How much insulation do I need in my attic calculator?

It’s important to have the right amount of insulation in your attic to keep it warm and comfortable, and to avoid wasting money on inefficient heating and cooling. The amount of insulation needed in your attic depends on several factors, including the size of your attic, the type of roof and exterior climate, and the construction of the attic and the materials it’s made of.

How much insulation for my attic?

This calculator will determine the amount of insulation needed in your attic based on your home’s size and the average temperature of the region you live in. The amount of insulation needed in an unfinished attic is usually based on the R-value, or the amount of resistance to heat transfer.

How much insulation to put in an attic?

The average attic in a home may need between 10 and 20 percent — that’s a space about the size of a walk-in closet. If you have older materials, you may need more insulation, especially if you live in a cold climate. You can measure the thickness of the insulation on your own or by getting a professional evaluation. If you’re unsure how much insulation to add, don’t add more than 10 percent more than you have now.

How much insulation do I need in a crawl space?

There will be varying amounts of insulation needed in a crawl space, depending on the temperatures where you live and how much air leakage you have. Cooler temperatures means less insulation is needed. However, if you live in a humid area, you’ll need to add more insulation to prevent moisture from building up.

How much insulation do I need in my attic?

The amount of insulation needed in your attic depends on a variety of factors. One of the main variables is the thermal conductivity of the insulation. Insulation with lower thermal conductivity values will retain more of the thermal energy that enters your home and will keep warm air in your attic while keeping cool air down. The higher the thermal conductivity rating of your insulation, the more heat will transfer through it and the less efficient your attic will be.