Worked layout
Board and batten around a window
Example measurements
- Window wall
- 120 × 96 in
- Window outside trim
- 36 × 42 in
- Left / bottom position
- 42 / 30 in
- Return wall
- 96 × 96 in
- Actual batten face
- 2½ in
- Window / return wall battens
- 7 / 6
Layout result
- Window
- 36 × 42 in
- Installed pieces
- 14
- Exact material
- 100 ft 6 in
Compare on the same wall
Compare the illustrated Window wall. The 6/7/8 cards change only its batten count; Return wall stays at six. The final two cards compare continuous alignment with three battens in each side span. Measurements and opening boundaries stay the same.
6 battens
1 ft 9 in clear width / gap · 8 pieces on Window wall
Try this variation →7 battens
≈1 ft 5 1/16 in clear width / gap · 8 pieces on Window wall
Try this variation →8 battens
≈1 ft 2 5/16 in clear width / gap · 10 pieces on Window wall
Try this variation →Keep alignment across the window
≈1 ft 5 1/16 in clear width / gap · 8 pieces on Window wall
Seven positions continue above and below the window. The return wall keeps six battens.
Try this variation →Restart beside the window
1 ft 5 1/4 in clear width / gap · 6 pieces on Window wall
Three battens in each of the two side spans; the opening column stays clear for its full height. The return wall keeps six battens.
Try this variation →Read the window as a finished exclusion
Start with the input table and locate the outside-trim rectangle in the drawing. The example’s window wall is 120 by 96 inches, with a 36-by-42-inch trim boundary positioned 42 inches from the left and 30 inches from the floor. These are casing measurements, not glass dimensions.
The 2.5-inch batten faces follow a continuous grid. Trace a line through the opening: the missing middle does not shift the pieces above and below it. Read their individual lengths in the schedule rather than ordering a full-height board for every visible fragment.
The project also includes a 96-by-96-inch return wall. It uses a separate count and its own left-edge reference. The corner members remain separate pieces; sharing a room corner does not automatically make them one purchasable member.
Compare alignment with independent side sections
Compare the neighboring-count drawings with your attention on the two casing sides. The opening stays fixed and only the window-wall count changes; the return wall retains its independent six-batten layout. Use the installed-piece figure for the displayed wall when comparing cards, and the project total when reviewing both walls.
Next inspect the short pieces above and below the window. Fewer intersections may simplify the piece list but can still leave an unattractive narrow space beside the casing. The count comparison is a way to expose that trade-off, not a ranking of universally better designs.
For a second comparison, try restarting beside the window. The fixed-count setting applies the same chosen count to each remaining span, so inspect the resulting gap on both sides. Target-gap planning instead lets you compare the counts and gaps resolved for those spans. This changes how the sides relate to the window; retain the continuous grid when the lines above and below are meant to connect visually.
Replace the window measurements before tuning clearance
Open the sample, replace wall width and height, and then enter the outside-trim position and size. Keep the wall’s lower-left reference consistent throughout. If your return wall differs, update that wall separately instead of assuming the window-wall count will describe both.
Take width readings near the head and lower trim and note any lean in the casing. Preserve those field notes when choosing the rectangular input. Place an actual batten against the head, sill and side trim to establish the intended stop detail.
Only then adjust clearance. Clearance represents a deliberate extra space outside the measured boundary. Enlarging it to make an inconvenient fragment disappear also enlarges the bare area around the window.
Resolve short pieces as specific locations
A fragment beneath the sill and one trapped above the head may have the same length but different attachment and finishing conditions. Inspect each by position. If continuation is omitted, look at the whole elevation again to make sure the break is the intended design.
Before reviewing stock, label the remaining pieces by wall and location. An offcut is useful only if its profile, finish and usable size suit that particular piece. Andersen’s rectangular flat-trim guide explains separate head, sill and side measurements for its own system; it does not supply the attachment detail for these battens.
- Check that the two casing-side spaces suit the actual trim projection.
- Mark upper and lower piece edges from the same wall reference.
- Keep the return-wall count and corner members identifiable.
- Confirm usable stock and attachment for every short piece before cutting.
Questions about this layout
Does this sample fit an off-center window?
You can change the window’s measured left offset while keeping its size. Then recalculate and inspect both casing-side spaces; the centered sample does not predict the appearance of an offset opening.
Why does the piece total differ between a comparison and the full project?
The comparison describes the displayed window wall. The complete sample includes a separate return wall as well. Check the scope named beside the total before using it for materials.
Will the return wall change when I compare window-wall counts?
The supplied comparison candidates change the window wall and retain the return wall’s independent count. When adapting the project, inspect each wall’s own result.
Sources and assumptions
- Andersen: Straight Interior Flat Trim ApplicationRectangular opening measurements at the head, sill, and sides for Andersen flat trim. Its attachment method is product-specific; it is not a mitered wood-casing cut schedule.
- TrimLayout Calculation MethodsDefinitions of clear gaps, measurement references, finished pieces, and material allowances used in these examples.
- NIST: SI Units — LengthUnit relationships for converting measured lengths; this source does not prescribe decorative proportions.