Exterior Insulation R Value

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.

Exterior insulation r value.

In comparison an inch of blown fiberglass insulation has an r value of 3 1 3 4 and an inch of blown cellulose in an attic has an r value of 3 2 3 7. Insulation ratings are measured in r values per inch of thickness. Typically a higher insulation r rating means better climate control and better energy efficiency for your home. U factor is a measure of a component assembly in its conductive and radiate capacities.

Along with knowing the r value of a particular insulation it is also important to calculate the r value of a total system. Insulation r values vary based on the type thickness and density of the insulation material. Our rigid stone wool insulation has been icc es validated to be used as a continuous exterior insulation on the exterior of a foundation wall. As a benchmark one inch of solid wood has an r value of 1.

Air gap or air film 3 4 air space insulating properties. Insulation level are specified by r value. The table below shows what levels of insulation are cost effective for different climates and locations in the home. 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.

R value is a measure of insulation s ability to resist heat traveling through it. Also included is the hugely helpful insulation zip code calculator that spells out the suggested amount of r value necessary for the different portions of a structure like foundation interior and exterior walls attic and more. An r value tells you how well a type of insulation can keep heat from leaving or entering your home. The higher the r value the better the thermal performance of the insulation.

See the department of energy s doe ranges for recommended levels of insulation below. Does not consider presence absence of reflective barriers. Product documentation download documents. Does not consider internal convection effects.

The truth is this studs have an r value of 3 5. 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. 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.