Little things can make a big difference! During a recent home inspection, I discovered significant frost build-up in the attic. What was the cause? The hatch cover to the attic was a 1/2 inch piece of plywood with no insulation above it.
A thermal image photo taken from below the hatch shows the stark contrast. Warm moist air is entering the attic, reducing the R-factor of the insulation, and could damage the ceiling when that frost build-up finally thaws. This is a cheap and easy fix with a small piece of insulation that comes with a huge payback.