Vertical members of a window sash or panel door.

Window frames made of impact-resistant PVC. They resist heat loss and condensation but are not designed to be painted.

Material that reduces the rate at which water vapor can pass through. This type of barrier is often referred to as a vapor diffusion retarder or vapor retarder.

The lowest framing member of a window or exterior door frame.

The part of a window that holds the glass.

Narrow, tapered pieces of wood or composite material used to plumb or level a door or window.

A framework on which a skylight is mounted.

An approach to controlling water vapor present in soil beneath a slab. It is not designed to stop the influx of liquid water.

Trim around a window or door.

A free-standing non-structural wall consisting of frames that can be filled with either glass or metal panels. Curtain walls are designed to protect buildings from air infiltration.

Resilient material added to a joint to allow expansion and contraction of adjacent materials while minimizing cracking.

Material such as glass or plastic used in windows, skylights, and doors.

The side of the door jamb into which the hinges are installed.

Sheet metal strips used to seal a roof or wall against leakage.

Made of spun, high-density polyethylene fibers randomly bonded into an extremely tough, durable sheet material and used to minimize air infiltration while allowing moisture to escape.

The physical separator between a building’s conditioned and unconditioned environment. The _______ _______ consists of components such as exterior doors and windows, basement walls, exterior walls, the concrete slab, and roof.

The external angle formed by the intersection of two adjacent sloping sides.

An area of a building in which heating and/or cooling is deliberately supplied to it or is indirectly supplied through uninsulated surfaces of water or heating equipment or through uninsulated ducts.

A value obtained by dividing the rate of heat transfers through a structure by the difference in temperature across the same structure. Lower U-values indicate a building is well insulated.

Measure of effectiveness of a material to insulate another material. A higher _______ indicates a higher insulating value.

A wall opening that admits light and/or ventilation.

The top and sides of a door or window frame that are in contact with the door or sash.

A measure of how much water vapor can pass through a barrier.

Method of exterior finish consisting of an insulation board attached either adhesively or mechanically, or both, to the substrate; an integrally reinforced base coat and a textured protective finish coat.

Window frames made of small glass fibers and resin. These fibers are arranged so that the frames are typically stronger than vinyl and wood frames.

Glass insert in a door.

Glass used in windows that has improved insulating properties in both the summer and winter.

A piece of wood or metal that is set between the door jamb and the bottom of a door opening.

Paths of least resistance where heat travels from one side of the building envelope to the other. _______ _______ can result in increased energy required to heat or cool a conditioned space due to winter heat loss and summer heat gain.

Horizontal members of a window sash or panel door.

A thin framework used to secure panes of glass in a window or door.

Panels that serve as a continuous insulation layer to reduce heat loss via thermal bridges, and lower long-term energy costs.