Casings are the moldings that go around the window frames. They are installed outside the house to seal the window frame to the house blocking cold air from entering the interior. They generally match the same moldings used in those applications so the room has a cohesive look.Click to see full answer. Similarly, what is exterior window casing?Exterior window casing is typically not mitered. You can use the common butt-joint, and the finish work can be done with the rest of the house all at the same time. The only real concern is that the casing is installed so that it sheds water away from the window.Secondly, what trim to use for exterior windows? Fir. Fir is one of the most widely used of all the exterior trim materials. Fir is affordable, is mostly straight and in most cases, the lumber yard or store where you purchase the fir will allow you to select the pieces you want, culling out most of the twisted or warped pieces. Additionally, how wide is window casing? Standard door and window trim is typically 2 1/4 inches in width, baseboard is about 3 inches, and crown is about 4 1/2 inches. Standard measurements typically vary 1/16 inch or more.Is exterior window trim necessary? Why window trim is important Wood trim around windows performs the very important function of improving the insulation of your home’s exterior. Many homeowners will want to eventually upgrade their windows to low-e, double-pane glass in an effort to lower monthly heating and/or cooling bills.
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