Many designers admire the sleek aesthetics of a mitered corner when using wood siding. However, a year ago, I found myself apprehensive when architects requested horizontal mitered outside corners for rain screen siding and sought my advice on the best approach. Why the anxiety? We take great pleasure in satisfying our clients, and a mitered horizontal wood outside corner on exterior siding can exhibit unpredictable behavior. But that’s a thing of the past.

Why the concern? Wood is a living material, and the end grain of wood siding is its most susceptible part. When exposed to harsh external weather conditions, various issues may arise, including cupping, end-checking, warping, and splitting. Although we can’t defy the forces of nature indefinitely, there are techniques that can enhance the performance and longevity of rain screen siding outside corners.

Field Mitered Horizontal Outside Corner

To address the natural movement of wood rain screen corners during acclimation and beyond, many knowledgeable designers, woodworkers, and master craftsmen employ various techniques to create a more reliable mitered outside corner joint. Some of the best methods for achieving a field-mitered horizontal outside corner on wood siding include the use of a quirk miter (which blunts the exposed end of the siding for a more forgiving visual line at the joint), placing screws as close to the board’s end as possible to limit movement, and concealing the screw heads with matching wood.

Expertly installed field-mitered horizontal outside corner for rain screen siding (with quirk miter detail) ensures the best performance possible. However, despite the best intentions and practices of professional designers, carpenters, and craftsmen, some of these wood corners may exhibit minor movement over time and prolonged exposure. If necessary, minor repairs and maintenance can address any issues.

Climate-Shield® Horizontal Outside Corner

Now, a new and significantly improved horizontal mitered wood siding option is available. After extensive field testing, Climate-Shield introduces its innovative horizontal wood outside corner, surpassing traditional field mitered corners. It offers exceptional durability, quick on-site assembly, and a price point comparable to field-mitered corners. What’s not to appreciate about this superior corner option?

Advantages of the Climate-Shield Horizontal Outside Corner

  • Provides a long-lasting, reliable joint
  • Precision mitering creates an instantly appealing look
  • Safeguards the vulnerable end grain of wood siding
  • Assembles quickly on-site
  • Saves time and labor during installation
  • Accelerates the construction cycle
  • Offered at a similar price point as field-mitered corners
  • Minimizes the potential for cupping and end checking
  • Eliminates the need to replace ‘popped plugs’
  • Reduces the likelihood of job site callbacks
  • Leaves everyone satisfied

Thanks to Climate-Shield, I’m now enjoying more peaceful nights, and you can too.