Wall Insulation U Values

Insulation r values vary based on the type thickness and density of the insulation material.

Wall insulation u values.

U value has an inverse relationship to r value. For example a building with material with an r value of r 11 converts to an u value of 0 09 1 r or 1 11 0 09. The saint gobain insulation uk online u value calculator covers a variety of different insulation applications. The map and chart show each region of the u s the subsequent zones and corresponding r values.

Add r5 to r6 insulative wall sheathing beneath the new siding. Recommended home insulation r values. We provide u value calculations to show compliance with current building regulations standards and best practice. K value of the 3 1 2 inch wide wood studs.

An r value tells you how well a type of insulation can keep heat from leaving or entering your home. Add r5 insulative wall sheathing beneath the new siding. K value of the 3 8 inch gypsum wall board. Obviously the insulation material will improve the u value.

These can be supported with a detailed report. The calculation of the wall s u value is sufficiently complex to be beyond the scope of this article but the following values must be known or at least estimated for its thermal transmittance to be calculated. The higher the r value the better the thermal performance of the insulation. In the context of building and construction the r value is a measure of how well a two dimensional barrier such as a layer of insulation a window or a complete wall or ceiling resists the conductive flow of heat.

Specify your desired u value before immediately calculating the required insulation thickness and product selection. Insulation ratings are measured in r values per inch of thickness. R value is a measure of insulation s ability to resist heat traveling through it. 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.

R value is the temperature difference per unit of heat flux needed to sustain one unit of heat flux between the warmer surface and colder surface of a barrier under steady state. Drill holes in the sheathing and blow insulation into the empty wall cavity before installing the new siding and. The table below shows what levels of insulation are cost effective for different climates and. Insulation level are specified by r value.

Whenever exterior siding is removed on an uninsulated wood frame wall. The best currently available is the val u therm system available from scotframe with a u value of 0 09w m2k from a wall thickness of 235mm plus the outer skin. Work through your own construction detail to get an early indication of the u value that this might achieve. Reference table for u values u value is the coefficient of transmission i e the transmission of heat through the materials which compose the building s envelope or outer shell.

For more information see our articles and how to videos below.