Blown Attic Insulation R Value Per Inch

The r value of loose fill cellulose is r 3 2 to 3 8 per inch2.

Blown attic insulation r value per inch.

The total r value of installed insulation is calculated by multiplying its baseline r value times the depth of the insulation in inches. In comparison an inch of blown fiberglass insulation has an r value of 3 1 3 4 and an inch of blown cellulose in an attic has an r value of 3 2 3 7. Achieving the desired r value depends on both the depth of the insulation and its density. Input length width and desired r value of the area to be insulated.

As you can see there s some variation in r value depending on the particular type and brand of products used. R value of insulation by type. Along with knowing the r value of a particular insulation it is also important to calculate the r value of a total system. The surface burning characteristics of ecotouch insulation were derived from products tested in accordance with astm e84.

When determining how much insulation you need don t guesstimate calculate. Know exactly how much you need with our project calculators. The higher the r value the greater the insulation performance. Input depth of existing blown in insulation in inches.

As a benchmark one inch of solid wood has an r value of 1. Loose fill fiberglass has an r value of r 2 2 to 2 7 per inch3. Cellulose insulation has a baseline r value of 3 8 per inch. This standard is used solely to measure and describe properties of products in response to heat and flame under controlled laboratory conditions and should not be used to describe or approve the fire hazard of materials under actual fire conditions.

While there are additional considerations such as venting and moisture problems to take into account when you insulate under floors the united states department of energy recommends an r 25 rating in cold climates and an r 11 in warmer parts of the country. This calculator is to be used as an estimating tool only. Here are the r values per inch of the most common types of insulation. Insulation depth depending on your climate energy codes require varying r values for ceiling insulation.

Click the button to calculate the depth in inches and pounds of total insulation required for this job. The r value per inch for different types of insulation varies depending on the. You can use the small pressurized cans of foam. R value measures how well certain building insulation materials can resist heat.

Some installations can yield a higher r value than traditional batt insulation for the same thickness and can fill even the smallest cavities creating an effective air barrier.