Abiotic forces of nature like sun, fire, water etc. Wood is further processed and transformed into timber, lumber etc. Air seasoning air seasoning advantages advantages of air seasoning no expensive equipment needed small labour cost once stack is made environmental friendlyuses little energy air seasoning disadvantages disadvantage of air seasoning it takes much longer than kiln seasoning large area of space reqired for a lot of wood it is notable to. Seasoning is the process of removing the moisture content from wood to minimize structural problems when used in construction or to provide less. Aug 31, 2017 wood are classified into two main groups softwoods and hardwoods. Apr 03, 2019 natural air seasoning artificial kiln seasoning 3. Timber is seasoned to dry out the timber to bring it to a usable and workable condition. This is a process of natural seasoning of timber that gives good results with logs of freshly cut trees. Timber also benefits from its natural growth characteristics. Seasoning is the reduction of moisture content of timber to that of thesurrounding air sydney area approx.
Wood that is dried below 20 percent moisture content is not susceptible. Timber can be used for so many purposes, but has some advantages and disadvantages. Often air seasoning and kiln seasoning are used together. It is a process by which the amount of moisture in. Natural seasoning gives good results but takes more time. Seasoning of timber is the process by which moisture content in the timber is reduced to required level. Hardwood comes from angiosperm trees, which have elements that distribute water and nutrients throughout the wood. When the drying is done in a kiln, the product is known as kilndried timber or lumber, whereas air drying is the more traditional method. There are multiple advantages to having wood artificially seasoned that relate to the quality, strength and cost of the wood. Kilns are used because the process speeds up seasoning and this method can be used to accurately control the. State two advantages and two disadvantages of air natural seasoning. Artificial seasoning of timber assignment help, artificial seasoning of timber homework help, civil engineering tutors.
Seasoning can be achieved in a number of ways, but all methods aim to remove water at a uniform rate to prevent damage to the wood during drying seasoning degrade. Inexpensive, easily managed, no specialist labour required, no expensive equipment needed. By reducing the moisture content, strength, elasticity, and durability properties are developed. Though a traditional and sometimes sustainable material that is often used in a wide variety of applications, wood has many disadvantages that can be mitigated by the selection of other materials. Methods of natural air seasoning of wood timber how to do. Benefits of kiln seasoning for your life and environment. For joiners work it requires four years, unless other methods be used. The wood spice process is the process by which the moisture in the wood is reduced to the required level.
In this method, the timber is immersed in boiling water or exposed to the action of steam. Artificial seasoning is the process by which lumber is dried using manmade devices such as a kiln. So, artificial seasoning of timber is developed nowadays. What is seasoning of timber type of seasoning of timber. Types of defects in timber as a construction material.
Seasoning a level theory a2 dt what are the advantages to this method. Sawn timber is stacked in a dry place about 30cm above floor level with longitudinal and cross pieces arranged one upon another, leaving space for the free circulation of air. These defects in timber can be due to natural forces, fungi, insects and during seasoning and conversion. Timber seasoning and laminationthere are two ways that timber may be seasoned. However some defects can be beneficial for a specific type of work, for example, twisted wood is good for making a bowl out of timber. Slow, no control over final mc, mc of only 18% achievable, weather dependent, boards prone to fungusinsect attack. Natural seasoning of timber natural seasoning is the process in which timber is seasoned by subjecting it to the natural elements such as air or water.
Give two advantages that air dried timber seasoning has over kiln dried timber seasoning. When the drying is done in a kiln, the product is known as kilndried timber or lumber, whereas air drying is the more traditional method there are two main reasons for drying wood. Timber is a cost efficient building material which has many great characteristics for outdoor structures and products. Trees gives us the timber which is converted into required form and finally used. Felling, preparation of natural wood and seasoning. As compared to the artificial seasoning method, this method is timeconsuming. What are the disadvantages of natural seasoning of timber. Standing timber with poor form is often overlooked at harvest time, and any timber stand is less than fully exploitable. There are various types of defects in timber as a construction material. Instead of boiling water hot steam can be circulated on timber. Methods of natural air seasoning of wood timber how to. These can be conveniently discussed under two headings.
Reduces weight of wood thus reducing handling cost 6. The links below will take you to information and worksheets, on the worlds forests natural. Seasoning of timber from day to day, most people have some contact with seasoned timber. The different ways that seasoning in wood can be achieved. The advantages of timber frame building timber frame building is a versatile, timetested method of natural building that allows you to create beautiful, sturdy buildings. The process of removing excess moisture from wood by drying it after conversion is termed as timber seasoning. This could take a lot more time and delay the sale or productive use of your wood. Advantages and disadvantages of air seasoning of timber compared to drying. The blocks stop the timber absorbing water from the ground the timber is covered by an over hanging roof. Woodworking when wood is used as a construction material, whether as a structural support in a building. There are many disadvantages of timber when used for building.
