Ice & Water Shield Calculator
Build an explicit coverage-zone layout, then see the net area, roll demand, whole-roll order and optional price status.
Part of the Roofing & Structure calculators — see all tools in this category.
Ice and water shield estimate
Turn explicit eave, valley, or full-face coverage zones into a transparent whole-roll order using your selected product dimensions and laps.
Preparing calculator controls…
| Eave strip (eave) | 1 strip × 12 m; 2 roll rows; 8 m² cut/layout waste |
|---|---|
| Ordered rolls | 2 whole rolls |
Current result
Order 2 whole ice and water shield rolls.
- Measured coverage area (net)
- 12 m²
- Installed strip length
- 12 m
- Layout demand before allowance
- 20 m
- After allowance
- 20 m
- Actual purchased stock
- 2 rolls; 20 m²
Net coverage is the entered roof area. Layout demand includes strip/row layout and end-join cut waste where enabled; allowance is then applied once, before whole-roll rounding. Purchased coverage can exceed net coverage because of side laps, end joins, cuts, allowance and stock rounding. Identical copied zones are deduplicated by policy; use a distinct key only for a separate physical area. A blank roll price is an incomplete, unpriced line—not $0.
- End joins purchase whole roll-length rows; cut waste is included in required roll length.
- Identical coverage zones are deduplicated; use distinct deduplication keys only for separate physical areas.
| Material | Net need | Order quantity |
|---|---|---|
| User-specified ice and water shield roll | 20 m² (ordered) | 20 m² (ordered) (2 packs) |
No prices entered
Cost breakdown
No prices entered. This is not a completed zero-cost estimate.
| Line | Purchased quantity / unit / basis | Pricing state | Direct price | Entered line tax |
|---|---|---|---|---|
| Ice and water shield rolls | 2 count (ordered) | Not priced | — | — |
- Direct priced subtotal
- $0.00
- Selected contingency base
- $0.00
- Contingency rate
- 0%
- Contingency amount
- $0.00
- Before-tax total
- $0.00
- Entered line tax
- $0.00
- Contingency tax (not entered)
- $0.00
- Final total unavailable — enter a price to begin the estimate
- —
Missing price categories: Ice and water shield rolls.
Cost by category
No entered prices to chart.
| Category | Cost | State |
|---|---|---|
| Ice and water shield rolls | Not priced | not-priced |
How it works and assumptions
Add each eave, valley or full-face coverage zone and select the roll width and length you are actually considering. Enter the project’s side and end laps, choose whether end joins are allowed, and add allowance only after the layout. Equal copied zones are visible and deduplicated instead of silently doubling material.
Use the Roof Waterproofing & Flashing Takeoff Guide to keep membrane zones and profile-specific trim as separate worksheets. Confirm product suitability and all installation decisions with the selected manufacturer and applicable local requirements.
Worked example
The calculator starts with an independent 12 m × 1 m strip example so you can check the two-roll round-up and duplicate-zone handling before entering a project.