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Frame material guide

All frame materials

Engineered wood with exterior cladding

Three-lamella engineered timber inside the room paired with weather-resistant aluminum or vinyl cladding on the outside.

3D window model

The window with a frame of each material

Engineered wood with exterior cladding

Drag or press ← → to rotate; Home resets the view

Switch between vinyl, fiberglass and wood to see the window with that frame; drag or use ← / → to rotate it.

What it is and how it is built

A core glued from several kiln-dried wood layers, which resists warping better than solid timber. On the weather side it is covered by formed aluminum or vinyl cladding with a drainage gap, and weatherstripping seals the sash against the frame.

Why you'd want it

Clad wood is the frame for a real wood interior: stained or painted timber that matches the trim, the floors and the millwork, and the traditional proportions that historic homes and districts often ask for. The cladding takes the weather outside, so there is no exterior scraping and painting.

Vinyl and fiberglass need less care and usually cost less; wood is chosen when the look and feel of the room matter most.

Pros and cons

Pros

  • Real wood inside that can be stained or painted to match the room.
  • Wood insulates well, and the cladding protects the exterior from rain and sun.
  • Fits historic homes and districts that expect traditional wood sash profiles.

Cons

  • Usually the most expensive of the three, or close to fiberglass, depending on the cladding and the wood.
  • The interior finish needs refreshing from time to time so the wood does not absorb moisture.
  • Wood moves with humidity, and standing water can damage it in wet rooms.

It's for you if…

  • You want stained or painted wood inside to match historic trim, cabinetry or millwork.
  • Your neighborhood or historic district expects traditional wood sash profiles and proportions.
  • You choose aluminum or vinyl cladding so you do not have to scrape and repaint the outside.

Don't overpay if…

  • You plan to paint the interior white anyway, where painted wood looks much like smooth vinyl or fiberglass.
  • The window sits in a bathroom with a lot of splashing or in a damp basement, where water can damage the interior wood.
  • You want an install-and-forget frame with no interior refinishing over the years.

How it affects the price

Clad wood is usually the most expensive of the three or close to fiberglass: it takes two materials, the glued wood core and the exterior cladding, and more work to finish the interior. Vinyl costs less because it is a single extruded profile with no finishing.

Within wood the price moves with the species and the interior finish, aluminum or vinyl cladding, the exterior color, the size of the opening and the number of sashes. The market reference for each material is on the page of all frame materials.

All materials and their price references →

Lifespan and care

Keep the weep channels of the cladding clear and wash the cladding once or twice a year. Inside, wipe condensation off the glass and the sill promptly in winter, and look over the interior finish each season: where it wears or cracks, refresh the stain or paint so bare wood never stays open to moisture. Well-built and well-maintained wood windows can last a very long time.

Figures with sources

Frame U-factor of wood frames
0.30 to 0.50 Btu/hr-sq. ft-°FSource:Window Technologies: Frame Types – Non-metal Frames — NFRC Consumer Guide to Windows (Efficient Windows Collaborative)
Expected life of wooden windows
Upwards of 30 yearsSource:Study of Life Expectancy of Home Components — NAHB / Bank of America Home Equity (February 2007)
How wood frames react to the weather
They expand and contract in response to weather conditionsSource:Types of Windows — U.S. Department of Energy, Building Science Education Solution Center

What it pairs with

A clad wood frame is usually paired with a double-pane glass unit and a Low-E coating that keeps the room warm and protects wood floors and furniture from fading. In an older house, the installation method matters: an insert keeps the old frame and trim, while a full-frame replacement lets you check and seal the opening.

Double-pane glass for a wood frame →Insert or full-frame replacement in an older house →Choose a glass coating →

Compared with the other frames

Published market range

Your estimate shows prices for your windows and installation.

Frequently asked questions

What is cladding, and how is aluminum cladding different from vinyl?

Cladding is a factory-finished shell over the outside of the wood frame that takes the rain and sun. Aluminum cladding is rigid and comes in many colors, including dark ones; vinyl cladding is usually simpler and offers fewer colors.

How often should the interior finish be refreshed?

It depends on the sun and the humidity of the room: check the finish each season and refresh it every several years, or sooner where it wears, cracks or the wood darkens from water.

Is wood a good choice for a bathroom or a basement?

Usually not: splashes and standing moisture are hard on the interior wood. In wet rooms, vinyl or fiberglass is easier to live with, while wood can stay in the rest of the house.

Is wood allowed in a historic district?

Wood is often the material such districts expect, but the rules are local. Check the requirements of your historic commission or homeowners association before you order.

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