How Much Insulation for 2000 Square Feet?
Bags or rolls
17 bags
2,000 square feet of wall or ceiling, framed at 16 inches on center, with 106.8 square foot bags.
When the figures look right, the insulation material list downloads as a real PDF with your business details on it, built inside your own browser. Nothing you type is uploaded anywhere.
How that number is worked out
These are the figures this page was built with and every line the calculator produces from them. Change anything above and all of it moves.
- Wall or ceiling area2000 sq ft
- Stud or joist spacing16 in
- Coverage per bag or roll106.8 sq ft
Bags or rolls17 bags
| Gross area | 2,000 sq ft |
|---|---|
| Framing factor at 16 in oc | 90% |
| Cavity area to insulate | 1,800 sq ft |
| Bags at 106.8 sq ft | 17 |
| Coverage bought | 1,816 sq ft |
The material list this produces
| Insulation batts, bags | 17 |
|---|---|
| Vapor retarder, sq ft (if required) | 2,000 |
Coverage per bag compared
Bag coverage is the number that decides this, and it is printed on the bag. Here is the same area at five common coverages.
| Coverage per bag | Bags or rolls | Coverage bought |
|---|---|---|
| 40 sq ft | 45 bags | 1,800 sq ft |
| 50 sq ft | 36 bags | 1,800 sq ft |
| 75 sq ft | 24 bags | 1,800 sq ft |
| 90 sq ft | 20 bags | 1,800 sq ft |
| 106.8 sq ft | 17 bags | 1,816 sq ft |
What else matters here
Two thousand square feet of framing leaves 1,800 square feet of cavity, and seventeen bags covers 1,816 square feet. Sixteen square feet of margin on a job this size is effectively none, so order eighteen.
A job this size is worth splitting by area rather than ordering as one number. Walls, ceilings and any cathedral sections usually want different R values and different batt depths, and lumping them together is how a delivery arrives with the wrong product in the right quantity.
Air sealing matters more than the last bag. Batts do nothing about air moving through a gap at a top plate or around a can light, and a carefully insulated wall with an unsealed penetration still loses heat at the penetration.
What this calculator assumes
- Framing takes up roughly 10 percent of a wall at 16 inch on center and 7 percent at 24. Cavity area is reduced accordingly, so you do not buy insulation for the studs.
- Bag coverage varies a lot by R value and width. The default is a common R-13 kraft faced batt bag; read your own bag and change it.
Questions people ask
How many bags of insulation for 2000 square feet?
Seventeen bags at 106.8 square feet per bag covers the 1,800 square feet of cavity, but with almost no margin. Eighteen is the safer order.
Why is the cavity area less than the wall area?
Because studs and plates take up part of the wall and they are not insulated. Framing runs about 10 percent of a wall at 16 inch on center and about 7 percent at 24 inch, so the calculator takes that off before dividing.
How much does one bag of batts cover?
It is printed on the bag and it moves with R value and width. The default here is a common R-13 kraft faced batt bag at 106.8 square feet. Change it to whatever you are actually buying before you trust the count.
The insulation calculator takes any dimensions you like and hands back the same list.