Exterior Wall R Value Insulation Chart

Achieving greater r values in attics.

Exterior wall r value insulation chart.

Depending on where you live and the part of your home you re insulating walls crawlspace attic etc you ll need a different r value. Buy 80 or more 8 78. R value insulation chart 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. Additional r value for a masonry wall constructed using these materials needs to add the insulating value of additional wall components typically included such as 1 solid foam polyisocyanurate r 8 extruded polystyrene r 5 expanded polystyrene r 4 or 1 of perlite r 2 7 and for an exterior air film winter no wind r 0 17 an interior.

Get free shipping on qualified 2x4 wall insulation or buy online pick up in store today in the building materials department. Let me explain when the general public hears an r 13 wall insulation they believe that in fact they have an r 13 insulation value in their exterior walls. View the owens corning exterior insulation 10 98 10 98. R value is a standard unit of measurement for determining among many things how effective your insulation will be.

U factor is a measure of a component assembly in its conductive and radiate capacities. 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. Recommended home insulation r values. What is the difference.

The r refers to absolute thermal resistance. Typical recommendations for exterior walls are r 13 to r 23 while r 30 r 38 and r 49 are common for ceilings and attic spaces. Select 2 to 4 items to compare. R value is a measure of insulation s ability to resist heat traveling through it.

Try the r value calculator available through oak ridge. The table below shows what levels of insulation are cost effective for different climates and. Higher r value numbers mean that the insulating material resists the cold or heat from the outside better. For example insulation that is compressed will not provide its full rated r value.

The overall r value of a wall or ceiling will be somewhat different from the r value of the insulation itself because heat flows more readily through studs joists and other building materials in a phenomenon known as thermal bridging. R value actually stands for resistive value. Whenever exterior siding is removed from an uninsulated wood frame wall drill holes in the sheathing and blow insulation into the empty wall cavity before installing the new siding. The higher the r value the better the thermal performance of the insulation.

Insulation level are specified by r value.