Sill

Related terms

• Sill Pan

  A waterproof tray at the base of a window rough opening that catches and drains any water that gets past the window to the exterior.

• Sidelite

  A fixed narrow glazed panel beside an entry door that adds light and a wider, grander look.

• Single-Hung Window

  A window with two sashes where only the bottom sash slides up to open; the top is fixed. The economical traditional double-hung alternative.

• Shim

  Thin tapered material used to plumb, level, and square a window or door in its opening before fastening. Improper shimming causes operati…

• Skylight

  A roof-mounted window for daylight and sometimes ventilation. Flashing and curb detailing are critical to prevent leaks.

• SHGC (Solar Heat Gain Coefficient)

  The fraction of solar heat a window admits (0–1); lower reduces cooling load. Climate determines whether high or low SHGC is desirable.

• Slab Door

  A door sold as just the panel, with no frame or hinges — used to replace a door in a sound existing jamb.

• Sash

  The framed, often movable panel that holds the glass within a window. Double-hung windows have an upper and lower sash.