Putting R30 In An Attic

Existing 3 4 inches of insulation.

Putting r30 in an attic.

Make sure you use an unfaced batt one without a paper or foil layer so the insulation does not trap moisture in the ceiling. Achieving greater r values in attics the higher the r value the better the thermal performance of the insulation. Now that you ve air sealed your attic and basement check your attic insulation levels and add more if necessary. Here s how to use 3 layers of 2 inch polyiso foam board to meet code and keep your ne.

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. I installed r30 rock wool batts in my rafter bays with a vented roof and conditioned attic space. Better than spray foam thermal break and relatively consistent r 30. Now here s a situation where a homeowner what looks like many years ago added insulation they added a three inch layer but.

I would highly recommend a vented roof if you plan to use a metal through fastener roof like r or u panel which is extremely common in texas. Wear a long sleeve shirt gloves eye protection and a dust mask. Add insulation to attic. For loose fill cellulose this translates to a total depth ranging from 8 inches.

In temperate coastal areas such as zone 3 attic insulation of at least r30 up to a maximum of r60 is recommended. Lay the batts perpendicular to the joists so they do not compress the insulation below.