{
  "slug": "1200-sq-ft-attic-insulation-calculator",
  "title": "1200 Sq Ft Attic Insulation Calculator",
  "heading": "1200 Sq Ft Attic Insulation Calculator",
  "category": "other",
  "url": "https://www.revenuelab.fyi/toolbox/1200-sq-ft-attic-insulation-calculator",
  "summary": "Insulation bags and cost for a 1200 sq ft attic at a target R-value.",
  "description": "Attic insulation is typically sold in bags rated for a specific coverage area at a specific R-value, so the number of bags you need scales with both your attic's square footage and how much R-value you're adding. This calculator defaults to a 1,200 sq ft attic targeting R-38, converts that into bags based on your product's coverage rating, and estimates total material cost.",
  "formula": "Bags Needed = (Attic Area ÷ Coverage per Bag at Target R-value). Cost = Bags × Price per Bag.",
  "dateModified": "2026-09-06",
  "run_url": "https://www.revenuelab.fyi/api/public/calc?tool=1200-sq-ft-attic-insulation-calculator",
  "inputs": [
    {
      "id": "atticArea",
      "label": "Attic area",
      "kind": "number",
      "hint": null,
      "default": 1200,
      "unit": "sq ft",
      "min": 50,
      "max": null
    },
    {
      "id": "targetR",
      "label": "Target R-value",
      "kind": "number",
      "hint": null,
      "default": 38,
      "unit": null,
      "min": 13,
      "max": 60
    },
    {
      "id": "coveragePerBag",
      "label": "Coverage per bag at target R-value",
      "kind": "number",
      "hint": null,
      "default": 30,
      "unit": "sq ft",
      "min": 5,
      "max": null
    },
    {
      "id": "bagPrice",
      "label": "Price per bag",
      "kind": "number",
      "hint": null,
      "default": 18,
      "unit": "$",
      "min": 0,
      "max": null
    }
  ],
  "outputs": [
    {
      "id": "bags",
      "label": "Insulation bags needed",
      "format": "number",
      "hint": null,
      "primary": true
    },
    {
      "id": "cost",
      "label": "Estimated insulation cost",
      "format": "currency",
      "hint": null,
      "primary": false
    },
    {
      "id": "atticArea",
      "label": "Attic area",
      "format": "number",
      "hint": null,
      "primary": false
    }
  ],
  "worked_example": {
    "inputs": [
      "Attic area: 1200 sq ft",
      "Target R-value: 38",
      "Coverage per bag at target R-value: 30 sq ft",
      "Price per bag: 18 $"
    ],
    "outputs": [
      "Insulation bags needed: 40",
      "Estimated insulation cost: $720",
      "Attic area: 1,200"
    ]
  },
  "how_to": {
    "title": "How to use this",
    "steps": [
      "Enter attic area (sq ft).",
      "Enter target r-value.",
      "Enter coverage per bag at target r-value (sq ft).",
      "Enter price per bag ($).",
      "Read your insulation bags needed on the right — it updates as you type.",
      "Hit Share to keep the scenario or send it to someone."
    ]
  },
  "scenarios": [
    {
      "name": "Conservative",
      "description": "Lower-end numbers — what if things land soft?",
      "values": {
        "atticArea": 700,
        "targetR": 23,
        "coveragePerBag": 18,
        "bagPrice": 10.799999999999999
      }
    },
    {
      "name": "Typical",
      "description": "Defaults — the most common real-world setup.",
      "values": {
        "atticArea": 1200,
        "targetR": 38,
        "coveragePerBag": 30,
        "bagPrice": 18
      }
    },
    {
      "name": "Ambitious",
      "description": "Higher-end numbers — what if things really pop?",
      "values": {
        "atticArea": 1900,
        "targetR": 60,
        "coveragePerBag": 48,
        "bagPrice": 28.8
      }
    }
  ],
  "limitations": [
    "Estimates assume standard, average conditions — local rules, pricing, and materials vary.",
    "Results are rounded for readability; add a buffer before ordering, booking, or committing.",
    "Double-check anything with a real cost attached against a local quote."
  ],
  "faq": [
    {
      "q": "What R-value is recommended for a 1200 sq ft attic?",
      "a": "Most cold and mixed climates recommend R-38 to R-60 for attics; check your local energy code or the DOE's zone recommendations for your area."
    },
    {
      "q": "Does bag coverage change with R-value?",
      "a": "Yes, manufacturers list different coverage areas per bag for each target R-value since higher R-values need a thicker, denser layer — always check the bag label for your specific product."
    },
    {
      "q": "Should I remove old insulation before adding more?",
      "a": "Not usually — you can typically add a new layer on top of existing insulation as long as it's dry and not compressed, which is more cost-effective than full removal."
    }
  ],
  "related": [
    "https://www.revenuelab.fyi/toolbox/1500-sq-ft-flooring-calculator",
    "https://www.revenuelab.fyi/toolbox/2000-sq-ft-siding-calculator"
  ],
  "license": "CC-BY-4.0",
  "citation": "RevenueLab — 1200 Sq Ft Attic Insulation Calculator (https://www.revenuelab.fyi/toolbox/1200-sq-ft-attic-insulation-calculator)"
}