How High to Flood Cut Drywall (and How to Bill It in Xactimate)
What height a flood cut should be, why the decision comes from moisture readings instead of a fixed number, and how the 2 foot, 4 foot, and full height cuts each map to a different Xactimate line item measured in linear feet.
A flood cut is normally made at 2 feet or 4 feet above the floor, and the right height is whichever line sits roughly 12 to 18 inches above the highest confirmed wet reading on the wall. No IICRC standard sets a mandatory flood cut height. ANSI/IICRC S500 treats wall material removal as a drying decision driven by moisture readings against a dry standard, the water category, and cavity contents. The height also determines which Xactimate line item applies and how the quantity gets measured, which is where most of the money on a flood cut is won or lost.
What a flood cut actually is
A flood cut is a horizontal cut across the wall that removes the bottom band of gypsum, exposing the bottom plate, the studs, and any insulation in the cavity. It is the alternative to drying the wall in place with weep holes or a cavity drying system.
Setting the height
Map the moisture before the saw comes out
Sweep the wall with a non-penetrating meter to find where the wet zone ends, then confirm the boundary with a penetrating meter just above the intended cut line. Cutting at the waterline leaves wicked moisture in the remaining sheet, and gypsum wicks well past the visible tide line.
Why 2 feet is the common default
Two feet clears the wicking on most Category 1 losses caught within a day or two, and it sits above standard receptacle box height, so the removed band contains the boxes. Cutting around outlets and cleaning the top edge is why the flood cut labor rate runs higher per unit than a plain sheet pull.
Why 4 feet shows up so often
Drywall comes 4 feet wide, so a 4 foot cut takes a full sheet width on the repair with no ripping. Four feet is also the answer when the water stood higher, when the cavity holds saturated batt insulation, or when readings above the 2 foot line will not come down.
When the wall comes out floor to ceiling
Category 3 water, standing water above roughly 2.5 feet, microbial growth on the back of the board, or a cavity that will not reach the dry standard all push toward full height removal, which is no longer a flood cut for estimating and changes the line item.
Picking the Xactimate line item
The water mitigation drywall codes split by height and by measurement unit:
- WTR DRYW: tear out wet drywall, cleanup, bag for disposal, per SF. The full height or irregular removal code.
- WTR DRYWLF: tear out, cleanup, bag, per LF, up to 2 feet tall. The standard 2 foot flood cut.
- WTR DRYW4: same work, per LF, up to 4 feet tall.
- WTR DRYWLS: Category 3 flood cut, per LF.
- WTR DRYW4S: per LF, up to 4 feet tall, Category 3.
- Adding A to a mitigation code invokes the after hours rate.
The measurement rule is what gets missed. A flood cut is billed by linear feet of wall along the cut, not square feet of removed gypsum. In a 12 by 14 room, the perimeter is 52 linear feet and a 2 foot cut pulls 104 square feet of board. Writing 104 SF against the per SF code instead of 52 LF against the flood cut code applies a rate built for pulling full sheets at working height to work that is mostly line snapping, cutting around boxes, and edge cleanup. The gap on the same physical work can exceed 100 percent. Reets Drying Academy's published code breakdown listed the Category 3 per LF flood cut at $4.65 per linear foot on a May 2021 Atlanta list.
The lines that ride along with the cut
A flood cut rarely stands alone on a scope:
- WTR BASE for baseboard removal, since the base comes off before the cut.
- WTR INS for wet insulation removal including bagging, or WTR INSC for a confined space.
- Floor protection and masking for the rooms debris travels through.
- WTR DRY for air movers and WTR DHM for dehumidifiers, per 24 hour periods, plus WTR EQ for monitoring labor. Airflow into the open cavity is the point of the cut.
- WTR GRM antimicrobial application to exposed framing where the category calls for it.
The repair side is where money gets left behind
- DRY 1/2 to hang, tape, float, and ready the replaced band for paint, per SF.
- Batt insulation replacement per SF where the cavity was opened. A 2x4 exterior wall takes R-13.
- Texture matched to the existing finish. Orange peel, knockdown, and hand texture are separate line items, none included in the hanging code.
- Sealer plus two coats of paint. A repaired band cannot be spot painted to match the wall above it, so paint is measured on the full wall height, floor to ceiling. Corner to corner is the minimum defensible unit, and continuous walls in an open room often justify the full room.
- Baseboard replacement or detach and reset.
Documenting the height so it survives review
Photograph the meter with the reading legible against the wall before the cut, then photograph the marked cut line. Log that reading at a numbered monitoring point in the drying log, and note what the cavity contained. When the cut runs above 4 feet or goes full height, put the reason in the estimate notes in one line: the reading that drove it, the category, or the cavity condition. A cut height with a reading behind it gets approved on the first pass, and one without a reading gets negotiated.
Frequently Asked Questions
How high should a flood cut be?
Cut 12 to 18 inches above the highest confirmed wet moisture reading, which usually lands at either 2 feet or 4 feet. The height is a judgment call based on meter readings, water category, and cavity contents, not a fixed rule.
Is a flood cut measured in linear feet or square feet in Xactimate?
Linear feet. Flood cut codes are priced per LF of wall along the cut, while full height or irregular drywall removal uses the per SF code. Converting a flood cut to square footage and billing it on the per SF code underprices the work.
Does IICRC S500 require a 2 foot flood cut?
No. S500 does not specify a flood cut height. It requires that affected materials reach a documented dry standard, and material removal is one method of getting there. The 2 foot convention comes from field practice and the width of a drywall sheet.
Should the whole wall be repainted after a flood cut?
In most cases, yes. A patched band cannot be feathered into an existing painted surface without a visible line, so paint is scoped on the full wall height and at minimum corner to corner. Sealer over the new board is a separate line from the finish coats.
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