Insulation Value For Nc Attic Insulation

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.

Insulation value for nc attic insulation.

Does your home have enough r value. These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation. Injection foam insulation s higher r value. Floors over unheated spaces need to be insulated to a minimum of r 19 in zones 3 and 4.

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. Depending on where you live and the part of your home you re insulating walls crawlspace attic etc you ll need a different r value.

Insulation level are specified by r value. 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. R 19 on floor system garage ceiling. R 15 on exterior walls.

Type and material of your insulation. Having the correct amount of attic insulation can help you maintain a comfortable temperature throughout your home and help save money on your energy bills plus prevent major issues like ice dams in the winter. 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. R 38 for the ceiling attic.

The higher the r value the better the thermal performance of the insulation. Square footage of your attic. Houses in a cold climate should have a minimum of r 49 in the attic which is equivalent to approximately 16 of fiberglass insulation. Injection foam insulation stops air leakage.

Contractor or insulation installer s fee. R value is a measure of insulation s ability to resist heat traveling through it. 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. 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.

The table below shows what levels of insulation are cost effective for different climates and locations in the home. Warmer climates only require an r 38 or higher or about 12 or more.