The sun coming out is a glorious thing, especially here in the cloudy Pacific Northwest. But that summer sun also comes with some harsh UV rays that can fade furniture and artwork. You may have asked yourself: do windows block UV rays?  They can with our Museum Grade window inserts, which we created to protect you and your space from the harmful radiation coming from the sun.

windows block uv rays
windows block uv rays

How to block UV rays through your window without replacing them

The sun is the reason we slather on sunblock, right? Summer sun can damage more than your skin. UV radiation goes right through your windows to fade furniture, wood floors, artwork and rugs, causing lasting damage to expensive materials. A single-pane window lets in 90 percent of UV radiation and a standard double-pane window lets in over 80 percent.

Museum Grade window inserts block 98 percent of the ultraviolet radiation from damaging your belongings through your windows.


So what is UV light anyway?

The sun’s energy has three parts: ultraviolet radiation, visible light (think rainbow), and infrared radiation. Ultraviolet radiation is invisible to the human eye and has the shortest wavelength of the three types. It can break down the chemical bonds present in dyes and plays a large role in changing the color of wood floors or fading fabrics and artwork.

windows block uv rays

How have you proven Indow window inserts block UV rays?

The owner of a Case Study house, homes commissioned by Art & Architecture Magazine after WW II, used Indow inserts in the clerestory windows without curtains to help protect artwork from fading. We’re in #26 and thrilled to be there.

Our inserts have gone in everywhere from the Homewood Museum on Johns Hopkins University campus to a family home in Hickory Creek, Texas where the sun was doing its worst to the artwork and leather furniture.

So, to answer your question: Do Windows Block UV Rays? Yes they can – with Indow window inserts.


Interested in protecting artwork from sunlight, or wonder how that’s been implemented before? Read this case study and Marla Yorston’s story about her Hickory Creek home in Dallas.