product.

If you have been burning seasoned or semi-seasoned firewood then kiln dried logs are going to be a real treat for you! Burning kiln dried firewood is better for the environment, you don’t need to burn as much for a start cutting down on labour, transport and storage. When lumber is first harvested and cut, it is known as green” because it has not been dried or treated. Vacuum – Type of kiln where lumber is dried at less than atmospheric pressure either continuously or intermittently during the drying cycle. Dense woods, which are difficult to dry because of excessive shrinkage, can also be successfully dried in a vacuum system.

The problem is that a firebox load of very dry wood produces far more smoke than the air supplies of stoves are designed to provide. A dry piece of wood will exchange water molecules with the surrounding air according to the level of atmospheric relative humidity. We deliver to restaurants that need firewood for wood-fired ovens and a variety of other businesses that need a regular supply of good quality wood-fuel.what is kiln dried wood

This 1.25m of kiln dried un-split firewood is produced to the same high standards you would find in Scandinavia or Germany, two climates which are known for their harsh winter weather. Kilns are an integral part of the wood’s MC measurement and management process, as the kiln-drying procedure is where the green lumber is dried to its optimum EMC. Heated air is circulated over the wood, and the water on the wood surface evaporates, raising the humidity of the air.

If the wood feels damp, then I consider it too wet to coat, but it really depends on what you are coating it with. SSV run at partial atmospheres (typically around 1/3 of full atmospheric pressure) in a hybrid of vacuum and conventional kiln technology (SSV kilns are significantly more popular in Europe where the locally harvested wood is easier to dry versus species found in North America). Some people firmly believe that there are appreciable differences between air dried and kiln dried lumber, preferring one style over another. The whole process of wood drying, no matter how you go about it, seems to be a very time consuming process.

The fire will burn cleaner and hotter with kiln dried logs and the stove window is unlikely to soot up. When burning on an open fire there is much less spitting and sizzling making it much safer for you and better for your chimney. End checks, warp, split and other drying defects such as moisture content variation are all common defects that will lead to reduced efficiencies that affect other parts of the production process. Equilibration (usually drying) causes unequal shrinkage in the wood, and can cause damage to the wood if equilibration occurs too rapidly.

More lumber in both primary and secondary manufacturing is now being custom dried for specific value-added end products. Buying firewood supports local jobs and communities in the North of England – rather than economies of oil producing countries. The modules blend the teaching of solid scientific principles with a practical solutions-based approach. The nets are very convenient for our customers with limited storage space for firewood.

This is an essential part of the drying process as it relieves stresses in the wood that develop during the day as the wood dried. Each log has been kiln dried to less than 20% moisture content, making it perfect for producing a hot fire that will heat your home. Loss or gain of moisture in wood products may cause such troublesome results as shrinking or swelling, interference with paint adhesion, and increased susceptibility to decay and stain. For example, stoves with a glass door which will get stained by the normal green wood due to the moisture. Logs are cut to 25cm in length and kiln dried to an average 20% moisture content.

Many thermometers (both traditional and digital) sold by big-box retailers also feature a hygrometer with a somewhat accurate readout of the relative humidity; the ability to know the rh of both the drying cabinet and the wood shop proves to be a helpful and prudent investment. To minimize the changes in wood moisture content or the movement of wooden objects in service, wood is usually dried to a moisture content that is close to the average EMC conditions to which it will be exposed.

Kiln dried wood in the UK is sourced from local sources where the woodland is properly managed to be sustainable. The significant advantages of conventional kiln drying include higher throughput and better control of the final moisture content. Wholesale Firewood If you are looking for a quality wholesale company for Kiln Dried Ash then please contact us today and find out more about our quality Kiln Dried Firewood logs. Since we are careful and consistent in the drying process, we avoid case hardening. Our logs are 100% natural and the wood is sourced from sustainable, managed woodlands.

Kiln drying wood at elevated temperatures also has many other secondary effects as well, such as killing powderpost beetles (a destructive wood pest) in all stages of their development. A higher number of layers glued together, flush and true construction and interlocking joints make for a very sturdy frame. Ideally, wood is dried to that equilibrium moisture content as will later (in service) be attained by the wood. Depending on outside conditions and lumber species and size, air drying may take up to a year or more to obtain these moisture contents.

Fiber saturation point (FSP) – The stage in the drying or wetting of wood where the cell walls are saturated with (bound) water and the cell cavities are free of (liquid) water. Wagner Meters, a family-run industry leader in MC measurement technology, has developed several wood moisture meter products to assist industry specialists , retailers, wood flooring installers and owners and hobbyists in protecting their investments. The process of condensing water vapor into liquid allows the recovery of the energy required to evaporate the water from the wood in the first place.

The price of kiln dried hardwood logs is higher because they have had to go through a process of kiln drying but it doesn’t mean that they are more expensive. If you have been burning seasoned or semi-seasoned firewood then kiln dried logs are going to be a real treat for you. Benefits- It can be less expensive to use this drying method (there are still costs associated with storing the wood, and with the slower process of getting the wood to market), and air drying often produces a higher quality, more easily workable wood than with kiln drying.

Laminates do not require drying, since they are made up of a composite of wood fibers and a binding agent. Kiln dried logs are dried to an average moisture content of 20% and are recommended for immediate burning on all wood burning appliances. Timber is the name given to wood that has been prepared for the purpose of building or carpentry. Dry firewood is much easier on the stove or fireplace, and it does not leave nearly as many pollutants or deposits.

When the relative humidity (RH) in the air rises, wood absorbs moisture from the air; when the RH falls, wood releases moisture into the air. Inches are designed by a double I’m guessing you mean you have a board that is 50 inches long, and not 50 feet long. In the process, deliberate control of temperature, relative humidity and air circulation is provided to give conditions at various stages (moisture contents or times) of drying the timber to achieve effective drying. The drying rate is carefully monitored to prevent an imbalance that can cause cracking.

Solar drying may be an inexpensive viable option for these countries to dry their woods before exporting them, and thus, add value to their economies. If the wet” lumber weighs 4,700 pounds per thousand board feet (lb/mbf), and the dry lumber weighs 2,300 lb/mbf, then the water removed weighs 2,400 lb for every mbf of lumber. Interior and exterior finishes can be applied immediately to the kiln-dried logs following construction, speeding up the construction schedule and providing immediate protection from the elements.

Most kiln dried logs (such as ones bought in the supermarket or at stores like BNQ etc) fall between 3,600-4,500 kWh/tonne, a significant increase of heat output at almost twice that of most seasoned logs. Forced circulation kilns are most common, where the air is circulated by means of fans or blowers, which may be installed outside the kiln chamber (external fan kiln) or inside it (internal fan kiln).