Insulation Value For Nc Attic Insulation

These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation.

Insulation value for nc attic insulation.

For example if you have a type of insulation that has an r value of r 5 per inch of thickness you will need a depth of 6 inches of this insulation installed in your attic to reach r 30 if you live in zones 2 or 3. Injection foam insulation s higher r value. The main factors that impact the cost are. Floors over unheated spaces need to be insulated to a minimum of r 19 in zones 3 and 4.

Type and material of your insulation. Insulation level are specified by r value. R 38 for the ceiling attic. Square footage of your attic.

If you think you re among the 90 of us homes that are under insulated 1 performing a simple insulation inspection will help you determine your insulation needs. The higher the r value the better the thermal performance of the insulation. According to home advisor insulating your attic can cost between 1700 to 2100. Typical recommendations for exterior walls are r 13 to r 23 while r 30 r 38 and r 49 are common for ceilings and attic spaces.

The prescriptive r values for a new house in the new 2018 nc building code are as follows. The r value depends on the type of insulation its thickness and its density. R 15 on exterior walls. The table below shows what levels of insulation are cost effective for different climates and locations in the home.

Contractor or insulation installer s fee. R 19 on floor system garage ceiling. Warmer climates only require an r 38 or higher or about 12 or more. Attic insulation in raleigh nc an insulating material s resistance to conductive heat flow is measured or rated in terms of its thermal resistance or r value the higher the r value the greater the insulating effectiveness.

Injection foam insulation stops air leakage. R value is a measure of insulation s ability to resist heat traveling through it. With an r value of 4 0 to 5 1 per inch depending on the manufacturer pre expanded injection foam provides a higher r value than fiberglass or cellulose and it seals the building from air leakage at the same time. Houses in a cold climate should have a minimum of r 49 in the attic which is equivalent to approximately 16 of fiberglass insulation.

Walls need to be insulated to a minimum of r 20 if the insulation is between the studs or r 15 r 5 if the insulation is a combination of insulation between the studs and a continuous layer of exterior insulation in zones 3 or 4. Does your home have enough r value.