Exterior Insulation R Value

Insulation ratings are measured in r values per inch of thickness.

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. Air gap or air film 3 4 air space insulating properties. The r 0 87 value for the first value in this air r value table subsection. Insulation r values vary based on the type thickness and density of the insulation material.

Product documentation download documents. 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. 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. U factor is a measure of a component assembly in its conductive and radiate capacities.

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. Does not consider internal convection effects. See the department of energy s doe ranges for recommended levels of insulation below. Along with knowing the r value of a particular insulation it is also important to calculate the r value of a total system.

The table below shows what levels of insulation are cost effective for different climates and locations in the home. 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. 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. Price list leed calculator r value calculator materials calculator bim model downloads.

The higher the r value the better the thermal performance of the insulation. An r value tells you how well a type of insulation can keep heat from leaving or entering your home. Typically a higher insulation r rating means better climate control and better energy efficiency for your home. R value is a measure of insulation s ability to resist heat traveling through it.

As a benchmark one inch of solid wood has an r value of 1. 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. Does not consider presence absence of reflective barriers.