Attic Insulation Cost Calculator

ANA›Life Services Authority›National Calculator Authority›Attic Insulation Cost Calculator

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Attic Insulation Cost Calculator

Estimate the total cost to insulate your attic based on square footage, insulation type, current R-value, and desired R-value.

Attic Area (sq ft)

Insulation Type

Fiberglass Batt Blown-In Fiberglass Blown-In Cellulose Spray Foam (Open-Cell) Spray Foam (Closed-Cell) Mineral Wool Batt

Current R-Value (0 if none)

Desired R-Value

R-30 (Warm climates) R-38 (Mixed climates – DOE recommended) R-49 (Cold climates) R-60 (Very cold / extreme climates)

Include Professional Labor?

Yes – Professional Installation No – DIY Installation

Remove Existing Insulation?

No Yes – Add Removal Cost

Calculate Cost

function attCalc() { // --- Read inputs --- var area = parseFloat(document.getElementById('att-area').value); var insType = document.getElementById('att-insulation-type').value; var currentR = parseFloat(document.getElementById('att-current-r').value); var desiredR = parseFloat(document.getElementById('att-desired-r').value); var labor = document.getElementById('att-labor').value; var removal = document.getElementById('att-removal').value; var resultDiv = document.getElementById('att-result');

// --- Validation --- if (isNaN(area) || area 10000) { resultDiv.style.display = 'block'; resultDiv.innerHTML = '⚠ Please enter a valid attic area between 50 and 10,000 sq ft.'; return; } if (isNaN(currentR) || currentR 100) { resultDiv.style.display = 'block'; resultDiv.innerHTML = '⚠ Please enter a valid current R-value between 0 and 100.'; return; } if (currentR >= desiredR) { resultDiv.style.display = 'block'; resultDiv.innerHTML = '⚠ Your current R-value already meets or exceeds the desired R-value. No additional insulation needed.'; return; }

// --- Insulation data table --- // rPerInch: R-value per inch of thickness // matCostPerSqFt: material cost per sq ft per inch of thickness ($/sq ft/inch) // laborCostPerSqFt: professional labor cost per sq ft (flat, covers full job) // diyCostPerSqFt: DIY material-only cost per sq ft per inch var insulationData = { fiberglass_batt: { rPerInch: 3.2, matCostPerSqFtPerInch: 0.10, laborCostPerSqFt: 0.50, name: "Fiberglass Batt" }, blown_fiberglass: { rPerInch: 2.5, matCostPerSqFtPerInch: 0.07, laborCostPerSqFt: 0.55, name: "Blown-In Fiberglass" }, blown_cellulose: { rPerInch: 3.7, matCostPerSqFtPerInch: 0.06, laborCostPerSqFt: 0.50, name: "Blown-In Cellulose" }, spray_foam_open: { rPerInch: 3.7, matCostPerSqFtPerInch: 0.44, laborCostPerSqFt: 1.20, name: "Spray Foam (Open-Cell)" }, spray_foam_closed: { rPerInch: 6.5, matCostPerSqFtPerInch: 0.95, laborCostPerSqFt: 1.80, name: "Spray Foam (Closed-Cell)" }, mineral_wool: { rPerInch: 3.3, matCostPerSqFtPerInch: 0.18, laborCostPerSqFt: 0.65, name: "Mineral Wool Batt" } };

var data = insulationData[insType];

// --- Core Formula --- // Additional R-value needed var additionalR = desiredR - currentR;

// Inches of insulation needed = additionalR / rPerInch var inchesNeeded = additionalR / data.rPerInch;

// Material cost = area * inchesNeeded * matCostPerSqFtPerInch var materialCost = area * inchesNeeded * data.matCostPerSqFtPerInch;

// Labor cost (professional only) = area * laborCostPerSqFt var laborCost = 0; if (labor === 'yes') { laborCost = area * data.laborCostPerSqFt; }

// Removal cost = $1.50/sq ft if selected (industry average) var removalCost = 0; if (removal === 'yes') { removalCost = area * 1.50; }

// Total cost var totalCost = materialCost + laborCost + removalCost;

// Cost per sq ft var costPerSqFt = totalCost / area;

// Estimated energy savings per year (rough estimate) // Rule of thumb: upgrading from R-11 to R-38 saves ~15% on heating/cooling // Average US home energy bill ~$2,200/yr, attic accounts for ~25% of heat loss // Savings % = (additionalR / desiredR) * 0.25 * 0.15 * 2200 (simplified) var annualSavings = (additionalR / desiredR) * 0.25 * 2200; var paybackYears = annualSavings > 0 ? (totalCost / annualSavings) : 0;

// --- Format output --- resultDiv.style.display = 'block'; resultDiv.innerHTML = '### 🏠 Attic Insulation Cost Estimate ' + '' + 'Insulation Type' + data.name + '' + 'Attic Area' + area.toLocaleString() + ' sq ft' + 'R-Value AddedR-' + currentR + ' → R-' + desiredR + ' (+' + additionalR + ')' + 'Thickness Needed' + inchesNeeded.toFixed(1) + ' inches' + 'Material Cost$' + materialCost.toFixed(2) + '' + (labor === 'yes' ? 'Labor Cost$' + laborCost.toFixed(2) + '' : '') + (removal === 'yes' ? 'Removal Cost$' + removalCost.toFixed(2) + '' : '') + 'Total Estimated Cost$' + totalCost.toFixed(2) + '' + 'Cost per Sq Ft$' + costPerSqFt.toFixed(2) + ' / sq ft' + 'Est. Annual Energy Savings~$' + annualSavings.toFixed(0) + ' / year' + 'Est. Payback Period' + (paybackYears > 0 ? '~' + paybackYears.toFixed(1) + ' years' : 'N/A') + '' + '' + 'ℹ Costs are national averages. Prices vary by region, contractor, and material availability. Get 3 quotes for accuracy.

'; }

#### Formulas Used

Additional R-Value Needed: ΔR = Rdesired − Rcurrent

Insulation Thickness Required: Inches = ΔR ÷ R-value per inch of chosen material

Material Cost: Material Cost ($) = Area (sq ft) × Inches Needed × Material Cost per sq ft per inch

Labor Cost (Professional): Labor Cost ($) = Area (sq ft) × Labor Rate ($/sq ft)

Removal Cost (if applicable): Removal Cost ($) = Area (sq ft) × $1.50/sq ft

Total Cost: Total ($) = Material Cost + Labor Cost + Removal Cost

Estimated Annual Energy Savings: Savings ≈ (ΔR ÷ Rdesired) × 25% heat loss factor × $2,200 avg annual energy bill

Payback Period: Payback (years) = Total Cost ÷ Annual Energy Savings

#### Assumptions & References

More Calculators

References

Related Authorities

Life Services Authority › Professional Services Authority › Trade Services Authority › United States Authority ›