How Thick Should Insulation Be For Attic Walls

Recommended insulation levels for retrofitting existing wood framed buildings.

How thick should insulation be for attic walls. 3 1 2 inches two by four 2x4 stud walls with true 4 inch depth. This flexible insulation material is most often packaged in rolls that come in various thicknesses and standard widths usually 16 inches and 24 inches to fit between joists or studs in a house s framing. Existing 3 4 inches of insulation. The insulation in your attic should be at least 12 thick.

Add insulation to attic. The thicker the better. Inspecting your attic insulation. R 38 high performance batts are 10 to 10 1 4 thick as opposed to standard r 38 fiberglass insulation batts of 12.

You d need a thickness of. Appropriate for this wall type. It is not uncommon to see 15 to 20 of insulation in a well insulated attic. Because high performance batts achieve the same r value as standard insulation and are not as thick they need not be compressed to fit the angles and spaces typically found in cathedral ceilings.

3 1 2 inches two by four 2x4 stud walls. They come with or without a paper or foil facing that acts as a vapor barrier. R 38 is the industry standard and the minimum thickness for r 38 is 12 inches. Measure the length and width of the area you need to insulate.

If your current insulation is only five inches deep you will need to add seven inches of insulation to achieve the 12 inch r 38 rating. 3 1 2 inches two by four 2x4 stud walls. When blown into attics and wall spaces loose fill fiberglass offers an average r 2 5 thermal value per inch the higher the number the greater the insulating effect. Measure the area needing insulation.

Achieving greater r values in attics the higher the r value the better the thermal performance of the insulation. First things first you need to go up into your attic inspect the condition of the insulation and calculate the current level of insulation. 6 1 4 inches two by six 2x6 stud walls. Best insulation for 2x4 and 2x6 wall studs.