Carpentry

In the UK, carpentry is more correctly used to describe the skill involved in first fixing of timber items such as construction of roofs, floors and timber framed buildings, i.e. those areas of construction that are normally hidden in a finished building. An easy way to envisage this is that first fix work is all that is done before plastering takes place. Second fix is done after plastering takes place. Second fix work, the installation of items such as skirting boards, architraves, doors and windows is generally regarded as carpentry, however the off-site manufacture and pre-finishing of the items is regarded as joinery.[6][7] Carpentry is also used to construct the formwork into which concrete is poured during the building of structures such as roads and highway overpasses. In the UK, the skill of making timber formwork for poured or in situ concrete is referred to as shuttering.

Carpentry in the United States is historically defined similarly to the United Kingdom as the “heavier and stronger”[8] work distinguished from a joiner “...who does lighter and more ornamental work than that of a carpenter...” although the “...work of a carpenter and joiner are often combined.”[9] Joiner is less common than the terms finish carpenter or cabinetmaker. The terms housewright and barnwright were used historically., now occasionally used by carpenters who work using traditional methods and materials. Someone who builds custom concrete formwork is a form carpenter.

By the beginning of the Ming dynasty, emperor Taizu categorized people into different occupations. At this time, all the carpenters throughout the state were registered by the imperial court, and the occupation remained strictly hereditary, according to the notes from historian Klaas Ruitenbeek.[12] In later times of the Ming dynasty, roughly in the 1560s, however, people broke such restrictions, and the path into the occupation in the case of the carpentry became less fixed. Although the restriction regarding the path into the occupation dissolved in later times of the Ming dynasty, approximately starting from 1450s.[13] The Lu Ban Jing (鲁班经) was named after the Chinese patriarch of carpenter, Lu Ban. Lu Ban lived in the Zhou dynasty, 2,500 years from modern day and nearly 2,000 years from the beginning of the Ming dynasty. Although the Lu Ban Jing was entitled as the classic of Lu Ban, it was compiled during the Ming dynasty.[13] One interesting fact about the Lu Ban Jing is that it included a detailed biography of Lu Ban and his wife Lady Yun(云氏). According to the biography, Lady Yun was "blessed with heavenly skills"[14] and she could produce products with higher quality than those produced by Lu Ban.

Being a carpenter requires a set of techniques, especially for the household carpenters. From the first to the last day of the construction, sometimes even long before the beginning of construction, carpenters must treat their work with a lot of care. With their meticulousness and perseverance, their products were so sophisticated that it appeals to the untrained peoples as impossible. Moreover, in Ming times, people believed that certain behaviors bring good or bad fortunes, and the carpenters were responsible for helping their customer to make decisions. Questions like when to build the house, and which direction should the house face toward were among some of the most frequently asked. As a result, the techniques were both practical and metaphysical, include accurate calculation, using proper tools, avoiding ominous actions, singing for good fortunes, and choosing ideal locations for houses.[15] Interestingly is that the carpenters in China will sing prayer songs for their customer to pray for good fortune. The good fortunes involve a series of good things, including wealth, reputation, social ranking, and the sustainability of families. Historian Ronald Knapp recorded one of them in his book China's Living Houses: The Phoenix does not light where there are no treasures. Today it perches at the end of the ridgepole. With one swing of my axe, the house will be solid forever. Ten thousand years solid, then thousand years prosperous, riches and position, a Number One family (凤凰不落无宝地，今日落在脊口里。我将钢斧一摇，一斧打的万年牢。万年牢万年发，富贵荣华头一家).[16]

The carpenters in Ming China, and particularly the first century of Ming China, experienced the division of labor process. Ruitenbeek emphasizes that the carpenters were divided into two categories, the “resident artisans” and the “shift artisans.”[17] The resident artisans, according to Ruitenbeek, lived in the capital of Ming China (first Nanjing, then Beijing) because of the forced immigration launched by Ming Taizu. They were required to do ten days for each month in the imperial palace. According to the difference of their household register, these resident artisans were further categorized as military carpenters and civil carpenters. The military carpenters belonged to the division of defense, and were required to produce useful items for the military, such as bows and cannon supports. The civil carpenters belonged to the Board of Work.[18] The shift artisans, on the other hand, did not need to reside in capital regions, but they were required to complete service on behalf of the Board of Work. Meanwhile, carpenters in Ming China also avoided intrinsic competitions by establishing guilds. Guilds were long-lasting in premodern China, and by the late Ming times, it developed into institutions with complete regulations seeking to minimize intrinsic competitions. Ruitenbeek provides a framework for the guilds of carpentry in Ming times: There was a system of apprentice, journeyman and master. Welfare was an important task of the guilds; it ensured, for example, a decent burial for its poorer members.[19]

Speaking of the codes among the carpenters in the Ming dynasty, it included a set of rituals or taboos generated by people within the occupation. In the case of carpentry, the Lu Ban Jing regulates carpenter's behavior as it provides a thorough, “from-cradle-to-tomb-style” of guidelines for the carpenters. The Lu Ban Jing also set the rituals for the carpenters when they were given magical spells. Those magical spells, according to Lu Ban Jing, requires a complicated process of preparing the materials and praying for its effectiveness. For instance, carpenters can deliver a curse that forced people to die in river or in water wells. Such curse needs a wooden boat, and the carpenters have to turn the boats upside and bury the wooden boat at the northern corner of the house.[20] The mythical traditions for carpenters to deliver blessings and curses are various, and such mysterious rituals negatively influenced people's impression of carpenters in Ming times.

