Find your zone on the map and then use the chart to determine the level of insulation you need to properly insulate your attic walls floors and crawlspaces.
Double insulation in attic.
In a cooling climate a good blanket of attic insulation helps keep the house cooler and reduces the load on air conditioning equipment.
Proper attic insulation is the best way to prevent heat loss in the winter and retain cool air in the summer.
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Achieving greater r values in attics the higher the r value the better the thermal performance of the insulation.
For diy attic insulation you ve got two choices.
Loose fill or batt the common term for blanket insulation.
In my attic i currently have usg thermafiber insulation in the 5 75 6 75 between joists with 9 unfaced fiberglass batts on top.
Improper installation can damage attic framing promote mold.
These insulation levels will keep heated air from migrating out in winter.
Both can be added to uninsulated attics or layered over existing material.
Typically houses in warm weather states should have an r 38 insulation in the attic whereas houses in cold climates should have r 49.
A tip for doubling up on attic insulation.