How to Measure Half Round Window Trim

 How to measure aluminum half round window trim.

The picture shows all 5 measures needed to order your trim.

Depending on how you choose to mount your trim, the half round trim will accommodate mounting inside brick or over the top of your j chnnel or just covering the trim only.  If there is no wood trim above your half round window, you can cut a piece of plywood to the same circular shape or even get a piece of 3/4" foam core to attach and mount your rounded trim to. 

Do not add or subtract from your measures.  We will add a quarter of an inch to the top and bottom of the trim to ensure it fits.  Your measures should only include the area you need covered. To get the depth, sometimes, you can lay a pencil on the trim face to measure out from the window and see the outer most measure.

For help with measuring, we are available with phone support to instruct you on getting these measures.  (901) 281-2887  7 am to 7 pm Central Time Monday thru Friday.

All half round window trim will arrive to you in one piece.  The bottom ends will be longer than what you need, so these will need marked and trimmed.  We do not know what kind of window seal or mounting on a continuous window install you are doing. 

If you need a full trim unit to trim the entire window, sides and bottom, we can make that too.  We will ask for more measures.

Eliptical windows.  Yes, we do those too.  We require a window trim template to be mailed to Onyx Xteriors, 885 Bennett Circle, Byhalia, MS 38611.  Once we receive the template, we will contact you for any additional phone support you may need.

Exact Measure Smooth Half Round Window Trim Aluminum Exact Measure Striated Half Round Window Trim Aluminum
Exact Measure Smooth Half Round Window Trim AluminumExact Measure Striated Half Round Window Trim Aluminum

Exact Measure Smooth Half Round Aluminum Window Trim size: your size Depth: ?" Trim face: your measure Trim Depth: your measure Mount: trim exterior cover Fasteners: snaps right over existing wood trim How do I measure?

Exact Measure Striated Half Round Aluminum Window Trim size: your size Depth: ?" Trim face: your measure Trim Depth: your measure Mount: trim exterior cover Fasteners: snaps right over existing wood trim Striated: to match brick mold (brake buddy style) How do I measure?
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12" x 24" In Brick Smooth Half Round Window Trim Aluminum 12" x 24" Over J Channel Smooth Half Round Window Trim Aluminum
12" x 24" In Brick Smooth Half Round Window Trim Aluminum12" x 24" Over J Channel Smooth Half Round Window Trim Aluminum

12" x 24" In Brick Smooth Half Round Window Trim Aluminum size: 12" height x 24" width Depth: 1 1/2" Trim face: 2" Fits: standard 12" x 24" half round window Outer measures: 14" x 28" brick opening (can be trimmed to fit) Mount: trim exterior...

12" x 24" Over J Channel Smooth Half Round Window Trim Aluminum size: 12" height x 24" width Depth: 1 1/2" Trim face: 3 1/2" Fits: standard 12" x 24" half round window Outer measures: 15 1/2" x 31" outside siding (flanged to seal) Mount: trim...

12" x 24" Trim Only Smooth Half Round Window Trim Aluminum 12" x 24" In Brick Striated Half Round Window Trim Aluminum
12" x 24" Trim Only Smooth Half Round Window Trim Aluminum12" x 24" In Brick Striated Half Round Window Trim Aluminum

12" x 24" Trim Only Smooth Half Round Window Trim Aluminum size: 12" height x 24" width Depth: 1 1/2" Trim face: 2 1/2" Fits: standard 12" x 24" half round window Outer measures: 14 1/2" x 29" outside siding (flanged to seal) Mount: trim exterior...

12" x 24" In Brick Striated Half Round Window Trim Aluminum size: 12" height x 24" width Depth: 1 1/2" Trim face: 2" Fits: standard 12" x 24" half round window Outer measures: 14" x 28" brick opening (can be trimmed to fit) Mount: trim exterior...

12" x 24" Over J Channel Striated Half Round Window Trim 12" x 24" Trim Only Striated Half Round Window Trim Aluminum
12" x 24" Over J Channel Striated Half Round Window Trim12" x 24" Trim Only Striated Half Round Window Trim Aluminum

12" x 24" Over J Channel Striated Half Round Window Trim Aluminum size: 12" height x 24" width Depth: 1 1/2" Trim face: 3 1/2" Fits: standard 12" x 24" half round window Outer measures: 15 1/2" x 31" flanged to seal outside siding Mount: trim...

