Insulation Value For Nc Attic Insulation

Injection foam insulation s higher r value.

Insulation value for nc attic insulation.

The main factors that impact the cost are. Does your home have enough r value. 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. 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 level are specified by r value. Injection foam insulation stops air leakage. 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 value is a measure of insulation s ability to resist heat traveling through it.

Warmer climates only require an r 38 or higher or about 12 or more. Wake county is 4a zone so walls floors ceilings and slab insulation values are unchanged from the 2012 code. Contractor or insulation installer s fee. The r value depends on the type of insulation its thickness and its density.

R 38 for the ceiling attic. Floors over unheated spaces need to be insulated to a minimum of r 19 in zones 3 and 4. The prescriptive r values for a new house in the new 2018 nc building code are as follows. 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.

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

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

Houses in a cold climate should have a minimum of r 49 in the attic which is equivalent to approximately 16 of fiberglass insulation. According to home advisor insulating your attic can cost between 1700 to 2100.