To overlap the ends of two siding panels or accessory pieces to allow for expansion and contraction of the vinyl product.

for raising the lower sash in a double-hung window. Also called sash lift.

A unit of glass in a window.

Microscopically thin, virtually invisible, metal or metallic oxide layers deposited on a window or skylight glazing surface primarily to reduce the U-factor by suppressing radiative heat flow. A typical type of low-E coating is transparent to the solar spectrum (visible light and short-wave infrared radiation) and reflective of longwave infrared radiation.

The raised “ears” or tabs on a siding panel, created by a snaplock punch, which can be used to lock a siding panel into place when the nailing hem has been removed.