Standard Roof Insulation Thickness

For your home s insulation to be properly compliant the building envelope must be constructed so that it satisfies.

Standard roof insulation thickness.

The manufacturer s specifications to ensure that the product performs as tested. Standard test methods for testing cellular glass insulation. Some types of thicker foam board insulation are available but they may need to be special ordered. If you think you re among the 90 of us homes that are under insulated 1 performing a simple insulation inspection will help you determine your insulation needs.

Part 3 12 of the building code of australia housing provisions bca as nzs 4859 1 materials for the thermal insulation of buildings. The table below shows what levels of insulation are cost effective for different climates and locations in the home. See the department of energy s doe ranges for recommended levels of insulation below. It comes in standard size 4 8 sheets and smaller sizes in many different thicknesses from 1 4 inch to 2 inches.

Based on the doe recommendations you can expect regular batt insulation to have an approximate value between r 2 9 and r 3 8 per inch of the material s thickness. Having the correct amount of attic insulation can help you maintain a comfortable temperature throughout your home and help save money on your energy bills plus prevent major issues like ice dams in the winter. Achieving a u value of 0 20w m meaning your roof will be better insulated than your walls will need 120mm thickness of rigid foam or 200mm of mineral wool or natural insulation. For every type and material of insulation check the r value per inch of thickness that the manufacturer has listed.

R value is a measure of insulation s ability to resist heat traveling through it. Standard test methods for cellulosic fiber insulating board. C203 05a 2017 standard test methods for breaking load and flexural properties of block type thermal insulation. The importance of insulation thickness r value isn t just a time measurement though.

It takes into account the size of the sample and the overall change of temperature over time so that you can compare thermal conductivity of materials tested with plates of different temperatures or even that were tested by other methods. Foam board insulation is easy to use and is a great diy way to add some insulation. In general the insulation s method of installation can give you an idea of how it compares to other types of insulation. 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.

The higher the r value the better the thermal performance of the insulation. Standard test methods for thickness and density of blanket or batt thermal insulations. Insulation level are specified by r value.