12" x 24" Trim Only Striated Half Round Window Trim Aluminum size: 12" height x 24" width Depth: 1 1/2" Trim face: 2 1/2" Fits: standard 12" x 24" half round window Outer measures: 14 1/2" x 29" flanged to seal outside siding Mount: trim exterior...

16" x 32" In Brick Smooth Half Round Window Trim Aluminum 16" x 32" Over J Channel Smooth Half Round Window Trim Aluminum
16" x 32" In Brick Smooth Half Round Window Trim Aluminum16" x 32" Over J Channel Smooth Half Round Window Trim Aluminum

16" x 32" In Brick Smooth Half Round Window Trim Aluminum size: 16" height x 32" width Depth: 1 1/2" Trim face: 2" Fits: standard 16" x 32" half round window Outer measures: 18" x 36" brick opening (can be trimmed to fit) Mount: trim exterior...

16" x 32" Over J Channel Smooth Half Round Window Trim Aluminum size: 16" height x 32" width Depth: 1 1/2" Trim face: 3 1/2" Fits: standard 16" x 32" half round window Outer measures: 19 1/2" x 39" outside siding (flanged to seal) Mount: trim...

16" x 32" Trim Only Smooth Half Round Window Trim Aluminum 16" x 32" In Brick Striated Half Round Window Trim Aluminum
16" x 32" Trim Only Smooth Half Round Window Trim Aluminum16" x 32" In Brick Striated Half Round Window Trim Aluminum

16" x 32" Trim Only Smooth Half Round Window Trim Aluminum size: 16" height x 32" width Depth: 1 1/2" Trim face: 2 1/2" Fits: standard 16" x 32" half round window Outer measures: 18 1/2" x 37" outside siding (flanged to seal) Mount: trim exterior...

16" x 32" In Brick Striated Half Round Window Trim Aluminum size: 16" height x 32" width Depth: 1 1/2" Trim face: 2" Fits: standard 16" x 32" half round window Outer measures: 18" x 36" brick opening (can be trimmed to fit) Mount: trim exterior...

16" x 32" Over J Channel Striated Half Round Window Trim 16" x 32" Trim Only Striated Half Round Window Trim Aluminum
16" x 32" Over J Channel Striated Half Round Window Trim16" x 32" Trim Only Striated Half Round Window Trim Aluminum

16" x 32" Over J Channel Striated Half Round Window Trim Aluminum size: 16" height x 32" width Depth: 1 1/2" Trim face: 3 1/2" Fits: standard 16" x 32" half round window Outer measures: 19 1/2" x 39" flanged to seal outside siding Mount: trim...

16" x 32" Trim Only Striated Half Round Window Trim Aluminum size: 16" height x 32" width Depth: 1 1/2" Trim face: 2 1/2" Fits: standard 16" x 32" half round window as Outer measures: 18 1/2" x 37" flanged to seal outside siding Mount: trim...

18" x 36" In Brick Smooth Half Round Window Trim Aluminum 18" x 36" Over J Channel Smooth Half Round Window Trim Aluminum
18" x 36" In Brick Smooth Half Round Window Trim Aluminum18" x 36" Over J Channel Smooth Half Round Window Trim Aluminum

18" x 36" In Brick Smooth Half Round Window Trim Aluminum size: 18" height x 36" width Depth: 1 1/2" Trim face: 2" Fits: standard 18" x 36" half round window Outer measures: 20" x 40" brick opening (can be trimmed to fit) Mount: trim exterior...

18" x 36" Over J Channel Smooth Half Round Window Trim Aluminum size: 18" height x 36" width Depth: 1 1/2" Trim face: 3 1/2" Fits: standard 18" x 36" half round window Outer measures: 21 1/2" x 43" outside siding (flanged to seal) Mount: trim...

