Insulation Value For Nc Attic Insulation

R 15 on exterior walls.

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. Houses in a cold climate should have a minimum of r 49 in the attic which is equivalent to approximately 16 of fiberglass insulation. The main factors that impact the cost are. Warmer climates only require an r 38 or higher or about 12 or more.

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. Contractor or insulation installer s fee. 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.

The prescriptive r values for a new house in the new 2018 nc building code are as follows. R 38 for the ceiling attic. R 19 on floor system garage ceiling. R value is a measure of insulation s ability to resist heat traveling through it.

Injection foam insulation stops air leakage. Injection foam insulation s higher r value. Insulation level are specified by 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.

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. The r value depends on the type of insulation its thickness and its density. According to home advisor insulating your attic can cost between 1700 to 2100. 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.

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. The higher the r value the better the thermal performance of the insulation. 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. Square footage of your attic.

Wake county is 4a zone so walls floors ceilings and slab insulation values are unchanged from the 2012 code. 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.