By the 16th century sawmills were coming into use in Europe. The founding of America was partly based on a desire to extract resources from the new continent including wood for use in ships and buildings in Europe. In the 18th century part of the Industrial Revolution was the invention of the steam engine and cut nails.[21] These technologies combined with the invention of the circular saw led to the development of balloon framing which was the beginning of the decline of traditional timber framing.

Axonometric diagram of balloon framing

The 19th century saw the development of electrical engineering and distribution which allowed the development of hand-held power tools, wire nails and machines to mass-produce screws. In the 20th century, portland cement came into common use and concrete foundations allowed carpenters to do away with heavy timber sills. Also, drywall (plasterboard) came into common use replacing lime plaster on wooden lath. Plywood, engineered lumber and chemically treated lumber also came into use.[22]

Breve compendio de la carpinteria de lo blanco y tratado de alarifes (1727)

For types of carpentry used in America see American historic carpentry.

Formal training in the carpentry trade is available in seminars, certificate programs, high-school programs, online classes, in the new construction, restoration, and preservation carpentry fields.[23] Sometimes these programs are called pre-apprenticeship training.

In the modern British construction industry, carpenters are trained through apprenticeship schemes where general certificates of secondary education (GCSE) in Mathematics, English, and Technology help but are not essential. However, this is deemed the preferred route, as young people can earn and gain field experience whilst training towards a nationally recognized qualification.

There are two main divisions of training: construction-carpentry and cabinetmaking. During pre-apprenticeship, trainees in each of these divisions spend 30 hours a week for 12 weeks in classrooms and indoor workshops learning mathematics, trade terminology, and skill in the use of hand and power tools. Construction-carpentry trainees also participate in calisthenics to prepare for the physical aspect of the work.

Upon completion of pre-apprenticeship, trainees who have successfully passed the graded curriculum (taught by highly experienced journeyman carpenters) are assigned to a local union and to union carpentry crews at work on construction sites or in cabinet shops as First Year Apprentices. Over the next four years, as they progress in status to Second Year, Third Year, and Fourth Year Apprentice, apprentices periodically return to the training facility every three months for a week of more detailed training in specific aspects of the trade.

Tradesmen in countries such as Germany and Australia are required to fulfill a formal apprenticeship (usually three to four years) to work as a professional carpenter. Upon graduation from the apprenticeship, he or she is known as a journeyman carpenter.

Up through the 19th and even the early 20th century, the journeyman traveled to another region of the country to learn the building styles and techniques of that area before (usually) returning home. In modern times, journeymen are not required to travel, and the term now refers to a level of proficiency and skill. Union carpenters in the United States, that is, members of the United Brotherhood of Carpenters and Joiners of America, are required to pass a skills test to be granted official journeyman status, but uncertified professional carpenters may also be known as journeymen based on their skill level, years of experience, or simply because they support themselves in the trade and not due to any certification or formal woodworking education.

Professional status as a journeyman carpenter in the United States may be obtained in a number of ways. Formal training is acquired in a four-year apprenticeship program administered by the United Brotherhood of Carpenters and Joiners of America, in which journeyman status is obtained after successful completion of twelve weeks of pre-apprenticeship training, followed by four years of on-the-job field training working alongside journeyman carpenters. The Timber Framers Guild also has a formal apprenticeship program for traditional timber framing. Training is also available in groups like the Kim Bồng woodworking village in Vietnam where apprentices live and work to learn woodworking and carpentry skills.

In Canada, each province sets its own standards for apprenticeship. The average length of time is four years and includes a minimum number of hours of both on-the-job training and technical instruction at a college or other institution. Depending on the number of hours of instruction an apprentice receives, he or she can earn a Certificate of Proficiency, making him or her a journeyman, or a Certificate of Qualification, which allows him or her to practice a more limited amount of carpentry. Canadian carpenters also have the option of acquiring an additional Interprovincial Red Seal that allows them to practice anywhere in Canada. The Red Seal requires the completion of an apprenticeship and an additional examination.

After working as a journeyman for a while, a carpenter may go on to study or test as a master carpenter. In some countries, such as Germany, Iceland and Japan, this is an arduous and expensive process, requiring extensive knowledge (including economic and legal knowledge) and skill to achieve master certification; these countries generally require master status for anyone employing and teaching apprentices in the craft. In others, like the United States, 'master carpenter' can be a loosely used term to describe any skilled carpenter.

Fully trained carpenters and joiners will often move into related trades such as shop fitting, scaffolding, bench joinery, maintenance and system installation.

Carpentry is often hazardous work. Types of woodworking and carpentry hazards include machine hazards, flying materials, tool projection, fire and explosion, electrocution, noise, vibration, dust and chemicals. In the United States the Occupational Safety and Health Administration (OSHA) tries to prevent illness, injury and fire through regulations. However, self-employed workers are not covered by the OSHA act.[25] OSHA claims that "Since 1970, workplace fatalities have been reduced by more than 65 percent and occupational injury and illness rates have declined by 67 percent. At the same time, U.S. employment has almost doubled."[26] The leading cause of overall fatalities, called the "fatal four," are falls, followed by struck by object, electrocution, and caught-in/between. In general construction "employers must provide working conditions that are free of known dangers. Keep floors in work areas in a clean and, so far as possible, a dry condition. Select and provide required personal protective equipment at no cost to workers. Train workers about job hazards in a language that they can understand."[27] Examples of how to prevent falls includes placing railings and toe-boards at any floor opening which cannot be well covered and elevated platforms and safety harness and lines, safety nets, stair railings and hand rails.

Safety is not just about the workers on the job site. Carpenters work needs to meet the requirements in the Life Safety Code such as in stair building and building codes to promote long term quality and safety for the building occupants.