Roof Cleaning Frequency Calculator
ANA›Life Services Authority›National Calculator Authority›Roof Cleaning Frequency Calculator
.calc-container { max-width: 640px; margin: 2rem 0; padding: 1.5rem; background: #fff; border: 1px solid #ddd; border-radius: 8px; box-shadow: 0 1px 3px rgba(0,0,0,0.06); font-family: system-ui, -apple-system, sans-serif; } .calc-container h3 { font-family: Georgia, serif; font-size: 1.15rem; color: #1a1a1a; margin-bottom: 1rem; padding-bottom: 0.5rem; border-bottom: 2px solid var(--ac, #3d5a80); } .calc-row { display: flex; align-items: center; gap: 0.75rem; margin-bottom: 0.75rem; flex-wrap: wrap; } .calc-row label { min-width: 160px; font-size: 0.9rem; color: #333; font-weight: 500; } .calc-row input[type="number"], .calc-row select { flex: 1; min-width: 120px; max-width: 200px; padding: 0.5rem 0.6rem; border: 1px solid #ccc; border-radius: 4px; font-size: 0.9rem; font-family: system-ui, sans-serif; color: #1a1a1a; background: #fafaf8; } .calc-row input:focus, .calc-row select:focus { outline: none; border-color: var(--ac, #3d5a80); box-shadow: 0 0 0 2px rgba(26,74,138,0.12); } .calc-row .unit { font-size: 0.82rem; color: #888; min-width: 30px; } .calc-btn { display: inline-block; margin-top: 0.5rem; padding: 0.55rem 1.5rem; background: var(--ac, #3d5a80); color: #fff; border: none; border-radius: 4px; font-size: 0.9rem; font-weight: 600; cursor: pointer; font-family: system-ui, sans-serif; } .calc-btn:hover { opacity: 0.9; } .calc-result { margin-top: 1.25rem; padding: 1rem 1.25rem; background: #f0f6fc; border-left: 3px solid var(--ac, #3d5a80); border-radius: 0 6px 6px 0; display: none; } .calc-result.visible { display: block; } .calc-result-label { font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.06em; color: #666; margin-bottom: 0.25rem; } .calc-result-value { font-size: 1.6rem; font-weight: 700; color: var(--ac, #3d5a80); } .calc-result-detail { font-size: 0.85rem; color: #555; margin-top: 0.5rem; line-height: 1.5; } .calc-note { margin-top: 1rem; font-size: 0.8rem; color: #888; font-style: italic; } .calc-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 0.75rem; margin-top: 0.75rem; } .calc-grid-item { padding: 0.6rem 0.8rem; background: #f8f9fa; border-radius: 4px; border: 1px solid #eee; } .calc-grid-item .label { font-size: 0.75rem; color: #888; text-transform: uppercase; letter-spacing: 0.04em; } .calc-grid-item .value { font-size: 1.1rem; font-weight: 600; color: #1a1a1a; } @media (max-width: 720px) { .calc-row { flex-direction: column; align-items: flex-start; gap: 0.3rem; } .calc-row label { min-width: auto; } .calc-row input[type="number"], .calc-row select { max-width: 100%; width: 100%; } .calc-grid { grid-template-columns: 1fr; } } .calc-chart { margin: 1rem 0; text-align: center; } .calc-chart svg { max-width: 100%; height: auto; } .calc-chart-legend { display: flex; flex-wrap: wrap; justify-content: center; gap: 0.6rem 1.2rem; margin-top: 0.6rem; font-size: 0.8rem; color: #555; } .calc-chart-legend span { display: inline-flex; align-items: center; gap: 0.3rem; } .calc-chart-legend i { display: inline-block; width: 10px; height: 10px; border-radius: 2px; font-style: normal; } .calc-related { max-width: 640px; margin: 2rem 0 1rem; padding: 1.25rem 1.5rem; background: #f8f9fa; border: 1px solid #e8e8e8; border-radius: 8px; } .calc-related h3 { font-family: Georgia, serif; font-size: 1rem; color: #1a1a1a; margin: 0 0 0.75rem; padding-bottom: 0.4rem; border-bottom: 2px solid var(--ac, #3d5a80); } .calc-related-list { list-style: none; padding: 0; margin: 0 0 0.75rem; display: grid; grid-template-columns: 1fr 1fr; gap: 0.4rem 1.5rem; } .calc-related-list li a { font-size: 0.88rem; color: var(--ac, #3d5a80); text-decoration: none; } .calc-related-list li a:hover { text-decoration: underline; } .calc-browse-all { margin: 0.5rem 0 0; font-size: 0.9rem; font-weight: 600; } .calc-browse-all a { color: var(--ac, #3d5a80); text-decoration: none; } .calc-browse-all a:hover { text-decoration: underline; } @media (max-width: 720px) { .calc-related-list { grid-template-columns: 1fr; } }
Roof Cleaning Frequency Calculator
Estimate how often you should clean your roof based on your roof material, local climate, and surrounding environment.
