Knauf Ecobatt R-21 HD Unfaced Fiberglass Insulation Batts
Best price now
$513.00at MyHackerTechObserved at 3:54 PM
Compared across 2 stores. Prices are checked against each store and labelled with when.
Compared across 2 stores. Prices are checked against each store and labelled with when.
It checks today's price at every store, compares the alternatives and answers in about a minute.
Knauf Ecobatt R-21 HD is unfaced fiberglass batt insulation for walls, floors and ceilings that need about R-21, such as 2x6 exterior walls. The batts are compression-packed, so a bag expands to cover more area than its box suggests, and the glass is formaldehyde-free and GREENGUARD certified for indoor air quality. The best new price is $513.00 at MyHackerTech as of November 4, 2026, with two stores selling it new; that is the only current price point to judge against, so compare per square foot before buying.
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Lowest price we've seen: $126.69 on Nov 4 at Moscow & Pullman Building Supply. Tracked across 6 stores since Nov 4.
Owner feedback on Ecobatt batts is generally positive on fit and low odor, with complaints centered on dust and how much the compressed packs fluff up.
