Does ASCEND Publish a Standard Waste Percentage?

The current ASCEND technical summaries and installation resources identify panel dimensions, carton quantities, required cuts, overlaps, clearances, and installation procedures. They do not establish one manufacturer-mandated waste percentage for every building.

Waste must therefore be estimated from the actual project geometry. A contractor may use an internal percentage as an early budgeting allowance, but the final order should be tested against a panel-by-panel or elevation-by-elevation cut plan.

Start with Gross Wall Area

Measure the width and height of every rectangular wall section. Calculate triangles, trapezoids, dormers, and other shapes separately rather than forcing the entire elevation into one rough rectangle.

Keep measurements organized by elevation, profile, color, and texture. Combining every wall into one total too early hides where short pieces, angle cuts, or profile transitions will create waste.

Should Every Window and Door Be Subtracted?

Not automatically. Large garage doors, patio doors, and broad window assemblies may justify a full deduction. Small openings may not create equivalent material savings because full panels still pass above, below, or beside them and produce short offcuts.

An opening can reduce covered wall area while simultaneously increasing cutting waste. The estimator must consider both effects.

How Do You Calculate the Base Material Quantity?

How Much Does a Carton Cover?

These are nominal coverage figures before project waste. They do not guarantee that every square foot in a carton can be used on a particular elevation.

Why 7-Inch Plank Waste Is Layout-Dependent

ASCEND 7-inch Plank is installed horizontally. The current technical summary lists a plank length of 12 feet 3 inches. Wall lengths, corner locations, openings, and overlap placement determine whether the remaining piece from one cut can begin or complete another run.¹

The published lap procedure also requires the under-plank to receive a complete field cut and maintain the prescribed overlap. The estimator should not count the nominal plank length as unrestricted wall coverage without accounting for the lap detail.²

Account for the Plank Overlap

ASCEND requires a specific over-plank and under-plank procedure. The under-plank receives a straight flush cut through the nail hem and foam before being installed behind the factory overlap edge. The overlap is maintained according to the current installation guide.²

Do not calculate horizontal coverage by placing nominal panel lengths end to end with no allowance for the lap. Doing so overstates the useful run length and can leave the project short.

Why Board & Batten Waste Behaves Differently

ASCEND Board & Batten is installed vertically. Each panel has a 12-inch exposure and is 12 feet long. Unlike horizontal Plank, Board & Batten panels cannot be overlapped to create additional height.³

Panel height and wall height therefore have a major effect on waste. A wall just under 12 feet may use most of each panel efficiently. A wall substantially shorter than 12 feet creates a longer offcut from every vertical panel.

Gables Can Create Significant Waste

Gables produce changing panel lengths and angled cuts. For 7-inch Plank, separate angle patterns are created for the two roof slopes. For Board & Batten, the panel layout should be centered and balanced before panels are cut.⁴

A gable should not receive the same automatic waste assumption as a rectangular wall. Draw the panel courses or vertical panel positions and determine whether opposite-slope or progressive offcuts can be reused.

Can Window and Door Offcuts Be Reused?

Sometimes. Reuse depends on the offcut’s length, shape, factory edges, lock condition, nail hem, color, texture, and the next required cut.

Do not count every square foot removed from a window opening as reusable material. A panel cut into an L-shape or narrow strip may have substantial area on paper while providing no practical value elsewhere.

Use a Cut Map

A cut map assigns full panels and likely offcuts to specific wall locations. It forces the estimator to prove where the material will go instead of assuming every remainder can be used.

Suggested Planning Ranges

The following ranges are practical estimating starting points—not manufacturer requirements. They should be replaced by a project-specific cut analysis before ordering.

These ranges are general estimating judgments and are not published ASCEND waste factors. The correct allowance may be lower or higher after the elevations are laid out.

Example: 7-Inch Plank Estimate

The 10% allowance in this example is an estimating decision—not an ASCEND requirement. The contractor should still confirm the result against wall lengths, overlap placement, gables, openings, and carton availability.

Example: Board & Batten Estimate

Before ordering, check the panel heights and centered layout. Eleven cartons may be adequate by area but still insufficient if repeated height cuts create offcuts that cannot be reused.

Carton Rounding Can Become the Real Waste Factor

Small accent areas can produce a high percentage of apparent excess because the material must be purchased in complete cartons.

For example, a Board & Batten accent needing 100 square feet requires more than one 96-square-foot carton. Purchasing two cartons provides 192 nominal square feet even before cutting. The excess is caused primarily by packaging—not poor estimating.

Keep Profiles, Colors, and Textures Separate

Material from one profile, color, or texture cannot automatically offset a shortage in another. Calculate each combination separately.

Should Repair Stock Be Added?

Keeping a small amount of properly stored matching material can simplify a future repair. Colors, textures, product configurations, and production runs may change over the life of the home.

Repair stock should be clearly labeled and stored according to ASCEND’s published storage instructions. Do not leave unsupported panels leaning vertically in a garage or attic.⁵

Do Not Use Damaged Material to Reduce Waste

ASCEND instructs installers to inspect cladding for breakage, foreign objects, surface defects, color consistency, and correctness before installation. Questionable product should not be installed simply to keep the waste number low.⁶

Installing a damaged panel is not material efficiency. It converts visible waste into a concealed service risk.

Common ASCEND Waste-Estimating Mistakes

A Better ASCEND Takeoff Process

1. Measure each elevation separately.
2. Separate rectangles, triangles, and irregular wall sections.
3. Record every opening and decide whether it creates a legitimate deduction.
4. Separate quantities by profile, color, and texture.
5. Lay out Plank courses or Board & Batten panel positions.
6. Mark overlaps, gable cuts, openings, and finish courses.
7. Assign substantial offcuts to realistic reuse locations.
8. Calculate the unassigned loss.
9. Add a contingency appropriate to project complexity.
10. Convert adjusted area into full cartons.
11. Add any approved repair stock.
12. Have the installer or project manager review the final order.

What Should Be Recorded on the Takeoff?

How Should Contractors Explain Waste to a Customer?

The Bottom Line

ASCEND waste should be estimated from the building—not from one automatic percentage. Begin with net wall area, separate the profiles, and then analyze panel lengths, direction, overlaps, openings, gables, transitions, and realistic offcut reuse.

ASCEND 7-inch Plank is packaged with 14 planks per carton and provides approximately one square of nominal coverage. Board & Batten is packaged with eight panels and provides 0.96 square, or approximately 96 square feet, per carton.

Preliminary allowances of roughly 5% to 15% may be useful during budgeting, depending on complexity, but these are estimating judgments—not manufacturer requirements. The final order should be supported by an elevation layout, a practical cut map, and full-carton rounding.

The disciplined estimating standard is simple: do not ask only how many square feet the house has. Prove how the panels will cover it.