Insulation Value For Nc Attic 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.

Insulation value for nc attic insulation. The prescriptive r values for a new house in the new 2018 nc building code are as follows. The higher the r value the better the thermal performance of the insulation. Injection foam insulation stops air leakage. 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.

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. According to home advisor insulating your attic can cost between 1700 to 2100. The main factors that impact the cost are.

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. R 38 for the ceiling attic. The table below shows what levels of insulation are cost effective for different climates and locations in the home. 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. 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. R 15 on exterior walls. 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.

Type and material of your insulation. The r value depends on the type of insulation its thickness and its density. Warmer climates only require an r 38 or higher or about 12 or more. R 19 on floor system garage ceiling.

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. Contractor or insulation installer s fee. 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. Insulation level are specified by r value.

Square footage of your attic. Injection foam insulation s higher r value.