Cellulose Wall Insulation R Value

Try the r value calculator available through oak ridge.

Cellulose wall insulation r value.

R value is a standard unit of measurement for determining among many things how effective your insulation will be. When walls are already finished injecting loose fill cellulose insulation is one of the few ways of adding. The common standard by which insulation is measured r value is the level of resistance to heat flow. The higher the r value the better the thermal performance of the insulation.

Loose fill cellulose is relatively inexpensive yet still has an r value of about 3 5 per inch of thickness compared to fiberglass r value between r3 to r4 per inch. These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation. Once applied closed cell foams become rigid and have an r value range from r 6 to. R value measures conductive resistance.

The choices can be difficult to sift but cellulose insulation passes as a strong contender. R value is a measure of insulation s ability to resist heat traveling through it. Open cell and closed cell each with different characteristics. For example a wall with 3 fiberglass batting r value of 10 8 11 9 may have an overall r value of nearly 14 because of siding sheathing and drywall.

Higher r value numbers mean that the insulating material resists the cold or heat from the outside better. The table below shows what levels of insulation are cost effective for different climates and. Insulation materials come in many forms. The r value is a calculation which measures the flow of heat through an insulation product or its.

When cellulose is densely blown 3 0lbs ft3 or 48kg m3 or greater it is an excellent wall cavity insulation that provides a good r value at a reasonable cost. Basics of faced fiberglass insulation from r 13 to r 19. How to achieve r 21 in a 2x4 wall. Along with knowing the r value of a particular insulation it is also important to calculate the r value of a total system.

Find your zone on the map and then use the above insulation r value chart to determine the level of insulation you need to properly insulate your attic walls floors and crawlspaces. Open cell foam is soft and spongy impermeable to air but permeable to moisture and according to the doe has an r value per inch ranging from r 3 6 to r 4 3. The r refers to absolute thermal resistance. Insulation is rated in two ways r value and u value.

However it is seldom used in canada despite its reasonable cost and efficiency. Loose fill cellulose insulation can settle around and conform to most of the obstructions found in walls and attics. There are two main types of spray foam.