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PLATES STUDS OPENING {{ spacingLabel }}
Choose a starting pattern, then confirm every setting against the project documents.
Use the stock size that will be purchased for stud-family pieces.
Changing the unit converts the value without changing the physical length.
Confirm plate thickness and cut practice for the actual stock and assembly.
Common planning values include 300, 400, 488, and 600 mm.
Enter the number of similar rough door openings in this wall run.
Advanced contains the matching rough height assumption.
Enter the number of similar rough window openings in this wall run.
Advanced contains rough height and sill-height assumptions.
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Straight walls often need less allowance than walls with many openings, short cuts, or uncertain pickup stock.
A single top plate has specific design and connection conditions; confirm the project requirement.
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Use zero for a free-standing segment or the number of tied-in corner ends.
Two-stud adds one extra per corner end; three-stud adds two.
Adjust when your chosen backing detail uses a different material layout.
Confirm header material, size, bearing, and support from the structural design.
Set zero when only quantities are needed.
$/ board
Use the price for the horizontal stock length entered above.
$/ board
Leave zero for a pre-tax material estimate.
%
Framing plan
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Takeoff method
One canonical result feeds every summary, row, chart, and export.
boards = ceil(linear stock × (1 + waste%) ÷ stock length)
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Planning estimate only. Confirm structural design, header sizing, bracing, fastening, lumber grade/species, local code, and inspection requirements before building.

Loading the stock comparison chart…The chart renderer is unavailable. The same stock values remain available in the framing plan and cut ledger.

ComponentPiecesCut / stockPurposeCopy
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A wall-framing takeoff turns a wall elevation into pieces of lumber. The regular stud layout is only the starting point. Doors and windows remove some common studs but add full-height king studs, shorter jack studs, headers, sills, and cripple pieces. Corners and intersecting walls add more backing, while top and bottom plates consume horizontal stock.

Rough openings belong in the count, not finished door or window sizes. The header must extend beyond the opening for bearing, and the jack studs support that header. Window framing also needs a rough sill and short pieces above and below the opening. These parts make an opening-heavy wall use more lumber than its net area suggests.

MemberJob in the wallTakeoff driver
Common studRepeats along the wall at the chosen on-centre spacing.Wall length, spacing, and openings.
King and jack studsFrame the sides of a rough opening and support its header.Opening count and rough height.
CrippleFills short stud bays above a header or around a window sill.Opening width, spacing, and vertical clearances.
Plate, header, and sillProvide horizontal continuity and frame opening tops or bottoms.Wall length, plate layers, opening width, bearing, and plies.

Stock length changes the purchase count even when the wall geometry stays the same. Linear demand is divided by the selected board length only after waste is added, then rounded up to whole boards. This is useful for budgeting, but it does not optimize a cut list across offcuts or prove that every required piece fits the stock.

Stud spacing, member size, headers, bracing, fastening, fireblocking, and plate details depend on wall loads, height, openings, wind and seismic conditions, lumber grade and species, sheathing, and local code. A material estimate should be checked against the approved drawings before purchase or construction.

How to Use This Tool:

Model one straight wall run with one repeated door size and one repeated window size.

  1. Choose Wall profile as a starting pattern, then confirm the stud size, spacing, plate layers, and waste against the project documents.
  2. Enter Wall length, Finished wall height, and Stud spacing. Use the purchased stud stock length, not the nominal wall height.
  3. Enter the number and rough width of similar door and window openings. Open the additional settings for their rough heights, sill height, header depth, bearing, and plies.
  4. Set corner ends, corner method, tee intersections, horizontal stock length, waste allowance, board prices, and any tax or fee included in the estimate.
  5. Read Framing plan for quantities and cost, compare whole-board demand in Stock comparison, and check the piece lengths in Cut ledger. Correct any named input warning before using the takeoff.

Technical Details:

The calculation normalizes all lengths to metres. Finished wall height is reduced by one bottom plate plus the selected number of top-plate layers, using 38 mm actual plate thickness for each layer. Opening widths remove a bounded number of common stud positions, then dedicated opening, corner, and intersection members are added.

Formula Core:

Whole-board purchase quantities are the ceiling of waste-adjusted linear demand divided by stock length:

nbase=⌈Ls⌉+1 lstud=H−(1+ntop)×0.038 nboards=⌈llinear×(1+w100)lstock⌉ Cost=nstudpstud+nhorizontalphorizontal

L is wall length, s is stud spacing, H is finished wall height, w is waste percentage, and l represents cut or stock length in metres. Purchase counts are always whole boards. Tax or fee is calculated from the board subtotal and added afterward.

Opening and accessory rules:

  • Each door or window adds two king studs and two jack studs.
  • Door top cripples equal the opening count times the floor of rough width divided by spacing, plus one.
  • Each window uses the same bay count above and below the opening, so its bay cripples are counted twice.
  • Two-stud corners add one extra stud per entered corner end; three-stud corners add two.
  • Each tee intersection adds two studs.
  • Header length equals rough width plus bearing at both ends, multiplied by header plies.

The wall must leave more than 0.1 m of full-height stud after the selected plates. Combined rough opening widths must be less than the wall length. Door height plus header depth must fit below the stud cut; a window's sill height, rough height, and header depth must also fit.

Net wall area subtracts rectangular door and window areas from gross wall area. It is a geometric side result, not a sheathing takeoff because sheets, seams, blocking, and layout waste are not modeled.

Planning Limits:

The takeoff models quantities for a straight wall; it does not choose a compliant or structurally adequate assembly.

  • Header sizing, load paths, hold-downs, bracing, sheathing, blocking, fire stops, connectors, and fastening are outside the estimate.
  • All entered doors share one rough size, and all entered windows share one rough size.
  • Whole-board rounding does not perform cutting-stock optimization or reuse offcuts between member families.
  • Prices are entered planning values in USD and do not account for supplier packs, delivery, discounts, or price changes.

Worked Examples:

One door and one window in a 4.8 m wall

A 4.8 m by 2.4 m wall at 400 mm spacing, with one 0.91 m door, one 1.2 m window, a bottom plate, two top plates, two three-stud corner ends, and 10% waste produces a 2.286 m stud cut. The verified takeoff contains 15 full-height studs, 4 jack studs, 11 cripple pieces, and 29 boards in total. At $4.75 per stud board and $9.50 per horizontal board with no tax, the modeled cost is $171. The result remains a purchase estimate until the opening schedule and structural details are confirmed.

References: