How to Find the R-Value of a Wall for Home Insulation

Video Transcript

"Hi! My name is Joshua Lindsey with CFM Building Science Solutions. On behalf of Expert Village, we are doing a frame walk and insulation on this home. So what I want to talk about here for a minute is the working R-Value of a wall. What I mean by working is we have right here, this is a 2x4, where you can see three and half inches thick. A 2x4 is about an 1 R-Value per square inch. So therefore, we are setting about an R-Value in this particular part of the wall. We are setting at an R-Value of three and half. Okay so we've got an R-Value of about three and half right here. We've got an R-Value or 13 right here and then three and half, R-13 three and half. The framing in your wall is going to consist of about 25 percent of that wall is going to be would. So you have to think about the fact that 25 percent of my wall is three and half and then we have our 13 right here. So the working R-Value obviously, the average is going to be dropped down. "