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pack
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A unit of timber boards
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pack stick
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A strip of wood or another material that is placed between rows of timber or other wood products in a rack. Rack sticks are placed at right angles to the long axis of the timber to permit air to circulate between the layers. . Also referred to as “sticker” or “stripper”.
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pan european forest certification scheme
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The Pan European Forest Certification scheme was established in 1999. It is a voluntary private sector initiative which defines the basic requirements of forest certification according to the Pan European Criteria developed as a result of the resolutions of the Helsinki and Lisbon Ministerial Conferences of 1993 and 1998 on the Protection of Forests in Europe
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parabolic arch
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An arch whose curve is a parabola.
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parquetry flooring
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Flooring of small matching pieces of timber laid on a substrate in a geometric patterns.
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particle board
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A pressed sheet material made from particles of timber or other ligno-cellulosic material bonded with synthetic resin and/or other organic binder
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party wall
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A wall between two adjoining living quarters in a multi-family dwelling.
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patina
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A surface change due to age or use, such as the fine oxidation of copper or the weathering of wood
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PEC
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Pigmented emulsified creosote, a wood preservative.
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peel
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Converting a log into veneer by rotary cutting.
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performance based
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A code where the requirements are expressed as objectives to be achieved
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permanent set
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A change in the properties of wood which can occur during drying when stressing exceeds the elastic limit. Permanent set prevents normal shrinkage of the timber and can lead to more obvious defects such as casehardening and honeycombing.
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permeability
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The ease with which a fluid flows through a porous material (wood) in response to pressure.
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pier
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A column or post supporting a superstructure such as floor bearers, beams, etc., or an internal support for a bridge.
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pile
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A structural timber driven deep into soil or rock to provide a secure foundation for structures.
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pin joint
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A connection free to rotate like a hinge.
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pith
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The small soft core occurring in the centre of a tree trunk, branch, twig, or log.
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plain-sawn timber
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Timber converted so that the growth rings meet the face in any part at an angle of less than 45 degrees. Also called backsawn timber.
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plantation
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An intensively managed stand of trees of either native or introduced species, created by the regular placement of seedlings or seed
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plate
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A horizontal framing member laid flat.
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plumb
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Straight up and down, perfectly vertical.
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ply
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One layer of a laminated sheet.
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plywood
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An assembled product made up of veneers of timber glued together so that the grain of alternate layers is at right angles.
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pocket
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A patch of bark or gum (kino) completely or partially enclosed in the wood.
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pole
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A round timber column.
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polyethylene glycol
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A chemical pretreating agent used to improve the drying behaviour of timber.
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portal
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A planar frame where the lateral and bending forces are transferred by moment resisting connections from the portal rafters to the columns.
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post
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A column or a free standing axially loaded compression member, usually vertical
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post and beam structure
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A structural frame with repetitive columns and beams.
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predryer
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A structure similar to a kiln that is sometimes used in the initial stages of drying.
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predrying
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A wood drying process carried out in a predryer before kiln drying.
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prescriptive
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A code where the requirements are expressed as rigid rules or predetermined solutions
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preservative
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Any substance that is effective in preventing , for a reasonable period of time, the development and action of fungi, borer and insect attack in wood.
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presurfacing
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Surfacing of both broad faces of green rough sawn timber intended to permit drying by a schedule more severe than the prescribed schedule for rough sawn timber, achieving faster drying and fewer drying defects.
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pretreatment - pteaming
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A process sometimes carried out before commencing a drying schedule. The timber is subjected to atmospheric pressure steam. It is often carried out to fix or enhance colour.
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psychrometric charts
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A psychrometric chart or psychrometric table relates dry bulb temperature, wet bulb depression and humidity.
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purlin
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One of a series of horizontal framing timbers supporting the rafters or spanning between trusses or frames and supporting the roof. Purlins usually span at right angles to the slope of the roof
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push - pull racking
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A method for building racks where alternative boards in alternative layers are kept flush with alternate ends. This
gives a checkerboard arrangement at the ends of the rack. It is also called topping & tailing.
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