How Thick Should Insulation Be In Your Attic

Your attic should have a certain amount of insulation in it and the recommended level of insulation for your attic is dependent on where you live.

How thick should insulation be in your attic. However building codes only require an r 38. Department of energy recommends r 49 attic insulation. The insulation in your attic should be at least 12 thick. Batt spray and blown.

Existing 3 4 inches of insulation. Add insulation to attic. Recommended insulation levels for retrofitting existing wood framed buildings. The thicker the better.

Achieving greater r values in attics the higher the r value the better the thermal performance of the insulation. Inspecting your attic insulation. Attic insulation is measured by an r value which indicates how insulation controls the flow of heat and cold through your home. 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.

These are large rolls of insulation that are easy to cut into usable shapes. The recommended level for most attics is to insulate to r 38 or about 10 to 14 inches depending on insulation type. In the baltimore area the u s. They range from around 1 to 3 inches in thickness and can be used in multiple applications ranging from walls to attics.

Add the right kind of insulation when adding additional insulation you do not have to use the same type of insulation that currently exists in your attic. These insulation levels will keep heated air from migrating out in winter. 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. The most common form that insulation comes in is a batt or blanket.

They come with or without a paper or foil facing that acts as a vapor barrier. Different types of insulation take up different amounts of space to insulate effectively. Typically houses in warm weather states should have an r 38 insulation in the attic whereas houses in cold climates should have r 49. Typical fiberglass batt insulation has an r value between 2 9 and 3 8 per inch of thickness.

There are three common attic insulation types used today. First things first you need to go up into your attic inspect the condition of the insulation and calculate the current level of insulation.