Simple previous fiberglass may not be pretty much as good as rock wool in that perception. I'd personally go ahead and take Roxul men assistance and set up flush to subfloor, the joists may even be tall sufficient for any next layer of batts. We use these cookies to help https://safety-standards36813.mybuzzblog.com/12111430/how-much-you-need-to-expect-you-ll-pay-for-a-good-thermal-performance