Replacement Windows, Vinyl Padio Doors & Vinyl Siding    

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Dead-Air Space:  The air space between the panes of glass found in an insulated glass unit. 

Deadlite:  A piece of glass or insulated glass unit with a sash profile around it; not set within the main frame of a window unit.

Degree Day:  A unit that represents a one-degree Fahrenheit deviation from some fixed reference point (usually 65° F) in the mean, daily outdoor temperature.

Desiccant:  A material used in insulating glass units to absorb water vapor to prevent windows from fogging between the panes.

Design Pressure: A numerical value that defines the structural wind loading requirements (in pounds per square foot) for a building and the components and cladding of a building.  The higher the number the greater wind resistance.

Dew Point:  The temperature at which water vapor in air will condense at a given state of humidity and pressure.

Divided Light (Lite):  A window with a number of smaller panes of glass separated and held in place by muntins, grids or grilles.

DOE-2.1E:  A building-simulation computer program used to calculate total annual energy use.

Dormer:  A space which protrudes from the roof, usually including one or more windows.

Double Glazing:  In general, two pieces of glass separated by an air space within an opening to improve insulation against heat transfer and/or sound transmission. In factory-made double glazing units, the air between the glass sheets is thoroughly dried and the space is sealed airtight, eliminating possible condensation and providing superior insulating properties. A double pane window.

Double Hung Window:  A window that has two operable sash which slide up and down vertically.

Double-Strength Glass: Glass with a thickness of approximately 1/8".

Drip:  A projecting fin or a groove at the outer edge of a sill, soffit, or other projecting member in a wall designed to interrupt the flow of water downward over the wall or inward across the soffit.

Dry Glazing:  An alternative method of placing glass in a door or window. No glazing mastic is used. Dry
Glazing is recommended whenever reflective coatings are glazed to first surface.

Dual-Durometer:  An elastomeric material with two different degrees of hardness.

Double Pane:  In general, two pieces of glass separated by an air space within an opening to improve insulation against heat transfer and/or sound transmission. In factory-made double glazing units, the air between the glass sheets is thoroughly dried and the space is sealed airtight, eliminating possible condensation and providing superior insulating properties. A double glazed window.

Double Rafter:  The doubling (side by side) of the roof members to reinforce an opening in the roof for a slope-glazing installation.

Drip Cap: A moulding placed on the top of the head brick mould or casing of a window frame.