Our calculators allow you to compute the R value (or U Factor) of your assembly. Ekotrope also offers full home modeling tools to industry professionals and universities to support IECC code compliance, LEED for Homes, ENERGY STAR, 45L, etc. If you are interested in home energy modeling beyond these free calculators, please reach out!
Wall R Value Calculator
Floor R Value Calculator
Roof R Value Calculator
Ekotrope offers our wall, floor, and roof calculators for free for you to try out. These are also found within Ekotrope RATER. Our calculators are based on the same methodology described by John Krigger & Chris Dorsi in their book Residential Energy, supplemented with material from both ASHRAE and RESNET.
Our calculators are great tools for quickly comparing different combinations of materials and their aggregate thermal performance. Thermal performance of walls and roofs is one aspect of home performance. To account for factors such as bulk air movement and air leaks in a wall or roof assembly, we recommend utilizing Ekotrope RATER for your energy modeling needs. To learn more about our tools or ask questions about our calculators, feel free to contact us today.
What is R-Value?
R-value, commonly used when describing walls, roofs, and similar housing components, measures how well building insulation can prevent the flow of heat into and out of the home. A higher R-value equates to greater insulation performance, and thus higher savings on heating and cooling.
What is U-Factor?
U-factor is the rate at which heat can transfer through a material, and is the inverse of the R-value. A high performance window tends to have lower u-factor, indicating that less heat can transfer through the window, while a higher u-factor indicates a higher degree of heat transfer.
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