Pick the right material for your project, aesthetic and budget.

Aluminum-clad wood

Wood covered with a layer of aluminum.

EnduraClad® finish

Pella's durable baked-on finish that's applied to the aluminum clad exteriors of our wood windows and patio doors.

Fiberglass composite

Fiberglass and other materials bonded together.


Pella's patented five-layer, engineered fiberglass composite used to make Pella Impervia® windows and patio doors.


A sustainable, high-grade resin or polymer material.

Insulating glass

Two sheets of glass with a sealed airspace in between them.


A colorless gas inserted between the panes of insulating glass to provide extra insulation from the heat and cold.


Another word for the glass in windows and doors.


Pella's wood protection formula.

R Values and Other Terms


Indicates the resistance to heat flow through a window.


Represents the rate of heat flowing out of a window or door in an hour's time. The lower the number, the better the glass insulates.

Solar Heat Gain Coefficient (SHGC)

Measures the amount of the heat from the sun that enters through a window. The lower a window's SGHC, the less solar heat it allows into your home.


Low-emissivity coatings on window glass that reflect heat energy and block the sun's fading rays.


ENERGY STAR is a joint program of the U.S. Environmental Protection Agency and the U.S. Department of Energy helping us all save money and protect the environment through energy- efficient products and practices.

NFRC label

This label, from the National Fenetration Rating Council, is required by the window and door industry to be on every product to help the consumer compare energy performance.