Insulation Value For Nc Attic Insulation

The table below shows what levels of insulation are cost effective for different climates and locations in the home.

Insulation value for nc attic insulation.

R 15 on exterior walls. The r value depends on the type of insulation its thickness and its density. Does your home have enough r value. 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.

According to home advisor insulating your attic can cost between 1700 to 2100. 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. 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 higher the r value the better the thermal performance of the insulation. Houses in a cold climate should have a minimum of r 49 in the attic which is equivalent to approximately 16 of fiberglass insulation. Wake county is 4a zone so walls floors ceilings and slab insulation values are unchanged from the 2012 code. The main factors that impact the cost are.

R 38 for the ceiling attic. Type and material of your insulation. Contractor or insulation installer s fee. Insulation level are specified by r value.

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. 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. The prescriptive r values for a new house in the new 2018 nc building code are as follows. R 19 on floor system garage ceiling.

R value is a measure of insulation s ability to resist heat traveling through it. Floors over unheated spaces need to be insulated to a minimum of r 19 in zones 3 and 4. 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. Warmer climates only require an r 38 or higher or about 12 or more.

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.