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CertainTeed Vinyl Siding Installation Guide
146
GLOSSARY
Because this manual was written for building professionals, we have freely used the language and jargon of the siding
industry. To avoid confusion, we thought it a good idea to share our understanding of each of these terms with you.
Band Board—A decorative piece of horizontal trim placed between two floors along the rim joist.
Beaded—A narrow, half-round molding at the base of a lap siding panel.
Casing—Molding of various widths used to trim door and window openings at the jambs; also referred to as lineal,
window, or door surround.
Contraction—Commonly refers to building products contracting due to outside temperature changes.
Course—A row of siding panels running the width of the wall.
Dormer—A gabled extension built out from a sloping roof to accommodate a vertical window.
Drip Cap—A horizontal flashing placed over exterior door or window frames to divert rainwater.
Dutchlap—Refers to a drop-style panel that was popularized by early American settlers in the seaboard states;
lap siding panel with a horizontal bevel at the top of the panel that sits just below the bottom of the next
course of siding.
Eave—The overhang of a pitched roof at the bottom edge, usually consisting of a fascia board, a soffit for a closed
cornice, and appropriate moldings.
Expansion—Commonly refers to building products expanding as outside temperature changes.
Exposure—The width of the exposed face of each panel of siding; also referred to as reveal.
Face—The side of the siding, trim, or soffit that is exposed to view after the product has been installed.
Fascia—A flat, horizontal band that covers the rafter tails and runs along the bottom edge of the roof line.
Flashing—A thin, impervious material, usually metal, placed around openings to prevent water penetration or to
direct the flow of water over the cladding.
Frieze—The horizontal trimboard connecting the top of the siding with the soffit.
Furring/Furring Strip— Long, thin strips of wood or other materials used to build out the fastening surface of a wall;
commonly used to correct imperfections in wall surfaces, to establish a rainscreen, or to re-establish a structural
fastening surface on the exterior of nonstructural products such as foam insulation.
Gable—The triangle formed on the side or the front of a building by a sloping roof.
Hot-dip Galvanized—The process of dipping metal into molten zinc to apply a protective coating that prevents
corrosion; hot-dipped galvanized iron and steel are corrosion resistant.
Keyway—A recess or groove in a manufactured shake or shingle siding panel.
Lap—Where two siding panels join horizontally, one over the other.
Lineal—Molding of various widths used to trim door and window openings at the jambs; also referred to
as casing, window, or door surround.
Miter Cut—A beveled cut, usually 45°, made at the end of a piece of molding or board that is used to
form a mitered joint.