Cellulose Wall Insulation R Value

Try the r value calculator available through oak ridge.

Cellulose wall insulation r value.

The r value is a calculation which measures the flow of heat through an insulation product or its. Loose fill cellulose insulation can settle around and conform to most of the obstructions found in walls and attics. However it is seldom used in canada despite its reasonable cost and efficiency. Insulation is rated in two ways r value and u value.

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. Insulation level are specified by r value. There are two main types of spray foam. 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.

The common standard by which insulation is measured r value is the level of resistance to heat flow. The r refers to absolute thermal resistance. R value measures conductive resistance. R value is a standard unit of measurement for determining among many things how effective your insulation will be.

Higher r value numbers mean that the insulating material resists the cold or heat from the outside better. Open cell and closed cell each with different characteristics. When walls are already finished injecting loose fill cellulose insulation is one of the few ways of adding. 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.

Along with knowing the r value of a particular insulation it is also important to calculate the r value of a total system. Insulation materials come in many forms. 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. These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation.

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. The table below shows what levels of insulation are cost effective for different climates and. Once applied closed cell foams become rigid and have an r value range from r 6 to. They are sprayed stapled blown nailed or simply laid in place.

How to achieve r 21 in a 2x4 wall. The higher the r value the better the thermal performance of the insulation. The choices can be difficult to sift but cellulose insulation passes as a strong contender.