The most common form of home insulation is “Batt and Roll” or “Blanket” insulation. It is typically stored in rolls, is generally made of fiberglass and is the least expensive way to insulate a home.
Easy to Install
Batt and roll insulation is manufactured in various sizes for easy transport, and to make the installation easy for everybody from contractors to do-it-yourselfers.
Air Seal Before Insulating
Insulation helps save energy by preventing heat transfer either into or out of your home (depending on the climate). But insulation is not effective at stopping air from infiltrating through gaps and cracks in the home’s exterior shell, or envelope. Therefore, for the insulation to be effective, you must seal air leaks before adding insulation.
Higher R-Values Insulate Better
Like all insulation, batt and roll is rated on an R-Value scale, which measures the thermal resistance – the effectiveness to prevent heat transfer – of the material. The R-Value increases with the density and thickness of the insulation. A higher R-Value means better insulating properties – and a higher the cost.
The following chart shows how the thickness, R-Value and cost of the insulation rise together (note: cost is approximate and may vary by location):
| Thickness (inches) | R-Value | Cost (cents/sq. ft.)
|
| 3 ½ Inches | 11 | 12 – 16 |
| 3 5/8 Inches | 13 | 15 – 20 |
| 3 ½ Inches (High Density) | 15 | 34 – 40 |
| 6 to 6 ¼ Inches | 19 | 27 – 34 |
| 5 ¼ Inches (High Density) | 21 | 33 – 39 |
| 8 to 8 ½ Inches | 25 | 37 – 45 |
| 8 (High Density) | 30 | 45 – 49 |
| 9 ½ Standard | 30 | 39 – 43 |
| 12 | 38 | 55 – 60 |
Better Insulation Reduces Heating and Cooling Costs
While different R-Values are recommended for different climate regions, you can always benefit from installing a higher rated insulation. Although the initial cost will be greater, your home will be better insulated and require less energy for heating and cooling. A more energy efficient home may command a higher resale value and help you sell faster. Find the recommended insulation for your climate using the Department of Energy’s Zip Code Insulation Calculator.
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Might be obvious to pros.
But if you have a wall that has a inside cavity 3.5″ wide.
Only put 3.5″ (non compressed) of fiberglass insulation in that cavity.
Most bats will be the correct thickness if “WALL” is printed on the package.
If you stuff the wall thinking more is better.
You are wrong and have done the wrong thing. In terms of thermal
insulation anyway.
Insulation, fiberglass especially must have a fluffy texture. Like a pillow.
Air inside the mesh is the key factor to insulating this way.
With out the air that creates the “Fluff” in the fiberglass.
You simply don’t have thermal insulation.