What R-value means
R-value measures how well insulation resists heat flow. Bigger number, better resistance. That is all it is.
Different materials hit the same R-value at different depths. Fiberglass needs more inches than foam for the same R. Depth and material work together.
What our area calls for
Federal guidance suggests R-38 to R-60 for attics in our part of Maryland. For blown cellulose or fiberglass, that means roughly 10 to 16 inches of even cover.
Most homes we inspect sit at R-19 or less. Some are near zero. The gap between what is there and what should be there is your opportunity.
How to check yours
Grab a ruler and a flashlight. Go to the attic hatch. Measure the insulation depth in a few spots. If you see wood joists, you are well short.
Note the type too. Flat gray batts from decades ago do less than their label says. Age and compression steal R-value.
More is not always better
Going from R-11 to R-38 is a huge jump. Going from R-38 to R-60 is a smaller one. Each extra inch adds less than the last. We tell you where the sweet spot is for your home.
Depth is not everything
A foot of insulation over open air leaks still leaks. Seal first, then fill. The R-value only counts when the air stays put.
Vents matter too. Insulation needs air flow above it to stay dry. We check your vents as part of every job.
Call (301) 679-9193 for a free attic inspection.