What is the trim around exterior windows called?

The trim around the outside of windows on a house is commonly referred to as exterior window trim or exterior window casing. The main purpose of exterior window trim is decorative – it gives windows a finished look and can complement the style of the home. But it also serves important functional purposes like protecting the edges of the window and helping waterproof the window-wall transition area.

What Materials are Used for Exterior Window Trim?

There are several common materials used to make exterior window trim:

• Wood – Wood trim has been used for centuries and is still a popular choice today. It gives a traditional look and can be painted or stained. Common woods used include pine, cedar, and mahogany.
• Vinyl – Vinyl is a synthetic plastic material that has become a common replacement for wood trim. It is more affordable than wood and does not require painting. Vinyl comes in white and various colors.
• Aluminum – Extruded aluminum trim gives a modern, clean look. It is very durable but tends to conduct heat and cold more than other materials.
• Fiber cement – Fiber cement trim contains cement, sand, and cellulose fibers. It is moisture resistant and holds paint very well.
• Polyurethane – Polyurethane trim is made from synthetic polymers. It is lightweight, durable, and low maintenance.
• PVC – Polyvinyl chloride (PVC) trim is made from plastic resin and won’t rot or warp like wood. It is usually white but can be painted.

The most common options for residential homes are wood, vinyl, and aluminum. Wood requires regular maintenance like repainting but offers a classic appeal. Vinyl and aluminum are lower maintenance options. The choice often depends on the existing exterior materials of the home, budget, and personal preferences.

Types of Exterior Window Trim Styles

There are several common profiles, or shapes, used for exterior window trim:

• Flat trim – This basic style is a simple rectangular shape with 90 degree angle corners. It offers a minimalist, contemporary look.
• Brickmould – Brickmould trim has an L-shaped profile that creates a subtle reveal around the window. It is traditional for homes with brick or siding exteriors.
• Backband – Backband trim runs horizontally along the top and sometimes bottom of the window frame. It is usually paired with wider side trim.
• Sill trim – Sill trim is applied directly under the window sill for a finished look.
• Corner trim – Corner trim covers the corners where vertical and horizontal trim pieces meet.
• Drip cap – Drip cap trim installs above windows and doors to direct water runoff away from the window.

The trim style impacts the overall look and feel of windows. Flat trim gives a clean, modern appearance. Brickmould and backband trim lend a more traditional look. The trim style usually matches the home’s exterior architectural style and other trim details.

What are the Benefits of Exterior Window Trim?

Some key benefits of having trim around exterior windows include:

• Aesthetics – Window trim gives windows a polished, finished look and enhances the home’s curb appeal.
• Protect windows – Trim creates a weather barrier to protect window edges from water damage.
• Increase home value – Attractive exterior window trim can boost a home’s resale value.
• Versatility – Trim comes in various materials and styles to match home architecture.
• Durability – Materials like aluminum and PVC hold up well to weather with minimal maintenance.
• Customization – Trims elements like corner posts or drip caps can be added for decorative flair.
• Improved insulation – Sealants around trim reduce air flow and heat loss around windows.

Overall, attractive and well-installed exterior window trim brings aesthetic and functional value to a home. It gives windows a finished look while protecting against outdoor elements.

How is Exterior Window Trim Installed?

Installing exterior window trim is usually a multi-step process best performed by experienced contractors:

1. Prepare the surface around the window for trim installation by cleaning and making any necessary repairs.
2. Measure precisely to cut the trim pieces to size with a power miter saw.
3. Pre-drill holes for nails in the trim to prevent splitting wood or bending softer materials.
4. Apply exterior grade wood putty, caulk, or sealant to the back of the trim before pressing into place.
5. Nail the trim into the window framing using galvanized finish nails. Nails should be set and filled over.
6. Use corner trim pieces on outside corners and build up trim layers as needed for a finished look.
7. Caulk all seams and gaps to create a tight seal between the trim and wall.
8. Prime and paint the trim using high quality exterior paint or finish with exterior wood stain.

Proper surface prep and using exterior rated materials is key to create durable, long lasting trim installations. Getting clean trim lines also takes precision cutting and installation. Hiring a skilled trim carpenter or siding contractor is recommended for best results.

How Much Does Exterior Window Trim Cost?

The cost to add new exterior window trim or replace existing trim can vary quite a bit based on factors like:

• Trim material – Wood trim is generally the most expensive, while vinyl is cheaper and aluminum is the most economical.
• Trim style – More ornate or complex trim styles cost more to fabricate and install.
• Amount of trim needed – More windows equal more trim required, impacting total cost.
• Trim size – Larger trim dimensions increase material requirements.
• Contractor fees – Rates can vary based on location, experience, and demand.

On average, expect to pay around the following prices for new exterior window trim installation:

Trim Material	Cost per Linear Foot
Wood	$4 – $8
Vinyl	$2 – $3
Aluminum	$2 – $4

So for example, a typical double hung window that needed 10 linear feet of simple vinyl brickmould trim could average around $30 to $40 for materials. Adding labor costs for installation at $5 per foot would bring the total project cost to $100-$130. Costs can be higher for large picture windows requiring more extensive trim work.

Conclusion

Exterior window trim serves both form and function for homes. Trim options like brickmould, backband, corner posts, and drip caps frame windows while protecting them from weather damage. Wood provides a traditional look but vinyl and aluminum are lower maintenance alternatives. With proper installation, exterior window trim brings valuable aesthetics and enhanced weatherproofing to enhance a home’s appearance and value. Carefully measuring and precision cutting ensures properly fitted trim that looks clean and professional.