Les saisies utilisent les unités américaines (ft/in/lb et USD) ; les équivalents métriques sont affichés lorsqu’ils sont disponibles.
Calculez sacs, valeur R et coûts avec crédit potentiel à vérifier.
Insulation Details
Including installation
Target R-Value—
Bags/Rouleaux nécessaires—
Coût total—
Crédit fédéral potentiel (à vérifier)—
Coût net After Credit—
Comment calculer Insulation
Formule : Determine target R-value by climate zone and location. Calculate area. Divide by coverage per bag/roll at target R-value (check product label).
R-Value Recommendations
Zone climatique
Attic
Wall (2×4)
Wall (2×6)
Floor
1-2 (FL, TX, AZ)
R-30
R-13
R-21
R-13
3-4 (CA, GA, TN)
R-38
R-13
R-21
R-19
5-6 (NY, IL, WA)
R-49
R-13
R-21
R-25
7-8 (MN, AK, ND)
R-60
R-13
R-21
R-30
Insulation Type Comparison
Type
R/inch
$/sq ft (installed)
Best For
Fiberglass batt
R-3.2
$0.80-1.50
Walls, DIY
Blown fiberglass
R-2.5
$1.00-2.00
Attics
Cellulose
R-3.7
$1.20-2.50
Attics, dense walls
Spray foam
R-5-6
$1.50-3.50
Air sealing, premium
FAQ
What R-value do I need?
Attic: R-30 (warm) to R-60 (cold). Walls: R-13 (2×4) or R-21 (2×6). Check DOE climate zone map.
How many bags pour 1,000 sq ft attic?
At R-49: ~20-25 bags of blown fiberglass (coverage varies by product). Check bag label.
Tax credit pour insulation?
Eligibility and limits depend on current IRS rules; verify before relying on this estimate.
Can I install over existing insulation?
Yes pour attics (add unfaced batts or blown-in perpendicular). Never add faced insulation over existing faced insulation (moisture trap).