How to measure a wall for board and batten

Label the sketch before taking dimensions

Draw the wall as if you were standing directly in front of it. Give it a name, identify the left and right stops, and mark the left stop as zero. A stop might be a room corner, the edge of a cabinet, or existing trim. Write down which edge you mean; a dimension is only useful when you can find both ends again.

Use a tape that reaches the whole span without moving its starting point. On the same sketch, identify the finished floor reference used for vertical measurements. Keep these wall references even if the battens themselves start above a baseboard.

1. Wall width: left stop to right stop, including the part occupied by a window when the pattern continues across it.
2. Opening left: the distance from wall zero to the outside left edge of the window or door casing.
3. Opening bottom: the distance from your finished floor reference to the outside bottom trim edge.
4. Opening width and height: the full outside trim rectangle, measured independently of its position.
5. Batten face and finished length: the visible width of the material and the distance between its intended end stops, recorded as two different dimensions.

In the worked example, compare the window’s left offset with its width in the measurement list. One tells the calculator where the opening starts; the other tells it how far the opening extends. Follow both arrows in the diagram before entering your own readings. The return wall has its own zero, so its marks start again at that wall’s left boundary.

Check the wall at the heights the finish uses

Take width readings near the bottom and top of the proposed batten run, then check between them. Label the height of each reading. If they disagree, remeasure before choosing the dimension for the rectangular plan. Do not average the numbers and discard the evidence of a taper: the end pieces still have to meet the real wall.

Now mark the lower and upper stops for a vertical batten. With an existing baseboard and a new top rail, those stops may be the top of the baseboard and the underside of the rail. Measure between them for the finished batten length. Measuring from the floor to the top of the rail would include pieces that the batten does not occupy.

Record the whole wall height separately so the preview can show the treatment in proportion. The three useful vertical readings are the wall height, the batten’s starting height above the wall reference, and the batten’s own length. Keeping them separate makes it much easier to revise the top line without losing the original measurements. Uneven floors or trim still require local fitting; check the intended top line with a level before cutting a batch.

Measure the material you will install

Place a sample batten against the wall and measure across its visible face. Use that measurement rather than the nominal board name on the shelf label. A wider face occupies more of the wall, leaving less space between battens at the same count. If you later choose a different profile, recalculate before using the old marks.

Put the sample beside the baseboard and casing too. Its thickness affects how those junctions meet, even though face width is the dimension used for spacing. Record the profile and thickness so the material list refers to the piece you actually intend to buy.

When you reach purchasing, enter available stock lengths, saw kerf and end trimming as well as any planned spare material. A board whose nominal length matches the finished batten may leave no room to trim its ends. An overlong piece needs suitable stock or a separately resolved, supported joint; reducing its required length would only make the drawing wrong.

Choose how the pattern meets openings

If the vertical lines should continue above and below a window, keep the full wall width. Enter the outside casing as an opening so the intersecting portions of the battens stop at that boundary. Measuring the glass or the jamb instead would leave the casing unaccounted for. Record any extra clearance separately from the measured trim, so you can distinguish what exists from what you have chosen to leave open.

You can also restart the pattern beside an opening. In that case, inspect the separate spans on each side rather than subtracting the window width and treating the remainder as one long wall. An off-center window leaves different spans, so equal spacing within each span may produce different gaps on the two sides.

Add each physical opening once. If two measured exclusion areas overlap, their overlap is still only one area of wall to avoid. Check the outline in the drawing against your sketch, especially where trim projects beyond the main opening. For a narrow space beside casing, compare layouts before committing to a difficult junction.

Check a few positions before marking the whole wall

Open the worked example, replace its dimensions, and compare the drawing with your sketch. Before laying out every piece, transfer a small set of positions that can expose a wrong starting edge or opening measurement.

• Measure the first, middle, last and opening-adjacent batten positions from the same wall zero. Check whether the list labels an edge or a center before placing the mark.
• Hold the full-width material at a position beside the casing. A centerline alone can hide an overlap at the batten’s edge.
• Match the wall and opening names on the printed sheet to the sketch. A return wall starts its own set of measurements.
• If a check disagrees, find the changed measurement or reference and update the plan. Moving only the final batten would disguise the error and change the adjacent gap.

Choose a batten count and understand the spacing →