Residents of southern and central texas should insulate their attics to at least r 30 or about 9 5 inches of conventional fiberglass batt insulation.
Insulation value for attic required in texas.
First things first you need to go up into your attic inspect the condition of the insulation and calculate the current level of insulation.
R value is a measure of insulation s ability to resist heat traveling through it.
Special insulation exceptions related to ceilings with attic spaces ceilings without attic spaces masonry veneer and thermally isolated sunrooms are set forth in iecc section.
For diy attic insulation you ve got two choices.
Dallas texas falls in climate zone three where attics are recommended to have an r value between 38 49 this means a minimum of 12 of insulation.
Yes generally a higher r value means a more effective insulator but the highest r value possible may not be necessarily right for your project.
The table below shows what levels of insulation are cost effective for different climates and.
Each bag lists the required depths for a range of r values and the number of bags needed to cover 1 000 square feet at those depths.
Inspecting your attic insulation.
Blown fiberglass attic insulation has an r value of 2 2 per inch so 12 inches of it would give you an r value of 26 4 in your attic installation project.
Insulation ratings can be improved by adding more layers of insulation.
The required slab edge r values for heated slabs.
The ideal attic insulation r value is different than the ideal wall insulation r value.
What r value is best for my home.
Make sure your home is properly insulated in all these locations.
For bigger jobs such as roof attic floor and wall insulation you will need professional help and equipment.
Insulation level are specified by r value.
Loose fill or batt the common term for blanket insulation.
For loose fill read labels.
Diyers can use this foam for small jobs such as insulating door frames.
Measure your attic s square footage.
Insulation depth shall be the depth of the footing or 2 feet whichever is less in climate zones 2 3 for heated slabs.
Uninsulated attic spaces are responsible for significant heat loss since heat rises in a building.
You can mix the type and material of insulation too.
Achieving greater r values in attics.
For batts or rolls calculate.
If you live in the texas panhandle consider increasing your insulation level to at least r 38.
The open cell polyurethane foam has an r value of 3 5 to 3 6 per inch with a price tag of 1 1 20 square foot.