Roof Material
Asphalt Shingles Metal Clay / Concrete Tile Wood Shake / Shingle Slate Flat / EPDM / TPO
Climate Type
Dry / Arid Temperate Humid / Subtropical Tropical / Rainforest Coastal / Salt Air
Tree / Debris Proximity
No trees nearby Few trees (30+ ft away) Moderate (10–30 ft away) Heavy overhang / dense canopy
Moss / Algae / Lichen History
No history Light / occasional growth Moderate recurring growth Heavy / persistent growth
Air Pollution / Industrial Proximity
Low (rural / suburban) Moderate (urban) High (industrial / heavy traffic)
Roof Age (years)
Calculate Cleaning Frequency
function rooCalc() { var resultDiv = document.getElementById('roo-result');
// --- Inputs --- var material = document.getElementById('roo-material').value; var climate = document.getElementById('roo-climate').value; var trees = document.getElementById('roo-trees').value; var moss = document.getElementById('roo-moss').value; var pollution = document.getElementById('roo-pollution').value; var ageVal = document.getElementById('roo-age').value.trim();
// --- Validation --- if (ageVal === '') { resultDiv.innerHTML = 'Please enter the roof age.'; resultDiv.style.display = 'block'; return; } var age = parseFloat(ageVal); if (isNaN(age) || age 100) { resultDiv.innerHTML = 'Roof age must be between 0 and 100 years.'; resultDiv.style.display = 'block'; return; }
/ * FORMULA * ------- * Base interval (months) is determined by roof material. * Each risk factor applies a multiplier that REDUCES the interval * (more risk → clean more often). * * Adjusted Interval (months) = * Base_Interval * × Climate_Factor * × Tree_Factor * × Moss_Factor * × Pollution_Factor * × Age_Factor * * All factors ≤ 1.0 (they shorten the interval). * Result is clamped to [3, 60] months. /
// Base interval by material (months between cleanings) var baseIntervals = { asphalt : 24, metal : 36, tile : 30, wood : 18, slate : 36, flat : 12 }; var base = baseIntervals[material];
// Climate factor var climateFactors = { dry : 1.00, temperate : 0.85, humid : 0.65, tropical : 0.50, coastal : 0.70 }; var cF = climateFactors[climate];
// Tree / debris factor var treeFactors = { none : 1.00, few : 0.90, moderate : 0.75, heavy : 0.55 }; var tF = treeFactors[trees];
// Moss / algae / lichen factor var mossFactors = { none : 1.00, light : 0.85, moderate : 0.65, heavy : 0.50 }; var mF = mossFactors[moss];
// Pollution factor var pollutionFactors = { low : 1.00, moderate : 0.85, high : 0.70 }; var pF = pollutionFactors[pollution];
// Age factor: older roofs need more frequent attention // ageFactor = 1.0 for age 0–5, decreasing linearly to 0.70 at age 30+ var aF; if (age = 30) { aF = 0.70; } else { aF = 1.00 - ((age - 5) / 25) * 0.30; }
// Adjusted interval var adjusted = base * cF * tF * mF * pF * aF;
// Clamp to [3, 60] months adjusted = Math.max(3, Math.min(60, adjusted));
// Round to nearest whole month var months = Math.round(adjusted);
// Convert to years + months for display var years = Math.floor(months / 12); var remMo = months % 12;
var freqStr = ''; if (years > 0 && remMo > 0) { freqStr = years + ' year' + (years > 1 ? 's' : '') + ' and ' + remMo + ' month' + (remMo > 1 ? 's' : ''); } else if (years > 0) { freqStr = years + ' year' + (years > 1 ? 's' : ''); } else { freqStr = months + ' month' + (months > 1 ? 's' : ''); }
// Urgency label var urgency, urgencyColor; if (months ' + '' + 'Roof Material' + matLabels[material] + '' + 'Base Interval' + base + ' months' + 'Climate Factor' + cF.toFixed(2) + '' + 'Tree / Debris Factor' + tF.toFixed(2) + '' + 'Moss / Algae Factor' + mF.toFixed(2) + '' + 'Pollution Factor' + pF.toFixed(2) + '' + 'Age Factor (' + age + ' yrs)' + aF.toFixed(2) + '' + 'Adjusted Interval' + adjusted.toFixed(1) + ' months → ' + months + ' months' + ''; resultDiv.style.display = 'block'; }
#### Formula
Adjusted Interval (months) = Base_Interval × Climate_Factor × Tree_Factor × Moss_Factor × Pollution_Factor × Age_Factor
Result is clamped to a minimum of 3 months and a maximum of 60 months.
Factor Values
Base Interval Asphalt 24 mo · Metal 36 mo · Tile 30 mo · Wood 18 mo · Slate 36 mo · Flat 12 mo Climate Factor Dry 1.00 · Temperate 0.85 · Humid 0.65 · Tropical 0.50 · Coastal 0.70 Tree Factor None 1.00 · Few 0.90 · Moderate 0.75 · Heavy 0.55 Moss Factor None 1.00 · Light 0.85 · Moderate 0.65 · Heavy 0.50 Pollution Factor Low 1.00 · Moderate 0.85 · High 0.70 Age Factor Age ≤ 5 yrs → 1.00; Age ≥ 30 yrs → 0.70; linear interpolation between
#### Assumptions & References
- Humid and tropical climates accelerate algae (Gloeocapsa magma), moss, and lichen growth, requiring more frequent cleaning.
- Age factor interpolates linearly: aF = 1.00 − ((age − 5) / 25) × 0.30 for ages 5–30 years.
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