At present timber can be seasoned by a number of methods. Natural seasoning this method is also called air seasoning timber seasoned by this method is left outside to dry for many months the timber is stacked on large planks of timber, these planks are stacked on blocks. The seasoning time for wood can be reduced considerably through the use of a specialist kiln. By artificial seasoning, timber is seasoned with in 45 days. Slow, no control over final mc, mc of only 18% achievable, weather dependent, boards. The blocks stop the timber absorbing water from the ground the timber.
At the opposite of brick or concrete walls, timber walls dont need to be very thick. Microwave seasoning microwave energy is directed at the timber, driving out the excess moisture. Wood can be fabricated into all kinds of shapes and sizes to fit practically any construction need. Oct 22, 2017 advantages, wood, wood seasoning, shallow there are many reasons for drying wood, improving of properties of wood to be used for construction is the main aim. Uncontrolled conditions so no way of establishing the water content of the timber and thus there is less consistency, can take up to five years to fully season. The timber that comes from the coniferous tree is known as softwood and the timber that comes from the deciduous tree is known as hardwood. As shown above, at recommended wood moisture contents and only when the species being dried can tolerate an increase in the rate of drying the conditions within the kiln are changed harshened so that the moisture content of the timber continues to fall at an. Timber is vulnerable to biotic forces like termites, woodworm or wood ants. Seasoning of timber methods of timber seasoning ravi dhami. Felling, conversion and seasoning of wood engineers.
Kiln seasoning is an important type of artificial seasoning in which the timber is seasoned by the use of a forced draught of warm air in which brings about a rapid reduction in moisture content. Wood shrinks across the grain not along the grain when it dries. Wood has a natural ability to absorb water which is also known as. Advantages of timber timber is a versatile material. The traditional method of seasoning timber was to stack it in air and let the heat of the atmosphere and the natural air movement around the stacked timber remove the moisture.
Mar 27, 2018 disadvantages of timber in construction. In place of sap, the cells get filled with ordinary water. Regular wood seasoning is done by air drying in conditions below 18 percent moisture. Advantages and disadvantages of air seasoning of timber compared to kiln drying continued from timber kiln drying equipment kilns can dry to lower moisture contents than can air seasoning in fact we must use kilns in countries having cool, moist weather conditions such as u. Wood is a natural material that has been used for the construction of buildings, bridges and various other structures since many centuries. If you know the answer to this question, please register to join our limited beta program and start. More than half the weight of freshly cut timber consists of moisture or sap.
When wood is used as a construction material, whether as. Free unfinished flashcards about seasoning of timber. Artificial seasoning of timber, civil engineering, assignment. Different ways of seasoning wood home guides sf gate. Before the timber can be used a large part of the moisture must be removed. However, the natural characteristics of most timbers have some related disadvantages, these disadvantages can be. Kiln seasoning is carried out in a thermally insulated chamber, a type of oven, that produce the appropriate temperatures to complete the processes, such as hardening, drying, or chemical changes.
Timber is a natural product and every natural product has some imperfections. Advantages of natural seasoning of wood aboutcivil. The stack is slanted to facilitate drainage of rain. Aug 27, 2016 the 6minute video explains the felling harvesting of natural woods, rough cutting and seasoning.
The seasoning yard should be paved and well drained, and the timber supported on cast iron bearers, and piled so as to admit of the free circluation of air over all the surfaces of the pieces. A wellseasoned timber has 15% moisture content in it. This document has been scanned from hardcopy archives for. Wood has the possibility to undergo cracking or creep if not subjected to proper seasoning. May 11, 2007 seasoning is the process of drying timber to remove the bound moisture contained in walls of wood cells, producing a new product called seasoned timber. The kiln seasoning process may change the natural colour of the timber especially for you who prefer to use the natural colour for your construction.
