Replacement Windows, Vinyl Padio Doors & Vinyl Siding    

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

M

Main Frame:  The head, sill and jamb sections of a window.

Masonry Openings:  The opening in a masonry wall to accept a window or door unit, the same as a rough opening in a frame wall.

Mechanically Fastened Frame:  Frames fastened together with screws.

Meeting Bar:  See meeting rail or check rail.

Meeting Rail:  The horizontal sections of a sliding glass door, a sliding window, or a vertical operating window where the two sashes meet and create a weather barrier when the sashes are closed.   Also known as the meet bar or check rail.

Meeting Stile:  The vertical section of a pair of sashes that meet when the sashes are closed.

Mesh:  Fabric made of either fiberglass or aluminum, used in the making of screens.

Metal-Clad Windows:  Exterior wood parts covered with extruded aluminum or other metal, with a factory-applied finish to deter the elements.

Mil:  One thousandth of an inch, or 0.0254 millimeter.

Moisture Barrier:  A material which retards the passage of water vapor from one space to another. Polyethylene sheet is commonly used as a vapor retarder.  Also, known as vapor barrier.

Molding: An ornamental exterior trim around the perimeter of a frame.

Moulding:  British spelling of mold.

Mortise:  A slot or rectangular cavity cut into a piece of wood to receive another part.

Mortise-and-Tenon:  A strong wood joint made by fitting together a mortise in one board and a matching projecting member (tenon) in the other.

Mullion:  A vertical or horizontal structural member connecting windows or sliding glass doors.  Used when two or more separate windows are installed into a single opening. This bar supports where the windows meet in the opening.

Mullion Casing:  An interior or exterior casing member to cover the mullion joint between single windows.

Muntin:  A bar that’s used to divide panes or hold the window panes in the sash.  Also known as a grille or grid.

Muntin Grilles:   Wood, plastic, or metal grids designed for a single-lite sash to give the appearance of muntins in a multi-light sash, but sometimes removable for ease in cleaning the window. They are also called grids.  The most common grid pattern is colonial.

Mylar:  Trade name for a clear, durable plastic sheet used for covering an inside storm panel or for removable, roll-up glazing over an entire window frame.