I'm thinking about upgrading the insulation in my exterior walls, and I'm curious about using a higher R-value. The building code in my area (northern Virginia) requires a minimum of R-15 and recommends R-19, but since my walls are 2x6 framed, I could fit in R-23 rock wool batt insulation. Aside from the higher initial cost, are there any downsides to going with a higher R-value than what's required? Also, how does this decision affect insulation in other areas like the ceilings and attic?
1 Answer
As long as you're not going to extreme levels like R-60 in your walls, there's really no downside to adding more insulation. It generally helps with energy efficiency and comfort. Just check that it doesn't create any moisture issues. In cases where other areas (like ceilings) aren't as insulated, you'll still benefit from the added wall insulation, though ideally, everything should work together for best results.
That's good to know! So, even if the ceiling isn't super insulated yet, I can still gain something by beefing up the walls?