Detail explanation along with advantages and disadvantages of these methods of seasoning is discussed below. To improve structural performancea prerequisite to the allocation of seasoned timber strength sd and joint groups jd is that the average moisture content in the piece be no more than 15%. Jun 06, 20 advantages and disadvantages of timber houses june 6, 20 erin emanuel 5 comments timber has been around longer than we have, and since the prehistoric man first stepped foot out of his cave, it became the widest spread material for building shelters. Well, from the benefits of kiln seasoning and the disadvantages of this method mentioned above, what is your decision. Air dried seasoning kiln dried seasoningthere are advantages and. Seasoning of woods or timbers using natural elements is called natural seasoning. The roof and two other sides keep the timber relatively dry. For instance, the stacks of timber require a lot of land, the process may lead to a potential fire hazard, and the product is not able to be sold for a considerable time. By using artificial seasoning with a kiln, you reduce the time necessary to dry your wood. This is simply the weight of water contained in a piece of timber compared with the weight of actual woody substance in the same piece. Wood is a plantbased material, which means that it is very sensitive to environmental conditions and wood. The links below will take you to information and worksheets on the preparation of natural wood. Papers past newspapers clutha leader 18 april 1884.
When the logs are placed in running water, the sap from the cells can be easily washed out. While little additional energy needs to be supplied for this type of seasoning, there are still disadvantages. For the general purposes of carpentry, timber should not be used in less than two years after it is felled. A few of these disadvantages include timber is easy to burn, water can absorb into the material and causing mold and rot, timber can lead to wildlife extinction and the noise level from footsteps can be audible. The timber is stacked with wide spaces between each piece horizontally, and with strips of wood between each layer ensuring that there is a vertical separation too. After artificial seasoning the wood becomes harder, whereas in natural seasoning the wood becomes soft. Wood drying also seasoning lumber or wood seasoning reduces the moisture content of wood before its use. Jan 24, 2020 the different type of defect of timber are given below.
Timber disadvantages become advantages landmark products. Advantages and disadvantages of air seasoning of timber. Advantages and disadvantages of the two types of seasoning. When you are using a natural drying process, you are at the mercy of the weather to give you ideal wooddrying conditions. This is as yet the most common process of seasoning of timber used throughout the world. Moisture content of wood can be brought down to about 10 20% by natural seasoning.
The pores in the wood grain handle all the distribution, allowing the remaining timber grain to become denser. This method is a quick process of seasoning the timber. Seasoning is not always uniform in all the sections of timber. Natural seasoning may be water seasoning or air seasoning. Decreased seasoning defects warping, checks, splits, etc. In ordinary seasoning processes wood dries from the outside in, a fact which explains why wood so often checks in drying. The process has undergone a number of refinements over the years that have made it more efficient and reduced the quantity of wood that was damaged by drying too quickly near the ends in air seasoning.
It is normally placed in a hut building, with two sides open to allow air to circulate. Air seasoning the easiest way, but not the most effective method of seasoning timber, is to stack it outside. We may summarize the objectives of seasoning of timber in five sentences. The timber once constructed will demand for proper maintenance. With this process the timber is roughly sawn to size and stacked using spacers called stickers, with the timber stacked in the open air. Timber on the stump can contain rot, insects, carpenter ants, etc. There are two methods of seasoning of timber which are explained below. Research is ongoing in to how to season timber, using the minimum of energy and causing as little damage to the timber as possible. Removal of wood sap immersing logs into water flow is called water seasoning. Seasoning when a tree is initially cut it is extremely wet, with 85 per cent water content. Here also different methods of artificial seasoning are there and they are as follows. When wood is properly chemically seasoned the wood dries from the inside first.
Seasoning is the commercial drying of timber which reduces the moisture content of wood. This group includes all those defect that are developed on a tree during its growth. Sep 23, 2012 timber seasoning and laminationanswer the following questions relating to timber seasoning and lamination. Most of the defects in timber cause weakness or others sorts of difficulties. Seasoning seasoning is the process of drying moisture from timber. It is often chosen due to its good lasting performance and natural appearance, depending on timber typegrade. Vertical spacing achieved by using timber battens 25mm of the same species. The basic principle is to stack the timber so that plenty of air can circulate around each piece. By reducing moisture content, the strength, elasticity and durability properties are developed. Placed off ground sticks placed in between air circulates covered ends of timber are painted prevents ends drying at different speed natural seasoning timber drying out at own pace cheapest method what are the disadvantages to this method. Solar seasoning a combination of air and kiln seasoning.
In air seasoning, the boards are stacked and divided by narrow pieces of wood called stickers so that the air can circulate freely about each board. Authentic hardwood timber is praised for its unprecedented style and performance. Natural seasoning is performed simply by exposing the timber freely to the air in a dry place, sheltered, if possible, from sunshine and high winds. The timber is often dried to 1012 per cent for indoor use through a process called seasoning. Time required for natural seasoning of timber is around 120 to 180 days.