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Medium Density Fibreboard (MDF) A panel product, widely used as a substitute for plywood, particleboard and solid lumber; manufactured in a process where wood fibres, resin and wax is compressed under high pressure to form a panel.
Millwork Planed and patterned lumber for finish work in buildings, including items such as sash, doors, cornices, panelwork, and other items of interior or exterior trim, but not flooring or siding.
Mineral Spirits A petroleum derived solvent similar to gasoline, used primarily for thinning alkyd and other oil based coatings such as paint, stain, and varnish
Moisture Content The amount of water contained in the wood, expressed as a percentage of the weight of the oven-dry wood.
Moulding A wood strip having a curved or projecting surface used for decorative purposes.
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Noncombustible Construction A factor applied to factored loads, other than dead load, to take into account the consequence of collapse as related to the use and occupancy of the structure, as in Limit States Design.
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Oriented Strandboard (OSB) A panel product, used for sheathing, made from strands with the face wafers oriented in the long direction of the panel to provide additional strength in that direction.
Overlay A thin layer of paper, plastic, film, metal foil, or other material bonded to one or both faces of panel products, or to lumber, to provide a protective or decorative face, or a base for painting.
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Paint A coating containing enough pigment to create an opaque solid film after application as a thin layer.
Paint, Enamel A coating product characterized by ability to form a uniform hard film used for flooring and other high wear applications. Enamels may be obtained in a full range of colours and usually in gloss or semi-gloss.
Panel Point The point of intersection where the web or webs of a truss meet a chord.
Parallel Strand Lumber (PSL) A structural wood product made by gluing together long strands of wood which have been cut from softwood veneer.
Pith The small cylinder of primary tissue of a tree stem around which the annual rings form.
Pitch The accumulation of resin in wood.
Pitch Pocket An opening between growth rings which usually contains or has contained resin or bark or both.
Panel, Exterior A general term for plywood or OSB/waferboard, bonded with a type of adhesive that by systematic tests and service records has proved highly resistant to weather.
Panel, Interior A general term for a panel made from a type of adhesive which is not resistant to moisture and is therefore limited to uses where protection from moisture is provided.
Plywood A glued wood panel made up of thin layers of veneer with the grain of adjacent layers at right angles, or of veneer in combination with a core of lumber or of reconstituted wood.
Plywood, Standard Construction Panels constructed of pairs of plies that are balanced as to grain direction and thickness about the central ply or panel centreline, in which the grain of each ply is at right angles to at least one other ply.
Plywood, Modified Construction Panels which are not standard thickness or which have an even number of plies.
Plywood Stressed-Skin Panel A form of construction in which outer skins of plywood are applied over internal frame members to form a rigid structural element.
Polyurethane A paint and varnish resin which imparts good abrasion resistance and marketed under several trade names such as varathane, urethane, and durathane.
Post A timber with larger dimension not more than 51mm (2") greater than the smaller dimension and usually graded for use as a column.
Preservative Any substance effective in preventing the development and action of wood-rotting fungi, borers of various kinds, and harmful insects that cause the deterioration of wood.
Pressure-Treating The process of impregnating wood with preservative or fire retardant chemicals by placing the wood and chemical in a pressure chamber.
Pressure-Treating, Empty-Cell Process Pressure treating process in which back pressure from air drives out part of the injected preservative or chemical to leave the cell walls coated but the cell cavity mostly devoid of chemical.
Pressure-Treating, Full-Cell Process Pressure treating process in which a vacuum is drawn to remove air from the wood before admitting the preservation, resulting in a heavy absorption and retention of preservative due to the cells being almost filled.
Primer One or more preliminary base coats of paint system, applied prior to the application of finishing coats.
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Rafter One of a series of structural members of a roof designed to support roof loads.
Raised Grain A roughened condition of the surface of dressed lumber in which the hard latewood is raised above the softer earlywood but not torn loose from it.
Rays Strip of cells extending radially within a tree and varying in height from a few cells in some species to 100mm (4") which cause an appealing grain pattern.
Resin An ingredient of coatings which acts as a binder and gives the coating physical properties such as hardness and durability.
Resin (natural) Inflammable, water- soluble, vegetable substances secreted by certain plants or trees, and characterizing the wood of many coniferous species.
Rip A cut made lengthwise in a wood member, parallel to the grain.
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