Substances such as tannin in wood that are not an integral part of the cellular structure and can be removed in solution by solvents, such hot or cold water, that do not react chemically with wood substances.
A comprehensive guide to the most common timber terms from A to Z.
Extractives
Face Nailing
Nailing at right angles to the surface.
Fascia
A vertical board nailed to the lower ends of rafters.
Feature
Any irregularity or imperfection in a tree, log, board, or other wood product. Feature may result from knots and other growth conditions and abnormalities, insect or fungus attack, or during timber processing.
Fibre
Small diameter, thick walled cells in hardwoods. Fibres dominate the structural behaviour of hardwoods.
Fibre Saturation Point
The point in the seasoning or wetting of timber at which the cell cavities are free from water but cell walls are still saturated with bound water. It is taken as approximately 25-30% moisture content.
Fibreboard
A generic term including sheet materials of widely varying densities manufactured from refined or partially refined wood or vegetable fibres. Bonding agents and other materials may be added to increase strength or to improve other properties.
Fiddleback
Figure in timber or veneer produced by small, regular undulations in the grain
Figure
The pattern produced on the cut surface of wood by annual growth rings, rays, knots, deviations from regular grain such as interlocked and wavy grain, and irregular coloration.
Finger Joint
An end joint in which wedge shaped projections in one piece of timber fit matching recesses on the other piece and are bonded together by an adhesive.
Flashing
A strip of impervious material fitted to provide a barrier to moisture movement into the interior of a building
Flexural Strength
The resistance at failure of a beam subjected to bending
Flitch
A large piece of log, sawn on at least two surfaces, intended for further cutting.
Floor Board
Boards dressed to standard thickness and generally finished with a tongue and groove, fixed to floor joists or a substrate to provide a floor.
Flooring
The covering of internal floors in a building. Timber flooring includes tongue and groove strip flooring, parquetry, panel flooring, particleboard and plywood.
Folded Plate
The configuration of flat sheets, such as plywood, into a folded form to produce a beam of considerably higher strength and stiffness than is possible with the flat sheet alone.
Forest Estate
All forests growing on public or private lands
Forest Practices
Forest practices means the processes involved in establishing forests, or growing or harvesting timber, and includes a) the construction of roads; and b) the development and operation of quarries; and c) other works connected with establishing forests, or growing or harvesting timber
Forest Stewardship Council
FSC is a global, not-for-profit organization dedicated to the promotion of responsible forest management worldwide
Frame
1. The main timbers of a structure fitted and joined together. 2. A three dimensional self-contained structural system of interconnecting members which functions with or without the aid of horizontal diaphragms or floor bracing systems.
