Attic & Roof
The attic & roof cluster: attic insulation cost, an attic bag / depth calculator to a target R, a blown-in vs batt attic compare, attic R-value by climate zone, and a cathedral / roofline insulation quantity. Coverage-per-bag at R is a labeled manufacturer chart — read your bag and blow a little deep for settling.
Planning estimate: this is a planning estimate from the numbers you enter — not a bid or a contract. Insulation pricing depends on material, R-value, access, prep, air-sealing, removal and local labor. Get itemized written quotes from licensed, insured insulation contractors before you commit.
Confirm coverage-per-bag, R-per-inch and set yield against the exact product you buy and order a little extra (~5–10%) for framing, gaps and settling. Coverage, R/inch and set yields vary by product and brand — read the bag/kit and the data sheet.
Typical published planning values — NOT a certified design. Real performance depends on installation quality, framing / thermal bridging, moisture and settling; follow the product data sheet and your local energy code. Foam ignition/thermal-barrier, vapor/moisture control and combustion-air safety are set by the manufacturer and code — check with a professional.
Attic insulation costEstimate attic insulation cost from your square footage and your own installed price per ft². Adds a contingency buffer and labeled installed price bands.Attic bag / depth calculatorFind how many bags of blown-in insulation your attic needs to hit a target R-value, and how deep to blow it, using the labeled coverage-per-bag chart.Blown-in vs batt attic compareCompare blown-in bags vs batt bundles for an attic, side by side, with your own $/bag and $/bundle for the cost columns. Free, no signup, transparent formula.Attic R-value by climate zoneLook up the labeled IECC / ENERGY STAR attic target R-value for your U.S. climate zone (R-30 to R-60) before you size bags, depth or cost. A free reference.Cathedral / roofline insulationSize cathedral / roofline insulation: the R-value a rafter cavity holds, the spray-foam board-feet, and the number of kits to buy. Transparent formula.
Every Attic & Roof tool is calculated server-side — visible immediately — with its formula, a worked example and a reference table, and works on the measurements you take and the prices you enter from your own quotes. Background reading is in the guides.