18" x 36" Trim Only Smooth Half Round Window Trim Aluminum 18" x 36" In Brick Striated Half Round Window Trim Aluminum
18" x 36" Trim Only Smooth Half Round Window Trim Aluminum18" x 36" In Brick Striated Half Round Window Trim Aluminum

18" x 36" Trim Only Smooth Half Round Window Trim Aluminum size: 18" height x 36" width Depth: 1 1/2" Trim face: 2 1/2" Fits: standard 18" x 36" half round window Outer measures: 20 1/2" x 41" outside siding (flanged to seal) Mount: trim exterior...

18" x 36" In Brick Striated Half Round Window Trim Aluminum size: 18" height x 36" width Depth: 1 1/2" Trim face: 2" Fits: standard 18" x 36" half round window Outer measures: 20" x 40" brick opening (can be trimmed to fit) Mount: trim exterior...

18" x 36" Over J Channel Striated Half Round Window Trim 18" x 36" Trim Only Striated Half Round Window Trim Aluminum
18" x 36" Over J Channel Striated Half Round Window Trim18" x 36" Trim Only Striated Half Round Window Trim Aluminum

18" x 36" Over J Channel Striated Half Round Window Trim Aluminum size: 18" height x 36" width Depth: 1 1/2" Trim face: 3 1/2" Fits: standard 18" x 36" half round window Outer measures: 21 1/2" x 43" flanged to seal outside siding Mount: trim...

18" x 36" Trim Only Striated Half Round Window Trim Aluminum size: 18" height x 36" width Depth: 1 1/2" Trim face: 2 1/2" Fits: standard 18" x 36" half round window Outer measures: 20 1/2" x 41" flanged to seal outside siding Mount: trim exterior...

24" x 48" In Brick Smooth Half Round Window Trim Aluminum 24" x 48" Over J Channel Smooth Half Round Window Trim Aluminum
24" x 48" In Brick Smooth Half Round Window Trim Aluminum24" x 48" Over J Channel Smooth Half Round Window Trim Aluminum

24" x 48" In Brick Smooth Half Round Window Trim Aluminum size: 24" height x 48" width Depth: 1 1/2" Trim face: 2" Fits: standard 24" x 48" half round window Outer measures: 26" x 52" brick opening (can be trimmed to fit) Mount: trim exterior...

24" x 48" Over J Channel Smooth Half Round Window Trim Aluminum size: 24" height x 48" width Depth: 1 1/2" Trim face: 3 1/2" Fits: standard 24" x 48" half round window Outer measures: 27 1/2" x 55" outside siding (flanged to seal) Mount: trim...

24" x 48" Trim Only Smooth Half Round Window Trim Aluminum 24" x 48" In Brick Striated Half Round Window Trim Aluminum
24" x 48" Trim Only Smooth Half Round Window Trim Aluminum24" x 48" In Brick Striated Half Round Window Trim Aluminum

24" x 48" Trim Only Smooth Half Round Window Trim Aluminum size: 24" height x 48" width Depth: 1 1/2" Trim face: 2 1/2" Fits: standard 24" x 48" half round window Outer measures: 26 1/2" x 53" outside siding (flanged to seal) Mount: trim exterior...

24" x 48" In Brick Striated Half Round Window Trim Aluminum size: 24" height x 48" width Depth: 1 1/2" Trim face: 2" Fits: standard 24" x 48" half round window Outer measures: 26" x 52" brick opening (can be trimmed to fit) Mount: trim exterior...

24" x 48" Over J Channel Striated Half Round Window Trim 24" x 48" Trim Only Striated Half Round Window Trim Aluminum
24" x 48" Over J Channel Striated Half Round Window Trim24" x 48" Trim Only Striated Half Round Window Trim Aluminum

24" x 48" Over J Channel Striated Half Round Window Trim Aluminum size: 24" height x 48" width Depth: 1 1/2" Trim face: 3 1/2" Fits: standard 24" x 48" half round window Outer measures: 27 1/2" x 55" flanged to seal outside siding Mount: trim...

24" x 48" Trim Only Striated Half Round Window Trim Aluminum size: 24" height x 48" width Depth: 1 1/2" Trim face: 2 1/2" Fits: standard 24" x 48" half round window Outer measures: 26 1/2" x 53" flanged to seal outside siding Mount: trim exterior...

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