Framing Every Window and Door Opening with Precision
Window sills and headers are among the most visible trim details on any building, and they take some of the hardest wear from rain, sun, and settling over time. Diamond Resin Products manufactures 13 window sill and header profiles from high-density polyurethane in stone, sand, and acanthus texture families. These products are used extensively in residential architecture to highlight soffit corners, edges, and window and door openings, giving each opening a defined, finished frame that elevates the entire facade. Every profile is produced at the company's Fort Myers, Florida facility and ships ready to install.
Our Window Sills
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Profiles That Serve Double Duty as Sills and Headers
Window sill profiles from Diamond Resin Products work in multiple positions around an opening. Installed beneath a window, they serve as the traditional sill ledge that sheds water and provides a clean visual base. Positioned above a window or door, the same profiles function as headers that cap the opening and tie it into the surrounding wall detail. This versatility reduces the number of unique products a builder needs to source for a project and ensures a consistent look above and below every opening on the building. Stone-textured profiles make up the largest selection in the catalog, with sand and acanthus options available for projects that call for a softer surface or classical ornamentation.
Need window sills or headers for your next build?
Contact Diamond Resin Products at (239) 689-5450 or request a quote online to get started.
Resistant to the Elements That Destroy Traditional Sills
Window sills sit in a punishing position on a building envelope. They collect rainwater, absorb direct sunlight for hours, and endure freeze-thaw cycles in colder climates. Wood sills rot, concrete sills crack and stain, and precast stone sills chip at the edges over time. High-density polyurethane eliminates every one of these failure points. The closed-cell, monolithic material is impervious to moisture, will not crack from temperature changes, and resists insect damage and UV degradation. Window sills contain no VOCs and can be primed or painted with high-quality latex paint. The textured surfaces accept faux finishes as well, giving builders and designers the ability to match the sill to surrounding banding, shutters, medallions, and other exterior trim already on the project.
Frequently Asked Questions
What textures are available for window sills?
Window sills are offered in stone, sand, and acanthus texture families. Stone profiles represent the largest selection in the catalog, with sand and acanthus options available for projects that need a smoother surface or classical leaf detailing.
How do polyurethane window sills hold up against moisture compared to wood or concrete?
Wood sills absorb water and eventually rot, while concrete sills can crack, stain, and spall over time. Polyurethane is a closed-cell material that is completely impervious to moisture. It will not absorb water, swell, or deteriorate regardless of how much rain, humidity, or standing water it is exposed to.
Can window sills be cut to fit different window widths on site?
Yes. Polyurethane window sills can be cut and trimmed on site using standard carpentry tools, just like conventional lumber. This makes it easy to accommodate different window sizes and site conditions during installation.
Do window sills coordinate with other Diamond Resin Products exterior trim?
Yes. Window sills are frequently paired with shutters, banding, medallions, brackets, and other exterior elements from the Diamond Resin Products catalog. All products are manufactured from the same high-density polyurethane, so textures, finishes, and material durability are consistent across every component on the building.
What is the best way to determine which window sill profile fits my project?
Submit your CAD or PDF architectural plans to the Diamond Resin Products estimating team. They can recommend the appropriate profiles based on your window sizes, opening configurations, and overall exterior design, and provide a detailed take-off with quantities for the full project.