rabbet: A plough cut that is made along the edge of a board, or a dado cut that is made across the end of a board.

radial shrinkage: Reduction in the size of a piece of lumber that occurs across the growth rings during drying.

radius: A border pattern designed to reflect a curved room element

rails: The horizontal parts of a door frame that connects two styles. Each door has a top rail and a bottom rail.

raised grain: A roughened or fuzzy condition on the face of the flooring in which the dense summer wood is raised above the softer springwood, but not torn or separated.

raised panel door: A door frame using a raised panel insert with vertical panel grain. This panel fits inside the frame.

rake: Pitch or angle. May refer to the angle at which the leading edge of the teeth are cut on a saw blade.

random widths and lengths: Containing a selection of the range of widths and lengths allowed in a grade of lumber.

reaction wood: Wood that has different characteristics than normal wood because it is formed during abnormal growth due to external stresses.

reclaimed lumber: Lumber that has been salvaged from an existing building for reuse.

red knot: A knot that will not fall out of its position in a sawn board.

reducer strip: A teardrop shaped moulding accessory for hardwood flooring, normally used at doorways , but sometimes at fireplaces and as a room divider. It is grooved on one edge and tapered or feathered on the other edge.

relative humidity: Ratio of the amount of water vapor present in the air to that which the air would hold at saturation at the same temperature.

resaw: The process of sawing lumber in half lengthwise, parallel to the wide face. Usually, but not always through the middle of the board, producing two equal sized boards, half the original thickness, but the same width and length.


resin bleed through: A condition in which resin, usually in a knot, migrates through a finishing agent. As in painted Knotty Pine.

retain: A representative liquid sample taken from a production batch which verifies the quality the customer receives.

rewet: The ability of a film to be dissolved by a solvent.

RGH: Short for “rough” a lumber description meaning not yet planed or surfaced.

ribbon stripe: A type of wood figure where there are stripes or ribbons of alternating lighter and darker color that run along the full length of the plank (with the grain) Due to interlocked grain.

rift sawn: Similar to quarter sawing with many of same advantages and limitations. Rift sawing accentuates the vertical grain and minimizes the flake effect common in quarter sawn oak. The angle of the cut is changed slightly (30 to 60 degrees)so that fewer saw cuts

ring porous: A group of hardwoods in which the pores are comparatively large at the beginning of each annual growth ring and decrease in size, more or less abruptly, toward the outer portion of the annual growth ring. The large pores are springwood and the smaller por

ring shake: Aform of shake in which the wood separates along the boundary between early growth and late growth.

rip: To create a rip cut, a rip cut.

rip cut: To cut parallel to the grain of wood, a cut that goes along the grain of wood.

ripping: Making a rip cut. Ripping a plank makes two planks, each narrower than the original, but with the same thickness and length.

rise: In stairs, the vertical distance from the surface of one of the treads in a staircase to the surface of the next tread.

riser: The vertical plank in a closed staircase- between the treads.

roll: An application technique for applying a finishing agent or adhesive using a roller.

ropy: Possessing a sticky or stringy consistency that will not allow the material to level or flow out smoothly after application.

rosette: A decorative square plate with a cutout circular design centered in the middle.

rot: Also called decay. The breakdown of cells due to attack on the lignin and cellulose of the wood by microorganisms.

rotary cut: A veneer production technique where the log is put on a huge lathe-like machine with a long blade that runs the length of the log and slices the wood in a continuous sheet.

rough: The board as it comes from the saw.

rough cut: To cut a work piece slightly oversize in thickness, width and/or length prior to milling to final dimensions.

roughing planer: Is a special type of planer. Its function is to plane rough or un-milled lumber to even thickness. Also see planer.

round edge lumber: Lumber that has its natural edge on both sides of the plank.

runs: The result of spraying a heavier coat on a vertical or near vertical surface than the viscosity of the finish will allow to hold without movement. When in close multiples- also called sag.

rustic: A wood flooring grade in which planks are allowed to exhibit a full range of natural character.; Permits all knots and other defects on the front and edges including color variation. Classification of character markings and coloration with regard to chara