Observed arrival · 2026-10-15
Loft Insulation Calc
A no-sign-up calculator estimates how much insulation to add, including target R-value, material depth, bag or sheet quantities, and typical material cost.
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✦Pretty
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ƒJS
- For
- Homeowners estimating insulation for a DIY project
- Worth noticing
- It subtracts existing insulation from the target R-value, then uses manufacturer coverage figures to estimate bags or sheets.
Field notes
The calculation starts with target R-value minus the insulation already present, which users can report by depth and material or by known R-value. A default 10% waste allowance is included, and material quantities draw on manufacturer coverage figures. The page also links to government, ENERGY STAR, and product-data references, while cautioning that its typical retail cost estimate excludes tools and labor.
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○OpenPublic substance visible
✦PrettyNotable craft visible
●ProPolished or operationally mature
◎NicheUnusually specific use
ƒJavaScriptBrowser-side code central
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