Standard Attic Insulation Thickness

Cellulose blown wall 3 8 3 9.

Standard attic insulation thickness.

5 1 2 inches two by six 2x6 stud walls. Mineral wool blown wall 3 1 4 0. 3 1 2 inches two by four 2x4 stud walls with true 4 inch depth. The fiberglass comes in rolls also known as batts which vary in size.

The thickness of your r 38 insulation will depend on the material you have the brand and how it s installed. Measure the depth of your current insulation. R 38 is the industry standard and the minimum thickness for r 38 is 12 inches. Sometimes people put enough insulation in the middle of the attic but very little along the eaves.

Existing 3 4 inches of insulation. They take account of all relevant parameters which makes it possible to obtain very accurate results. Mineral wool blown attic 3 1 4 0. An r 38 fiberglass batt should be approximately 12 inches thick while the thickness of cellulose insulation of a finished fitted product will larger.

Recommended insulation levels for retrofitting existing wood framed buildings. As a general rule of thumb you need to reach an insulation r value of r 38 and add between 10 and 14 inches of insulation. Loose fill insulation made from either cellulose fiberglass sheep s wool or mineral wool is typically blown in place behind existing walls or in attics. Cellulose blown attic 3 2 3 7.

Inspecting your attic insulation. Add insulation to attic. Find your zone on the map and then use the chart to determine the level of insulation you need to properly insulate your attic walls floors and crawlspaces. First things first you need to go up into your attic inspect the condition of the insulation and calculate the current level of insulation.

We offer advanced methods to calculate the optimum insulation thickness for projects in construction and industry. 3 1 2 inches two by four 2x4 stud walls. 6 1 4 inches two by six 2x6 stud walls. Appropriate for this wall type.

These materials can provide r values. Achieving greater r values in attics the higher the r value the better the thermal performance of the insulation. Measure the area needing insulation. But the attic insulation thickness depends on the material you use.

Our online calculation tools stand out from some of the others.