05 / Method and field checks
How the board map is assembled
Each measured surface is divided into 4 ft wide courses. Horizontal courses run along the wall and, when the run is long enough, every second course starts near half a panel to shift the end joint, adjusting that start if a very short edge piece would remain. Vertical mode turns that stock length up the wall. The map clips every panel against the entered doors and windows, counts only the board-to-board edge left visible outside those openings as a field seam, and fits rectangular edge remnants into later pieces. Loose cutouts from the middle of an opening are excluded from the sheet-saving inventory.
Worked board maps
To reproduce a single-wall check in the editor, remove the loaded sample room surfaces, add one 12 ft wide × 8 ft high wall, select horizontal 4 × 8 ft sheets, set inside-corner tape to 0, and leave openings empty. Expect three whole sheets, four placed pieces, and 20 ft of visible field seams. Add a 3 ft wide × 7 ft high door with a 2 ft left offset and 0 bottom offset to inspect how the opening cuts interrupt seams without automatically removing a sheet.
In that single-wall check, the two 4 ft pieces share one stock sheet. Adding the 3 × 7 ft door at a 2 ft left offset leaves 14 ft of visible seams because the opening interrupts the horizontal joint and one end joint; the notched board can still require a full sheet.
For a 10 ft by 12 ft ceiling using horizontal 12 ft sheets, three 4 ft courses each take one 10 ft piece. The two uninterrupted course joints total 20 ft; three 2 ft by 4 ft edge remnants remain before any other surface is allocated. Those remnants are candidates for another measured piece, subject to framing and handling on site.
Check the board map against framing
Measure every wall and ceiling separately, enter opening offsets from the named surface's left and bottom, and compare the numbered sheet map with real stud or joist positions. Before cutting, mark where each proposed seam lands and reject any reused offcut that lacks approved support, orientation, or edge quality.
Before cutting the first sheet
- Check the stud or joist positions: a seam drawn by geometry is not proof that the joint has approved backing.
- Do not subtract an entire window area from a sheet order when a board still needs a notch around its frame.
- Check end-joint staggering and avoid placing a butt seam at an opening corner without an approved detail.
- Use the selected board and compound labels for fire, moisture, fastener, and finish requirements; the sample coverage rates here cannot select a wall assembly.
Drywall layout questions
Why can a door reduce tape length without reducing sheet count?
A board may still span the area around a door even though the cut-out has no drywall joint to tape. This planner leaves such notched boards in the order and removes only the seam segments hidden by the opening.
Will the offcut count guarantee a smaller order?
No. The stock fit is a rectangular first-fit plan. A remnant has to match another piece and still meet the real framing, edge, orientation, and handling rules before it can be used there. Opening-center scraps are never credited.
Where do the screw and compound allowances come from?
They are provisional area rates from the manufacturer guide cited below. The board diagram determines the net covered area and field seam tape; the selected fastening schedule and finish specification may call for a different amount.
Source and planning boundary
The 4 ft panel width and illustrative allowance of about 100 screws and 6 kg of compound per 100 sq ft follow the CGC/USG Sheetrock installation and finishing guide (source checked September 24, 2026). Its application guidance should be read alongside the actual product record. MaterialNest's sheet map uses only the dimensions and openings entered here; it cannot establish rated assemblies, correct support at seams, moisture controls, or a compliant fastening pattern. Confirm those decisions with the installer and manufacturer before committing to cuts or quantities.