Emergency Roof Tarp Calculator

Calculate emergency tarp size (1.5× damage area), number of tarps from standard sizes, sandbags, and furring strip attachment

Quick Estimate
ft
ft
x
Coverage Needed (with overlap)
450.0
Tarps Needed1
Sandbags Needed (every 2 ft)43
2×4 Furring Strips (8 ft)21
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Extended mode adds scenarios, charts, and detailed breakdowns
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How to Use the Emergency Roof Tarp Calculator

Catching roof problems early prevents minor repairs from becoming major replacements. The Emergency Roof Tarp Calculator helps you quantify the scope and cost of maintenance or repair work.

Tip: Start with the Quick calculator for a fast estimate. Switch to Extended mode for scenario comparison and charts, or Professional mode for complete parameter control.

Formula & Methodology

The Emergency Roof Tarp Calculator uses the following established formulas:

Repair Area (sq ft) = Length × Width of damaged section Shingles Needed = Repair Area / Coverage per bundle Repair Cost = (Material + Labor) per sq ft × Repair Area Remaining Life (%) = (Expected Life − Current Age) / Expected Life × 100

If repair cost exceeds 30 % of replacement cost and the roof is more than 15 years old, replacement is usually the better investment.

Frequently Asked Questions

Start in the attic with a flashlight on a dry day. Look for water stains, mold, or daylight. Leaks often originate at penetrations (chimneys, vents, skylights) and valleys — areas where two roof planes meet. The leak entry point is often uphill from the water stain you see inside.
3-tab shingles last 15–20 years. Architectural (dimensional) shingles last 25–30 years. Premium designer shingles can last 30–50 years. Actual lifespan depends heavily on ventilation, climate, maintenance, and installation quality.
Repair if the roof is under 15 years old and damage is isolated to less than 30 % of the surface. Replace if the roof is near end of life, damage is widespread, or repairs would cost more than 30 % of full replacement. A professional inspection gives you the clearest picture.

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Sources & References

The formulas, code requirements, and reference data used in this calculator are sourced from the following authoritative organizations and publications. Local codes vary — always verify with your jurisdiction's building department.

Disclaimer: Calculator results are estimates intended for planning and educational purposes only. They do not replace professional engineering analysis, building permit review, or contractor estimates. Always consult a licensed roofing contractor or structural engineer for final specifications.