The Basics of Window Cladding
Cladding is a protective layer on the outside face of a frame. In most modern construction, that layer is aluminum. The shell covers the wood on the outside and takes rain, snow, sunlight, and wind. Inside, natural wood stays visible and touchable. So you get the strength of metal and the warmth of wood in one frame.
Cladding is not paint or a thin film. It is a formed metal profile wrapped around the wood, typically powder coated or anodized, which adds another level of protection against corrosion and fading. The wood inside stays dry because the aluminum takes the weather.
What Are Clad Wood Windows?
Clad wood windows put a solid wood interior behind an aluminum exterior. The wood insulates and looks natural. The aluminum takes the moisture, UV, and temperature swings. Residential and light commercial work across North America uses this design.
At WANJIA Hiseng, the aluminum clad wood profile uses 6063-T5 aluminum. Casement windows get about 2.0 mm of cladding thickness. Sliding windows get about 1.5 mm. The wood species start with American oak as standard, then Burmese teak, dark walnut, cherry, and rosewood as upgrades. That range lets builders match interior trim or flooring without painting the window.
What are clad wood windows good for? Climates with heavy rain, coastal salt air, or strong sun. The aluminum exterior does not rot or warp. The wood interior keeps the frame rigid and cuts heat transfer. So less maintenance outside, a warm natural look inside.
How a Clad Window Is Built
A clad window starts with a wood frame. The wood gets machined, then aluminum cladding fits over the exterior. Joined so water cannot reach the wood. The glass unit sits in a notch 33 mm deep. That allows double or triple glazing with Low-E coatings.
Hardware mounts to the wood or through the frame depending on window type. Casement windows from WANJIA Hiseng use German brands like ROTO, SIEGENIA, or CMECH, while sliding and awning windows use CMECH, HOPPE, HOPO, or KINLONG. Single-hung windows use American Caldwell handles. Multi-point locking systems are standard on casement and awning units.
The exterior finish can be powder coating, anodizing, or a wood-grain texture. A full architectural color system is available, so the aluminum can match other metal elements on the building. Interior wood can be stained, painted, or left natural, depending on species and owner preference.
Clad vs. Solid Wood and All-Aluminum
Solid wood windows need regular painting or sealing on the exterior. Skip that care and the wood absorbs water, swells, and eventually rots. Clad windows remove that exterior maintenance. The aluminum shell does not need paint. Clean it with mild soap and water.
All-aluminum windows are strong and low maintenance, but they conduct heat quickly. That can lead to condensation on the interior frame in cold weather. A wood interior acts as a thermal break. It slows heat transfer and keeps the inside surface warmer, which is why wood clad windows work well in high-performance homes.
The trade-off is cost. Clad wood windows cost more than vinyl or basic aluminum windows. Manufacturing is more complex because two materials must be joined precisely. But the longer service life and lower exterior upkeep often offset that initial price over time.
What's a Flanged Window?
A flanged window has a nailing fin or mounting flange around the frame perimeter. This fin attaches the window to the rough opening during construction. The flange is nailed or screwed to the sheathing, then covered with flashing tape and the wall's exterior cladding.
What is a flanged window used for? New construction and full replacements where exterior siding is removed. The flange creates a continuous drainage plane. Installed correctly, it directs water away from the opening. Many clad wood windows are available with or without a flange, depending on installation method.
Windows with nailing flange vs without is a common question. A flanged window is faster to install in new construction. A non-flanged window, sometimes called a replacement window, fits into an existing frame and is secured with screws through the jambs. Both methods work. The flange is preferred when the wall is open and the weather barrier can be integrated properly.
Installation and Support
Get the frame level, square, and flashed right. Most air and water leaks trace back to the install, not the window. WANJIA Hiseng ships installation videos and written guides with every order. The technical team can jump on a remote call if you hit a snag.
Builders and dealers lean on that support. A window installed correctly runs for decades. The aluminum cladding shields the wood, but only if flashing and sealing are done right.
Lead time for clad wood windows sits at 25-30 business days, depending on design, materials, and order volume. You get a quote within 3 hours on average after we receive project details. Warranty changes by product and contract terms.
Choosing the Right Clad Window
Start with the opening type. Casement windows seal tight and move more air. Single-hung windows fit traditional styles, and the lower sash tilts in for cleaning. Sliding windows handle wide openings. Awning windows hinge at the top so they can stay open in light rain.
Next, glass. Double glazing is standard for most climates. Triple glazing with Low-E coatings is worth it in cold regions. Built-in grilles or lattice options give a divided-light look. Insect screens come with every opening type.
Then wood species and aluminum finish. American oak is a good default. Burmese teak and dark walnut add richness, cherry and rosewood go deeper. Aluminum can be powder coated in just about any color, or anodized for a metallic look. Match the window to the architecture, don't fight it.
For specific products, see our wood clad windows page or the casement windows overview. Comparing options? Our article on the best aluminum clad windows may help.
Frequently Asked Questions About Clad Windows
What is window cladding made of?
Usually aluminum. It gets formed into a profile that wraps the outside of a wood frame. Powder coating or anodizing goes on next. That finish protects the wood from moisture, UV rays, and temperature changes.
What are clad wood windows?
Solid wood inside, aluminum outside. The wood gives you insulation and a look people like. The aluminum takes the weather and cuts down on maintenance. That pairing shows up often in houses and commercial jobs.
What is a flanged window?
A flanged window has a nailing fin around the frame. The fin is what attaches the window to the wall sheathing. New construction makes heavy use of it. A non-flanged window instead gets secured through the frame into the rough opening.
Are clad windows worth the extra cost?
For a lot of projects, yes. The aluminum exterior removes the need to paint or seal the outside of the window at all. The wood interior helps thermal performance and adds value. Over time, lower maintenance and longer life can make up for the higher initial price.