Why your attic insulation might be doing more harm than good
In short: General contractor Tom Silva demonstrates how to properly insulate an attic floor to improve home efficiency. Learn the critical difference between insulation types and how to avoid common moisture traps that lead to mold.
When insulating an attic floor, the choice of material matters. Tom Silva advises using unfaced fiberglass insulation, as faced versions contain a vapor barrier that can trap moisture, potentially causing mold in both the attic floor and the ceiling below. For those looking to increase coverage, cellulose insulation can be applied using a rented blower; it should be installed to a height above the floor joists to account for future settlement.
If your attic floor is already covered, Silva suggests installing a layer of rigid foam topped with 3/4-inch plywood. This method provides both added insulation and a functional surface for storage. These materials are readily available at home centers for homeowners tackling smaller improvement projects.
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Sources
- Summary by Intellect · source: How to Maximize the Impact of Insulation | Ask This Old House
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