Existing 3 4 inches of insulation.
Insulation value for nc attic insulation.
First things first you need to go up into your attic inspect the condition of the insulation and calculate the current level of insulation.
R 19 on floor system garage ceiling.
Wake county is 4a zone so walls floors ceilings and slab insulation values are unchanged from the 2012 code.
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.
R 15 on exterior walls.
Find your zone on the map and then use the chart to determine the level of insulation you need to properly insulate your attic walls floors and crawlspaces.
Recommended insulation levels for retrofitting existing wood framed buildings.
Your attic should have a certain amount of insulation in it and the recommended level of insulation for your attic is dependent on where you live.
The prescriptive r values for a new house in the new 2018 nc building code are as follows.
Inspecting your attic insulation.
The main factors that impact the cost are.
R 38 for the ceiling attic.
Type and material of your insulation.
Add insulation to attic.
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.
According to home advisor insulating your attic can cost between 1700 to 2100.
Warmer climates only require an r 38 or higher or about 12 or more.
Many homes have no insulation at all because building codes didn t even require insulation prior to the mid 1970 s.
R value climate zone chart for wall attics and floors.
Contractor or insulation installer s fee.
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.
Almost all insulation products have to tell you their r value pipe and duct insulation are the only exceptions.
All new construction in the usa and canada today must meet certain minimum r values depending on what climate area of the country you live in.