Loft: Attic Insulation Calc
How much attic insulation do you need? Energy Star zone targets, honest bag counts, and the rent-or-hire verdict — every rule cited.
What it does
Loft answers the attic questions. The R-Value Check and Insulate Safe are free forever: pick your climate zone, measure the inches actually up there today (blown insulation settles — Loft asks for today's number), and get an honest estimate against the Energy Star cost-effective target, R30 to R60 by zone. The safety floor never goes behind the paywall: the EPA vermiculite hard stop, IC-rated recessed lights, knob-and-tube wiring, soffit baffles, bath-fan ducting, and air-seal-first.
It also carries the chart truth: per the FTC R-value Rule, every package of insulation must state its coverage — R-value marketing earned itself a federal rule. Loft's numbers are planning norms and say so; the chart on the bag outranks any calculator, including this one.
Loft Pro — one-time unlock
$6.99, once. Coverage: attic square feet and the R you still need become the bag count for blown-in or the package count for batts. Cost & Payback: materials cost plus a rough yearly-savings band built on EPA/Energy Star's ~15% average — always a band, never a promise. Rent or Hire: rented blower, DIY batts, or a pro — the straight verdict, with hard stops no toggle can soften. No subscription, no ads, no account.
Privacy
Loft collects nothing. No analytics, no accounts, no cloud. Privacy policy · Support